v0.0.163

.idea/goext.iml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="WEB_MODULE" version="4">
-  <component name="Go" enabled="true" />
+  <component name="Go" enabled="true">
+    <buildTags>
+      <option name="goVersion" value="1.19" />
+    </buildTags>
+  </component>
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$" />
     <orderEntry type="inheritedJdk" />

Makefile

@@ -3,7 +3,9 @@ run:
 	echo "This is a library - can't be run" && false
 
 test:
-	go test ./...
+	# go test ./...
+	which gotestsum || go install gotest.tools/gotestsum@latest
+	gotestsum --format "testname" -- -tags="timetzdata sqlite_fts5 sqlite_foreign_keys" "./test"
 
 version:
 	_data/version.sh

README.md

@@ -6,3 +6,36 @@ A collection of general & useful library methods
 This should not have any heavy dependencies (gin, mongo, etc) and add missing basic language features...
 
 Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
+
+
+### Packages:
+
+| Name         | Maintainer | Description                                                                                                   |
+|--------------|------------|---------------------------------------------------------------------------------------------------------------|
+| langext      | Mike       | General uttility/helper functions, (everything thats missing from go standard library)                        |
+| mathext      | Mike       | Utility/Helper functions for math                                                                             |
+| cryptext     | Mike       | Utility/Helper functions for encryption                                                                       |
+| syncext      | Mike       | Utility/Helper funtions for multi-threading / mutex / channels                                                |
+| dataext      | Mike       | Various useful data structures                                                                                |
+| zipext       | Mike       | Utility for zip/gzip/tar etc                                                                                  |
+| reflectext   | Mike       | Utility for golagn reflection                                                                                 |
+|              |            |                                                                                                               |
+| mongoext     | Mike       | Utility/Helper functions for mongodb                                                                          |
+| cursortoken  | Mike       | MongoDB cursortoken implementation                                                                            |
+|              |            |                                                                                                               |
+| totpext      | Mike       | Implementation of TOTP (2-Factor-Auth)                                                                        |
+| termext      | Mike       | Utilities for terminals (mostly color output)                                                                 |
+| confext      | Mike       | Parses environment configuration into structs                                                                 |
+| cmdext       | Mike       | Runner for external commands/processes                                                                        |
+|              |            |                                                                                                               |
+| sq           | Mike       | Utility functions for sql based databases                                                                     |
+| tst          | Mike       | Utility functions for unit tests                                                                              |
+|              |            |                                                                                                               |
+| rfctime      | Mike       | Classes for time seriallization, with different marshallign method for mongo and json                         |
+| gojson       | Mike       | Same interface for marshalling/unmarshalling as go/json, except with proper serialization of null arrays/maps |
+|              |            |                                                                                                               |
+| bfcodegen    | Mike       | Various codegen tools (run via go generate)                                                                   |
+|              |            |                                                                                                               |
+| rext         | Mike       | Regex Wrapper, wraps regexp with a better interface                                                           |
+| wmo          | Mike       | Mongo Wrapper, wraps mongodb with a better interface                                                          |
+|              |            |                                                                                                               |

TODO.md

@@ -0,0 +1,13 @@
+
+
+ - cronext
+
+ - cursortoken
+
+ - typed/geenric mongo wrapper
+
+ - error package
+
+- rfctime.DateOnly
+- rfctime.HMSTimeOnly
+- rfctime.NanoTimeOnly

_data/version.sh

@@ -23,6 +23,8 @@ fi
 
 git pull --ff
 
+go get -u ./...
+
 curr_vers=$(git describe --tags --abbrev=0 | sed 's/v//g')
 
 next_ver=$(echo "$curr_vers" | awk -F. -v OFS=. 'NF==1{print ++$NF}; NF>1{if(length($NF+1)>length($NF))$(NF-1)++; $NF=sprintf("%0*d", length($NF), ($NF+1)%(10^length($NF))); print}')
@@ -32,6 +34,8 @@ echo "> Current Version: ${curr_vers}"
 echo "> Next    Version: ${next_ver}"
 echo ""
 
+printf "package goext\n\nconst GoextVersion = \"%s\"\n\nconst GoextVersionTimestamp = \"%s\"\n" "${next_ver}" "$( date +"%Y-%m-%dT%H:%M:%S%z" )" > "goextVersion.go"
+
 git add --verbose .
 
 msg="v${next_ver}"

bfcodegen/enum-generate.go

@@ -0,0 +1,364 @@
+package bfcodegen
+
+import (
+	"errors"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext"
+	"gogs.mikescher.com/BlackForestBytes/goext/cmdext"
+	"gogs.mikescher.com/BlackForestBytes/goext/cryptext"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"gogs.mikescher.com/BlackForestBytes/goext/rext"
+	"io"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"time"
+)
+
+type EnumDefVal struct {
+	VarName     string
+	Value       string
+	Description *string
+}
+
+type EnumDef struct {
+	File         string
+	FileRelative string
+	EnumTypeName string
+	Type         string
+	Values       []EnumDefVal
+}
+
+var rexPackage = rext.W(regexp.MustCompile("^package\\s+(?P<name>[A-Za-z0-9_]+)\\s*$"))
+
+var rexEnumDef = rext.W(regexp.MustCompile("^\\s*type\\s+(?P<name>[A-Za-z0-9_]+)\\s+(?P<type>[A-Za-z0-9_]+)\\s*//\\s*(@enum:type).*$"))
+
+var rexValueDef = rext.W(regexp.MustCompile("^\\s*(?P<name>[A-Za-z0-9_]+)\\s+(?P<type>[A-Za-z0-9_]+)\\s*=\\s*(?P<value>(\"[A-Za-z0-9_:]+\"|[0-9]+))\\s*(//(?P<descr>.*))?.*$"))
+
+var rexChecksumConst = rext.W(regexp.MustCompile("const ChecksumGenerator = \"(?P<cs>[A-Za-z0-9_]*)\""))
+
+func GenerateEnumSpecs(sourceDir string, destFile string) error {
+
+	files, err := os.ReadDir(sourceDir)
+	if err != nil {
+		return err
+	}
+
+	oldChecksum := "N/A"
+	if _, err := os.Stat(destFile); !os.IsNotExist(err) {
+		content, err := os.ReadFile(destFile)
+		if err != nil {
+			return err
+		}
+		if m, ok := rexChecksumConst.MatchFirst(string(content)); ok {
+			oldChecksum = m.GroupByName("cs").Value()
+		}
+	}
+
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return v.Name() != path.Base(destFile) })
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return strings.HasSuffix(v.Name(), ".go") })
+	langext.SortBy(files, func(v os.DirEntry) string { return v.Name() })
+
+	newChecksumStr := goext.GoextVersion
+	for _, f := range files {
+		content, err := os.ReadFile(path.Join(sourceDir, f.Name()))
+		if err != nil {
+			return err
+		}
+		newChecksumStr += "\n" + f.Name() + "\t" + cryptext.BytesSha256(content)
+	}
+
+	newChecksum := cryptext.BytesSha256([]byte(newChecksumStr))
+
+	if newChecksum != oldChecksum {
+		fmt.Printf("[EnumGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
+	} else {
+		fmt.Printf("[EnumGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
+		return nil
+	}
+
+	allEnums := make([]EnumDef, 0)
+
+	pkgname := ""
+
+	for _, f := range files {
+		fmt.Printf("========= %s =========\n\n", f.Name())
+		fileEnums, pn, err := processFile(sourceDir, path.Join(sourceDir, f.Name()))
+		if err != nil {
+			return err
+		}
+
+		fmt.Printf("\n")
+
+		allEnums = append(allEnums, fileEnums...)
+
+		if pn != "" {
+			pkgname = pn
+		}
+	}
+
+	if pkgname == "" {
+		return errors.New("no package name found in any file")
+	}
+
+	err = os.WriteFile(destFile, []byte(fmtOutput(newChecksum, allEnums, pkgname)), 0o755)
+	if err != nil {
+		return err
+	}
+
+	res, err := cmdext.RunCommand("go", []string{"fmt", destFile}, langext.Ptr(2*time.Second))
+	if err != nil {
+		return err
+	}
+
+	if res.CommandTimedOut {
+		fmt.Println(res.StdCombined)
+		return errors.New("go fmt timed out")
+	}
+	if res.ExitCode != 0 {
+		fmt.Println(res.StdCombined)
+		return errors.New("go fmt did not succeed")
+	}
+
+	return nil
+}
+
+func processFile(basedir string, fn string) ([]EnumDef, string, error) {
+	file, err := os.Open(fn)
+	if err != nil {
+		return nil, "", err
+	}
+
+	defer func() { _ = file.Close() }()
+
+	bin, err := io.ReadAll(file)
+	if err != nil {
+		return nil, "", err
+	}
+
+	lines := strings.Split(string(bin), "\n")
+
+	enums := make([]EnumDef, 0)
+
+	pkgname := ""
+
+	for i, line := range lines {
+		if i == 0 && strings.HasPrefix(line, "// Code generated by") {
+			break
+		}
+
+		if match, ok := rexPackage.MatchFirst(line); i == 0 && ok {
+			pkgname = match.GroupByName("name").Value()
+			continue
+		}
+
+		if match, ok := rexEnumDef.MatchFirst(line); ok {
+
+			rfp, err := filepath.Rel(basedir, fn)
+			if err != nil {
+				return nil, "", err
+			}
+
+			def := EnumDef{
+				File:         fn,
+				FileRelative: rfp,
+				EnumTypeName: match.GroupByName("name").Value(),
+				Type:         match.GroupByName("type").Value(),
+				Values:       make([]EnumDefVal, 0),
+			}
+			enums = append(enums, def)
+			fmt.Printf("Found enum definition { '%s' -> '%s' }\n", def.EnumTypeName, def.Type)
+		}
+
+		if match, ok := rexValueDef.MatchFirst(line); ok {
+			typename := match.GroupByName("type").Value()
+			def := EnumDefVal{
+				VarName:     match.GroupByName("name").Value(),
+				Value:       match.GroupByName("value").Value(),
+				Description: match.GroupByNameOrEmpty("descr").ValueOrNil(),
+			}
+
+			found := false
+			for i, v := range enums {
+				if v.EnumTypeName == typename {
+					enums[i].Values = append(enums[i].Values, def)
+					found = true
+					if def.Description != nil {
+						fmt.Printf("Found enum value [%s] for '%s'  ('%s')\n", def.Value, def.VarName, *def.Description)
+					} else {
+						fmt.Printf("Found enum value [%s] for '%s'\n", def.Value, def.VarName)
+					}
+					break
+				}
+			}
+			if !found {
+				fmt.Printf("Found non-enum value [%s] for '%s' ( looks like enum value, but no matching @enum:type )\n", def.Value, def.VarName)
+			}
+		}
+	}
+
+	return enums, pkgname, nil
+}
+
+func fmtOutput(cs string, enums []EnumDef, pkgname string) string {
+	str := "// Code generated by enum-generate.go DO NOT EDIT.\n"
+	str += "\n"
+	str += "package " + pkgname + "\n"
+	str += "\n"
+
+	str += "import \"gogs.mikescher.com/BlackForestBytes/goext/langext\"" + "\n"
+	str += "\n"
+
+	str += "const ChecksumGenerator = \"" + cs + "\"" + "\n"
+	str += "\n"
+
+	str += "type Enum interface {" + "\n"
+	str += "    Valid() bool" + "\n"
+	str += "    ValuesAny() []any" + "\n"
+	str += "    ValuesMeta() []EnumMetaValue" + "\n"
+	str += "    VarName() string" + "\n"
+	str += "}" + "\n"
+	str += "" + "\n"
+
+	str += "type StringEnum interface {" + "\n"
+	str += "    Enum" + "\n"
+	str += "    String() string" + "\n"
+	str += "}" + "\n"
+	str += "" + "\n"
+
+	str += "type DescriptionEnum interface {" + "\n"
+	str += "    Enum" + "\n"
+	str += "    Description() string" + "\n"
+	str += "}" + "\n"
+	str += "\n"
+
+	str += "type EnumMetaValue struct {" + "\n"
+	str += "    VarName     string  `json:\"varName\"`" + "\n"
+	str += "    Value       any     `json:\"value\"`" + "\n"
+	str += "    Description *string `json:\"description\"`" + "\n"
+	str += "}" + "\n"
+	str += "\n"
+
+	for _, enumdef := range enums {
+
+		hasDescr := langext.ArrAll(enumdef.Values, func(val EnumDefVal) bool { return val.Description != nil })
+		hasStr := enumdef.Type == "string"
+
+		str += "// ================================ " + enumdef.EnumTypeName + " ================================" + "\n"
+		str += "//" + "\n"
+		str += "// File:       " + enumdef.FileRelative + "\n"
+		str += "// StringEnum: " + langext.Conditional(hasStr, "true", "false") + "\n"
+		str += "// DescrEnum:  " + langext.Conditional(hasDescr, "true", "false") + "\n"
+		str += "//" + "\n"
+		str += "" + "\n"
+
+		str += "var __" + enumdef.EnumTypeName + "Values = []" + enumdef.EnumTypeName + "{" + "\n"
+		for _, v := range enumdef.Values {
+			str += "    " + v.VarName + "," + "\n"
+		}
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		if hasDescr {
+			str += "var __" + enumdef.EnumTypeName + "Descriptions = map[" + enumdef.EnumTypeName + "]string{" + "\n"
+			for _, v := range enumdef.Values {
+				str += "    " + v.VarName + ": \"" + strings.TrimSpace(*v.Description) + "\"," + "\n"
+			}
+			str += "}" + "\n"
+			str += "" + "\n"
+		}
+
+		str += "var __" + enumdef.EnumTypeName + "Varnames = map[" + enumdef.EnumTypeName + "]string{" + "\n"
+		for _, v := range enumdef.Values {
+			str += "    " + v.VarName + ": \"" + v.VarName + "\"," + "\n"
+		}
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		str += "func (e " + enumdef.EnumTypeName + ") Valid() bool {" + "\n"
+		str += "    return langext.InArray(e, __" + enumdef.EnumTypeName + "Values)" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		str += "func (e " + enumdef.EnumTypeName + ") Values() []" + enumdef.EnumTypeName + " {" + "\n"
+		str += "    return __" + enumdef.EnumTypeName + "Values" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		str += "func (e " + enumdef.EnumTypeName + ") ValuesAny() []any {" + "\n"
+		str += "    return langext.ArrCastToAny(__" + enumdef.EnumTypeName + "Values)" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		str += "func (e " + enumdef.EnumTypeName + ") ValuesMeta() []EnumMetaValue {" + "\n"
+		str += "    return []EnumMetaValue{" + "\n"
+		for _, v := range enumdef.Values {
+			if hasDescr {
+				str += "        " + fmt.Sprintf("EnumMetaValue{VarName: \"%s\", Value: %s, Description: langext.Ptr(\"%s\")},", v.VarName, v.VarName, strings.TrimSpace(*v.Description)) + "\n"
+			} else {
+				str += "        " + fmt.Sprintf("EnumMetaValue{VarName: \"%s\", Value: %s, Description: nil},", v.VarName, v.VarName) + "\n"
+			}
+		}
+		str += "    }" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		if hasStr {
+			str += "func (e " + enumdef.EnumTypeName + ") String() string {" + "\n"
+			str += "    return string(e)" + "\n"
+			str += "}" + "\n"
+			str += "" + "\n"
+		}
+
+		if hasDescr {
+			str += "func (e " + enumdef.EnumTypeName + ") Description() string {" + "\n"
+			str += "    if d, ok := __" + enumdef.EnumTypeName + "Descriptions[e]; ok {" + "\n"
+			str += "        return d" + "\n"
+			str += "    }" + "\n"
+			str += "    return \"\"" + "\n"
+			str += "}" + "\n"
+			str += "" + "\n"
+		}
+
+		str += "func (e " + enumdef.EnumTypeName + ") VarName() string {" + "\n"
+		str += "    if d, ok := __" + enumdef.EnumTypeName + "Varnames[e]; ok {" + "\n"
+		str += "        return d" + "\n"
+		str += "    }" + "\n"
+		str += "    return \"\"" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		str += "func Parse" + enumdef.EnumTypeName + "(vv string) (" + enumdef.EnumTypeName + ", bool) {" + "\n"
+		str += "    for _, ev := range __" + enumdef.EnumTypeName + "Values {" + "\n"
+		str += "        if string(ev) == vv {" + "\n"
+		str += "            return ev, true" + "\n"
+		str += "        }" + "\n"
+		str += "    }" + "\n"
+		str += "    return \"\", false" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		str += "func " + enumdef.EnumTypeName + "Values() []" + enumdef.EnumTypeName + " {" + "\n"
+		str += "    return __" + enumdef.EnumTypeName + "Values" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+		str += "func " + enumdef.EnumTypeName + "ValuesMeta() []EnumMetaValue {" + "\n"
+		str += "    return []EnumMetaValue{" + "\n"
+		for _, v := range enumdef.Values {
+			if hasDescr {
+				str += "        " + fmt.Sprintf("EnumMetaValue{VarName: \"%s\", Value: %s, Description: langext.Ptr(\"%s\")},", v.VarName, v.VarName, strings.TrimSpace(*v.Description)) + "\n"
+			} else {
+				str += "        " + fmt.Sprintf("EnumMetaValue{VarName: \"%s\", Value: %s, Description: nil},", v.VarName, v.VarName) + "\n"
+			}
+		}
+		str += "    }" + "\n"
+		str += "}" + "\n"
+		str += "" + "\n"
+
+	}
+
+	return str
+}

bfcodegen/enum-generate_test.go

@@ -0,0 +1,15 @@
+package bfcodegen
+
+import (
+	"testing"
+)
+
+func TestApplyEnvOverridesSimple(t *testing.T) {
+
+	err := GenerateEnumSpecs("/home/mike/Code/reiff/badennet/bnet-backend/models", "/home/mike/Code/reiff/badennet/bnet-backend/models/enums_gen.go")
+	if err != nil {
+		t.Error(err)
+		t.Fail()
+	}
+
+}

confext/confParser.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"reflect"
 	"strconv"
+	"strings"
 	"time"
 )
 
@@ -172,6 +173,20 @@ func parseEnvToValue(envval string, fullEnvKey string, rvtype reflect.Type) (ref
 
 		return envcvl, nil
 
+	} else if rvtype.ConvertibleTo(reflect.TypeOf(false)) {
+
+		if strings.TrimSpace(strings.ToLower(envval)) == "true" {
+			return reflect.ValueOf(true).Convert(rvtype), nil
+		} else if strings.TrimSpace(strings.ToLower(envval)) == "false" {
+			return reflect.ValueOf(false).Convert(rvtype), nil
+		} else if strings.TrimSpace(strings.ToLower(envval)) == "1" {
+			return reflect.ValueOf(true).Convert(rvtype), nil
+		} else if strings.TrimSpace(strings.ToLower(envval)) == "0" {
+			return reflect.ValueOf(false).Convert(rvtype), nil
+		} else {
+			return reflect.Value{}, errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to <%s, ,bool> (value := '%s')", rvtype.Name(), fullEnvKey, envval))
+		}
+
 	} else if rvtype.ConvertibleTo(reflect.TypeOf("")) {
 
 		envcvl := reflect.ValueOf(envval).Convert(rvtype)

confext/confParser_test.go

@@ -68,6 +68,7 @@ func TestApplyEnvOverridesSimple(t *testing.T) {
 		V7 aliasstring   `env:"TEST_V7"`
 		V8 time.Duration `env:"TEST_V8"`
 		V9 time.Time     `env:"TEST_V9"`
+		VA bool          `env:"TEST_VA"`
 	}
 
 	data := testdata{
@@ -82,6 +83,7 @@ func TestApplyEnvOverridesSimple(t *testing.T) {
 		V7: "7",
 		V8: 9,
 		V9: time.Unix(1671102873, 0),
+		VA: false,
 	}
 
 	t.Setenv("TEST_V1", "846")
@@ -93,6 +95,7 @@ func TestApplyEnvOverridesSimple(t *testing.T) {
 	t.Setenv("TEST_V7", "AAAAAA")
 	t.Setenv("TEST_V8", "1min4s")
 	t.Setenv("TEST_V9", "2009-11-10T23:00:00Z")
+	t.Setenv("TEST_VA", "true")
 
 	err := ApplyEnvOverrides("", &data, ".")
 	if err != nil {
@@ -109,6 +112,7 @@ func TestApplyEnvOverridesSimple(t *testing.T) {
 	tst.AssertEqual(t, data.V7, "AAAAAA")
 	tst.AssertEqual(t, data.V8, time.Second*64)
 	tst.AssertEqual(t, data.V9, time.Unix(1257894000, 0).UTC())
+	tst.AssertEqual(t, data.VA, true)
 }
 
 func TestApplyEnvOverridesRecursive(t *testing.T) {

cursortoken/direction.go

@@ -0,0 +1,8 @@
+package cursortoken
+
+type SortDirection string //@enum:type
+
+const (
+	SortASC  SortDirection = "ASC"
+	SortDESC SortDirection = "DESC"
+)

cursortoken/filter.go

@@ -0,0 +1,10 @@
+package cursortoken
+
+import (
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+type Filter interface {
+	FilterQuery() mongo.Pipeline
+	Pagination() (string, SortDirection, string, SortDirection)
+}

cursortoken/token.go

@@ -0,0 +1,184 @@
+package cursortoken
+
+import (
+	"encoding/base32"
+	"encoding/json"
+	"errors"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"strings"
+	"time"
+)
+
+type Mode string
+
+const (
+	CTMStart  Mode = "START"
+	CTMNormal Mode = "NORMAL"
+	CTMEnd    Mode = "END"
+)
+
+type Extra struct {
+	Timestamp *time.Time
+	Id        *string
+	Page      *int
+	PageSize  *int
+}
+
+type CursorToken struct {
+	Mode               Mode
+	ValuePrimary       string
+	ValueSecondary     string
+	Direction          SortDirection
+	DirectionSecondary SortDirection
+	PageSize           int
+	Extra              Extra
+}
+
+type cursorTokenSerialize struct {
+	ValuePrimary       *string        `json:"v1,omitempty"`
+	ValueSecondary     *string        `json:"v2,omitempty"`
+	Direction          *SortDirection `json:"dir,omitempty"`
+	DirectionSecondary *SortDirection `json:"dir2,omitempty"`
+	PageSize           *int           `json:"size,omitempty"`
+
+	ExtraTimestamp *time.Time `json:"ts,omitempty"`
+	ExtraId        *string    `json:"id,omitempty"`
+	ExtraPage      *int       `json:"pg,omitempty"`
+	ExtraPageSize  *int       `json:"sz,omitempty"`
+}
+
+func Start() CursorToken {
+	return CursorToken{
+		Mode:               CTMStart,
+		ValuePrimary:       "",
+		ValueSecondary:     "",
+		Direction:          "",
+		DirectionSecondary: "",
+		PageSize:           0,
+		Extra:              Extra{},
+	}
+}
+
+func End() CursorToken {
+	return CursorToken{
+		Mode:               CTMEnd,
+		ValuePrimary:       "",
+		ValueSecondary:     "",
+		Direction:          "",
+		DirectionSecondary: "",
+		PageSize:           0,
+		Extra:              Extra{},
+	}
+}
+
+func (c *CursorToken) Token() string {
+	if c.Mode == CTMStart {
+		return "@start"
+	}
+	if c.Mode == CTMEnd {
+		return "@end"
+	}
+
+	// We kinda manually implement omitempty for the CursorToken here
+	// because omitempty does not work for time.Time and otherwise we would always
+	// get weird time values when decoding a token that initially didn't have an Timestamp set
+	// For this usecase we treat Unix=0 as an empty timestamp
+
+	sertok := cursorTokenSerialize{}
+
+	if c.ValuePrimary != "" {
+		sertok.ValuePrimary = &c.ValuePrimary
+	}
+	if c.ValueSecondary != "" {
+		sertok.ValueSecondary = &c.ValueSecondary
+	}
+	if c.Direction != "" {
+		sertok.Direction = &c.Direction
+	}
+	if c.DirectionSecondary != "" {
+		sertok.DirectionSecondary = &c.DirectionSecondary
+	}
+	if c.PageSize != 0 {
+		sertok.PageSize = &c.PageSize
+	}
+
+	sertok.ExtraTimestamp = c.Extra.Timestamp
+	sertok.ExtraId = c.Extra.Id
+	sertok.ExtraPage = c.Extra.Page
+	sertok.ExtraPageSize = c.Extra.PageSize
+
+	body, err := json.Marshal(sertok)
+	if err != nil {
+		panic(err)
+	}
+
+	return "tok_" + base32.StdEncoding.EncodeToString(body)
+}
+
+func Decode(tok string) (CursorToken, error) {
+	if tok == "" {
+		return Start(), nil
+	}
+	if strings.ToLower(tok) == "@start" {
+		return Start(), nil
+	}
+	if strings.ToLower(tok) == "@end" {
+		return End(), nil
+	}
+
+	if !strings.HasPrefix(tok, "tok_") {
+		return CursorToken{}, errors.New("could not decode token, missing prefix")
+	}
+
+	body, err := base32.StdEncoding.DecodeString(tok[len("tok_"):])
+	if err != nil {
+		return CursorToken{}, err
+	}
+
+	var tokenDeserialize cursorTokenSerialize
+	err = json.Unmarshal(body, &tokenDeserialize)
+	if err != nil {
+		return CursorToken{}, err
+	}
+
+	token := CursorToken{Mode: CTMNormal}
+
+	if tokenDeserialize.ValuePrimary != nil {
+		token.ValuePrimary = *tokenDeserialize.ValuePrimary
+	}
+	if tokenDeserialize.ValueSecondary != nil {
+		token.ValueSecondary = *tokenDeserialize.ValueSecondary
+	}
+	if tokenDeserialize.Direction != nil {
+		token.Direction = *tokenDeserialize.Direction
+	}
+	if tokenDeserialize.DirectionSecondary != nil {
+		token.DirectionSecondary = *tokenDeserialize.DirectionSecondary
+	}
+	if tokenDeserialize.PageSize != nil {
+		token.PageSize = *tokenDeserialize.PageSize
+	}
+
+	token.Extra.Timestamp = tokenDeserialize.ExtraTimestamp
+	token.Extra.Id = tokenDeserialize.ExtraId
+	token.Extra.Page = tokenDeserialize.ExtraPage
+	token.Extra.PageSize = tokenDeserialize.ExtraPageSize
+
+	return token, nil
+}
+
+func (c *CursorToken) ValuePrimaryObjectId() (primitive.ObjectID, bool) {
+	if oid, err := primitive.ObjectIDFromHex(c.ValuePrimary); err == nil {
+		return oid, true
+	} else {
+		return primitive.ObjectID{}, false
+	}
+}
+
+func (c *CursorToken) ValueSecondaryObjectId() (primitive.ObjectID, bool) {
+	if oid, err := primitive.ObjectIDFromHex(c.ValueSecondary); err == nil {
+		return oid, true
+	} else {
+		return primitive.ObjectID{}, false
+	}
+}

go.mod

@@ -3,12 +3,22 @@ module gogs.mikescher.com/BlackForestBytes/goext
 go 1.19
 
 require (
-	golang.org/x/sys v0.3.0
+	github.com/jmoiron/sqlx v1.3.5
-	golang.org/x/term v0.3.0
+	go.mongodb.org/mongo-driver v1.11.7
+	golang.org/x/crypto v0.10.0
+	golang.org/x/sys v0.9.0
+	golang.org/x/term v0.9.0
 )
 
 require (
-	github.com/jmoiron/sqlx v1.3.5 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
-	go.mongodb.org/mongo-driver v1.11.1 // indirect
+	github.com/klauspost/compress v1.16.6 // indirect
-	golang.org/x/crypto v0.4.0 // indirect
+	github.com/montanaflynn/stats v0.7.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.1.2 // indirect
+	github.com/xdg-go/stringprep v1.0.4 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a // indirect
+	golang.org/x/sync v0.3.0 // indirect
+	golang.org/x/text v0.10.0 // indirect
 )

go.sum

@@ -1,50 +1,127 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE=
 github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
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 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
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 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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-golang.org/x/term v0.1.0 h1:g6Z6vPFA9dYBAF7DWcH6sCcOntplXsDKcliusYijMlw=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.3.0 h1:qoo4akIqOcDME5bhc/NgxUdovd6BSS2uMsVjB56q1xI=
 golang.org/x/term v0.3.0/go.mod h1:q750SLmJuPmVoN1blW3UFBPREJfb1KmY3vwxfr+nFDA=
+golang.org/x/term v0.8.0 h1:n5xxQn2i3PC0yLAbjTpNT85q/Kgzcr2gIoX9OrJUols=
+golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
+golang.org/x/term v0.9.0 h1:GRRCnKYhdQrD8kfRAdQ6Zcw1P0OcELxGLKJvtjVMZ28=
+golang.org/x/term v0.9.0/go.mod h1:M6DEAAIenWoTxdKrOltXcmDY3rSplQUkrvaDU5FcQyo=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
+golang.org/x/text v0.5.0 h1:OLmvp0KP+FVG99Ct/qFiL/Fhk4zp4QQnZ7b2U+5piUM=
+golang.org/x/text v0.5.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.10.0 h1:UpjohKhiEgNc0CSauXmwYftY1+LlaC75SJwh0SgCX58=
+golang.org/x/text v0.10.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

goextVersion.go

@@ -0,0 +1,5 @@
+package goext
+
+const GoextVersion = "0.0.163"
+
+const GoextVersionTimestamp = "2023-06-18T01:16:52+0200"

gojson/encode.go

@@ -167,15 +167,30 @@ func Marshal(v any) ([]byte, error) {
 	return buf, nil
 }
 
+type IndentOpt struct {
+	Prefix string
+	Indent string
+}
+
 // MarshalSafeCollections is like Marshal except it will marshal nil maps and
 // slices as '{}' and '[]' respectfully instead of 'null'
-func MarshalSafeCollections(v interface{}, nilSafeSlices bool, nilSafeMaps bool) ([]byte, error) {
+func MarshalSafeCollections(v interface{}, nilSafeSlices bool, nilSafeMaps bool, indent *IndentOpt) ([]byte, error) {
 	e := &encodeState{}
 	err := e.marshal(v, encOpts{escapeHTML: true, nilSafeSlices: nilSafeSlices, nilSafeMaps: nilSafeMaps})
 	if err != nil {
 		return nil, err
 	}
+	b := e.Bytes()
+	if indent != nil {
+		var buf bytes.Buffer
+		err = Indent(&buf, b, indent.Prefix, indent.Indent)
+		if err != nil {
+			return nil, err
+		}
+		return buf.Bytes(), nil
+	} else {
 		return e.Bytes(), nil
+	}
 }
 
 // MarshalIndent is like Marshal but applies Indent to format the output.

gojson/encode_test.go

@@ -1274,7 +1274,7 @@ func TestMarshalSafeCollections(t *testing.T) {
 	}
 
 	for i, tt := range tests {
-		b, err := MarshalSafeCollections(tt.in, true, true)
+		b, err := MarshalSafeCollections(tt.in, true, true, nil)
 		if err != nil {
 			t.Errorf("test %d, unexpected failure: %v", i, err)
 		}

gojson/gionic.go

@@ -0,0 +1,44 @@
+package json
+
+import (
+	"net/http"
+)
+
+// Render interface is copied from github.com/gin-gonic/gin@v1.8.1/render/render.go
+type Render interface {
+	// Render writes data with custom ContentType.
+	Render(http.ResponseWriter) error
+	// WriteContentType writes custom ContentType.
+	WriteContentType(w http.ResponseWriter)
+}
+
+type GoJsonRender struct {
+	Data          any
+	NilSafeSlices bool
+	NilSafeMaps   bool
+	Indent        *IndentOpt
+}
+
+func (r GoJsonRender) Render(w http.ResponseWriter) error {
+	header := w.Header()
+	if val := header["Content-Type"]; len(val) == 0 {
+		header["Content-Type"] = []string{"application/json; charset=utf-8"}
+	}
+
+	jsonBytes, err := MarshalSafeCollections(r.Data, r.NilSafeSlices, r.NilSafeMaps, r.Indent)
+	if err != nil {
+		panic(err)
+	}
+	_, err = w.Write(jsonBytes)
+	if err != nil {
+		panic(err)
+	}
+	return nil
+}
+
+func (r GoJsonRender) WriteContentType(w http.ResponseWriter) {
+	header := w.Header()
+	if val := header["Content-Type"]; len(val) == 0 {
+		header["Content-Type"] = []string{"application/json; charset=utf-8"}
+	}
+}

langext/array.go

@@ -433,3 +433,10 @@ func ArrConcat[T any](arr ...[]T) []T {
 	}
 	return r
 }
+
+// ArrCopy does a shallow copy of the 'in' array
+func ArrCopy[T any](in []T) []T {
+	out := make([]T, len(in))
+	copy(out, in)
+	return out
+}

langext/compare.go

@@ -31,16 +31,16 @@ func CompareIntArr(arr1 []int, arr2 []int) bool {
 	return false
 }
 
-func CompareArr[T OrderedConstraint](arr1 []T, arr2 []T) bool {
+func CompareArr[T OrderedConstraint](arr1 []T, arr2 []T) int {
 
 	for i := 0; i < len(arr1) || i < len(arr2); i++ {
 
 		if i < len(arr1) && i < len(arr2) {
 
 			if arr1[i] < arr2[i] {
-				return true
+				return -1
 			} else if arr1[i] > arr2[i] {
-				return false
+				return +2
 			} else {
 				continue
 			}
@@ -49,15 +49,55 @@ func CompareArr[T OrderedConstraint](arr1 []T, arr2 []T) bool {
 
 		if i < len(arr1) {
 
-			return true
+			return +1
 
 		} else { // if i < len(arr2)
 
-			return false
+			return -1
 
 		}
 
 	}
 
-	return false
+	return 0
+}
+
+func CompareString(a, b string) int {
+	if a == b {
+		return 0
+	}
+	if a < b {
+		return -1
+	}
+	return +1
+}
+
+func CompareInt(a, b int) int {
+	if a == b {
+		return 0
+	}
+	if a < b {
+		return -1
+	}
+	return +1
+}
+
+func CompareInt64(a, b int64) int {
+	if a == b {
+		return 0
+	}
+	if a < b {
+		return -1
+	}
+	return +1
+}
+
+func Compare[T OrderedConstraint](a, b T) int {
+	if a == b {
+		return 0
+	}
+	if a < b {
+		return -1
+	}
+	return +1
 }

langext/maps.go

@@ -1,5 +1,10 @@
 package langext
 
+type MapEntry[T comparable, V any] struct {
+	Key   T
+	Value V
+}
+
 func MapKeyArr[T comparable, V any](v map[T]V) []T {
 	result := make([]T, 0, len(v))
 	for k := range v {
@@ -8,6 +13,14 @@ func MapKeyArr[T comparable, V any](v map[T]V) []T {
 	return result
 }
 
+func MapValueArr[T comparable, V any](v map[T]V) []V {
+	result := make([]V, 0, len(v))
+	for _, mv := range v {
+		result = append(result, mv)
+	}
+	return result
+}
+
 func ArrToMap[T comparable, V any](a []V, keyfunc func(V) T) map[T]V {
 	result := make(map[T]V, len(a))
 	for _, v := range a {
@@ -15,3 +28,30 @@ func ArrToMap[T comparable, V any](a []V, keyfunc func(V) T) map[T]V {
 	}
 	return result
 }
+
+func MapToArr[T comparable, V any](v map[T]V) []MapEntry[T, V] {
+	result := make([]MapEntry[T, V], 0, len(v))
+	for mk, mv := range v {
+		result = append(result, MapEntry[T, V]{
+			Key:   mk,
+			Value: mv,
+		})
+	}
+	return result
+}
+
+func CopyMap[K comparable, V any](a map[K]V) map[K]V {
+	result := make(map[K]V, len(a))
+	for k, v := range a {
+		result[k] = v
+	}
+	return result
+}
+
+func ForceMap[K comparable, V any](v map[K]V) map[K]V {
+	if v == nil {
+		return make(map[K]V, 0)
+	} else {
+		return v
+	}
+}

langext/panic.go

@@ -0,0 +1,71 @@
+package langext
+
+type PanicWrappedErr struct {
+	panic any
+}
+
+func (p PanicWrappedErr) Error() string {
+	return "A panic occured"
+}
+
+func (p PanicWrappedErr) ReoveredObj() any {
+	return p.panic
+}
+
+func RunPanicSafe(fn func()) (err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			err = PanicWrappedErr{panic: rec}
+		}
+	}()
+
+	fn()
+
+	return nil
+}
+
+func RunPanicSafeR1(fn func() error) (err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			err = PanicWrappedErr{panic: rec}
+		}
+	}()
+
+	return fn()
+}
+
+func RunPanicSafeR2[T1 any](fn func() (T1, error)) (r1 T1, err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			r1 = *new(T1)
+			err = PanicWrappedErr{panic: rec}
+		}
+	}()
+
+	return fn()
+}
+
+func RunPanicSafeR3[T1 any, T2 any](fn func() (T1, T2, error)) (r1 T1, r2 T2, err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			r1 = *new(T1)
+			r2 = *new(T2)
+			err = PanicWrappedErr{panic: rec}
+		}
+	}()
+
+	return fn()
+}
+
+func RunPanicSafeR4[T1 any, T2 any, T3 any](fn func() (T1, T2, T3, error)) (r1 T1, r2 T2, r3 T3, err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			r1 = *new(T1)
+			r2 = *new(T2)
+			r3 = *new(T3)
+			err = PanicWrappedErr{panic: rec}
+		}
+	}()
+
+	return fn()
+}

langext/pointer.go

@@ -4,6 +4,12 @@ import (
 	"reflect"
 )
 
+// PTrue := &true
+var PTrue = Ptr(true)
+
+// PFalse := &false
+var PFalse = Ptr(false)
+
 func Ptr[T any](v T) *T {
 	return &v
 }

langext/uuid.go

@@ -41,6 +41,14 @@ func NewHexUUID() (string, error) {
 	return string(dst), nil
 }
 
+func MustHexUUID() string {
+	v, err := NewHexUUID()
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
 func NewUpperHexUUID() (string, error) {
 	uuid, err := NewUUID()
 	if err != nil {
@@ -64,6 +72,14 @@ func NewUpperHexUUID() (string, error) {
 	return strings.ToUpper(string(dst)), nil
 }
 
+func MustUpperHexUUID() string {
+	v, err := NewUpperHexUUID()
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
 func NewRawHexUUID() (string, error) {
 	uuid, err := NewUUID()
 	if err != nil {
@@ -83,6 +99,14 @@ func NewRawHexUUID() (string, error) {
 	return strings.ToUpper(string(dst)), nil
 }
 
+func MustRawHexUUID() string {
+	v, err := NewRawHexUUID()
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
 func NewBracesUUID() (string, error) {
 	uuid, err := NewUUID()
 	if err != nil {
@@ -108,6 +132,14 @@ func NewBracesUUID() (string, error) {
 	return strings.ToUpper(string(dst)), nil
 }
 
+func MustBracesUUID() string {
+	v, err := NewBracesUUID()
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
 func NewParensUUID() (string, error) {
 	uuid, err := NewUUID()
 	if err != nil {
@@ -132,3 +164,11 @@ func NewParensUUID() (string, error) {
 
 	return strings.ToUpper(string(dst)), nil
 }
+
+func MustParensUUID() string {
+	v, err := NewParensUUID()
+	if err != nil {
+		panic(err)
+	}
+	return v
+}

mathext/math.go

@@ -22,6 +22,31 @@ func Max[T langext.OrderedConstraint](v1 T, v2 T) T {
 	}
 }
 
+func Max3[T langext.OrderedConstraint](v1 T, v2 T, v3 T) T {
+	result := v1
+	if v2 > result {
+		result = v2
+	}
+	if v3 > result {
+		result = v3
+	}
+	return result
+}
+
+func Max4[T langext.OrderedConstraint](v1 T, v2 T, v3 T, v4 T) T {
+	result := v1
+	if v2 > result {
+		result = v2
+	}
+	if v3 > result {
+		result = v3
+	}
+	if v4 > result {
+		result = v4
+	}
+	return result
+}
+
 func Min[T langext.OrderedConstraint](v1 T, v2 T) T {
 	if v1 < v2 {
 		return v1
@@ -30,6 +55,31 @@ func Min[T langext.OrderedConstraint](v1 T, v2 T) T {
 	}
 }
 
+func Min3[T langext.OrderedConstraint](v1 T, v2 T, v3 T) T {
+	result := v1
+	if v2 < result {
+		result = v2
+	}
+	if v3 < result {
+		result = v3
+	}
+	return result
+}
+
+func Min4[T langext.OrderedConstraint](v1 T, v2 T, v3 T, v4 T) T {
+	result := v1
+	if v2 < result {
+		result = v2
+	}
+	if v3 < result {
+		result = v3
+	}
+	if v4 < result {
+		result = v4
+	}
+	return result
+}
+
 func Abs[T langext.NumberConstraint](v T) T {
 	if v < 0 {
 		return -v

mongoext/pipeline.go

@@ -0,0 +1,49 @@
+package mongoext
+
+import (
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+// FixTextSearchPipeline moves {$match:{$text:{$search}}} entries to the front of the pipeline (otherwise its an mongo error)
+func FixTextSearchPipeline(pipeline mongo.Pipeline) mongo.Pipeline {
+
+	dget := func(v bson.D, k string) (bson.M, bool) {
+		for _, e := range v {
+			if e.Key == k {
+				if mv, ok := e.Value.(bson.M); ok {
+					return mv, true
+				}
+			}
+		}
+		return nil, false
+	}
+	mget := func(v bson.M, k string) (bson.M, bool) {
+		for ekey, eval := range v {
+			if ekey == k {
+				if mv, ok := eval.(bson.M); ok {
+					return mv, true
+				}
+			}
+		}
+		return nil, false
+	}
+
+	result := make([]bson.D, 0, len(pipeline))
+
+	for _, entry := range pipeline {
+
+		if v0, ok := dget(entry, "$match"); ok {
+			if v1, ok := mget(v0, "$text"); ok {
+				if _, ok := v1["$search"]; ok {
+					result = append([]bson.D{entry}, result...)
+					continue
+				}
+			}
+		}
+
+		result = append(result, entry)
+	}
+
+	return result
+}

mongoext/projections.go

@@ -0,0 +1,30 @@
+package mongoext
+
+import (
+	"go.mongodb.org/mongo-driver/bson"
+	"reflect"
+	"strings"
+)
+
+// ProjectionFromStruct automatically generated a mongodb projection for a struct
+// This way you can pretty much always write
+// `options.FindOne().SetProjection(mongoutils.ProjectionFromStruct(...your_model...))`
+// to only get the data from mongodb that you will actually use in the later decode step
+func ProjectionFromStruct(obj interface{}) bson.M {
+	v := reflect.ValueOf(obj)
+	t := v.Type()
+
+	result := bson.M{}
+
+	for i := 0; i < v.NumField(); i++ {
+		tag := t.Field(i).Tag.Get("bson")
+		if tag == "" {
+			continue
+		}
+		tag = strings.Split(tag, ",")[0]
+
+		result[tag] = 1
+	}
+
+	return result
+}

mongoext/registry.go

@@ -0,0 +1,28 @@
+package mongoext
+
+import (
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"gogs.mikescher.com/BlackForestBytes/goext/rfctime"
+	"reflect"
+)
+
+func CreateGoExtBsonRegistry() *bsoncodec.Registry {
+	rb := bsoncodec.NewRegistryBuilder()
+
+	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339Time{}), rfctime.RFC3339Time{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.RFC3339Time{}), rfctime.RFC3339Time{})
+
+	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339NanoTime{}), rfctime.RFC3339NanoTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.RFC3339NanoTime{}), rfctime.RFC3339NanoTime{})
+
+	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.Date{}), rfctime.Date{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(&rfctime.Date{}), rfctime.Date{})
+
+	bsoncodec.DefaultValueEncoders{}.RegisterDefaultEncoders(rb)
+	bsoncodec.DefaultValueDecoders{}.RegisterDefaultDecoders(rb)
+
+	bson.PrimitiveCodecs{}.RegisterPrimitiveCodecs(rb)
+
+	return rb.Build()
+}

reflectext/casting.go

@@ -0,0 +1,136 @@
+package reflectext
+
+import (
+	"reflect"
+)
+
+var reflectBasicTypes = map[reflect.Kind]reflect.Type{
+	reflect.Bool:       reflect.TypeOf(false),
+	reflect.Int:        reflect.TypeOf(int(0)),
+	reflect.Int8:       reflect.TypeOf(int8(0)),
+	reflect.Int16:      reflect.TypeOf(int16(0)),
+	reflect.Int32:      reflect.TypeOf(int32(0)),
+	reflect.Int64:      reflect.TypeOf(int64(0)),
+	reflect.Uint:       reflect.TypeOf(uint(0)),
+	reflect.Uint8:      reflect.TypeOf(uint8(0)),
+	reflect.Uint16:     reflect.TypeOf(uint16(0)),
+	reflect.Uint32:     reflect.TypeOf(uint32(0)),
+	reflect.Uint64:     reflect.TypeOf(uint64(0)),
+	reflect.Uintptr:    reflect.TypeOf(uintptr(0)),
+	reflect.Float32:    reflect.TypeOf(float32(0)),
+	reflect.Float64:    reflect.TypeOf(float64(0)),
+	reflect.Complex64:  reflect.TypeOf(complex64(0)),
+	reflect.Complex128: reflect.TypeOf(complex128(0)),
+	reflect.String:     reflect.TypeOf(""),
+}
+
+// Underlying returns the underlying type of t (without type alias)
+//
+// https://github.com/golang/go/issues/39574#issuecomment-655664772
+func Underlying(t reflect.Type) (ret reflect.Type) {
+	if t.Name() == "" {
+		// t is an unnamed type. the underlying type is t itself
+		return t
+	}
+	kind := t.Kind()
+	if ret = reflectBasicTypes[kind]; ret != nil {
+		return ret
+	}
+	switch kind {
+	case reflect.Array:
+		ret = reflect.ArrayOf(t.Len(), t.Elem())
+	case reflect.Chan:
+		ret = reflect.ChanOf(t.ChanDir(), t.Elem())
+	case reflect.Map:
+		ret = reflect.MapOf(t.Key(), t.Elem())
+	case reflect.Func:
+		nIn := t.NumIn()
+		nOut := t.NumOut()
+		in := make([]reflect.Type, nIn)
+		out := make([]reflect.Type, nOut)
+		for i := 0; i < nIn; i++ {
+			in[i] = t.In(i)
+		}
+		for i := 0; i < nOut; i++ {
+			out[i] = t.Out(i)
+		}
+		ret = reflect.FuncOf(in, out, t.IsVariadic())
+	case reflect.Interface:
+		// not supported
+	case reflect.Ptr:
+		ret = reflect.PtrTo(t.Elem())
+	case reflect.Slice:
+		ret = reflect.SliceOf(t.Elem())
+	case reflect.Struct:
+		// only partially supported: embedded fields
+		// and unexported fields may cause panic in reflect.StructOf()
+		defer func() {
+			// if a panic happens, return t unmodified
+			if recover() != nil && ret == nil {
+				ret = t
+			}
+		}()
+		n := t.NumField()
+		fields := make([]reflect.StructField, n)
+		for i := 0; i < n; i++ {
+			fields[i] = t.Field(i)
+		}
+		ret = reflect.StructOf(fields)
+	}
+	return ret
+}
+
+// TryCast works similar to `v2, ok := v.(T)`
+// Except it works through type alias'
+func TryCast[T any](v any) (T, bool) {
+
+	underlying := Underlying(reflect.TypeOf(v))
+
+	def := *new(T)
+
+	if underlying != Underlying(reflect.TypeOf(def)) {
+		return def, false
+	}
+
+	r1 := reflect.ValueOf(v)
+
+	if !r1.CanConvert(underlying) {
+		return def, false
+	}
+
+	r2 := r1.Convert(underlying)
+
+	r3 := r2.Interface()
+
+	r4, ok := r3.(T)
+	if !ok {
+		return def, false
+	}
+
+	return r4, true
+}
+
+func TryCastType(v any, dest reflect.Type) (any, bool) {
+
+	underlying := Underlying(reflect.TypeOf(v))
+
+	if underlying != Underlying(dest) {
+		return nil, false
+	}
+
+	r1 := reflect.ValueOf(v)
+
+	if !r1.CanConvert(underlying) {
+		return nil, false
+	}
+
+	r2 := r1.Convert(underlying)
+
+	if !r2.CanConvert(dest) {
+		return nil, false
+	}
+
+	r4 := r2.Convert(dest)
+
+	return r4.Interface(), true
+}

reflectext/primStrSer.go

@@ -0,0 +1,136 @@
+package reflectext
+
+import (
+	"errors"
+	"fmt"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"reflect"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var primitiveSerializer = map[reflect.Type]genSerializer{
+
+	reflect.TypeOf(""): newGenSerializer(serStringToString, serStringToString),
+
+	reflect.TypeOf(int(0)):   newGenSerializer(serIntNumToString[int], serStringToSIntNum[int]),
+	reflect.TypeOf(int32(0)): newGenSerializer(serIntNumToString[int32], serStringToSIntNum[int32]),
+	reflect.TypeOf(int64(0)): newGenSerializer(serIntNumToString[int64], serStringToSIntNum[int64]),
+
+	reflect.TypeOf(uint(0)):   newGenSerializer(serIntNumToString[uint], serStringToUIntNum[uint]),
+	reflect.TypeOf(uint32(0)): newGenSerializer(serIntNumToString[uint32], serStringToUIntNum[uint32]),
+	reflect.TypeOf(uint64(0)): newGenSerializer(serIntNumToString[uint64], serStringToUIntNum[uint64]),
+
+	reflect.TypeOf(float32(0)): newGenSerializer(serFloatNumToString[float32], serStringToFloatNum[float32]),
+	reflect.TypeOf(float64(0)): newGenSerializer(serFloatNumToString[float64], serStringToFloatNum[float64]),
+
+	reflect.TypeOf(true): newGenSerializer(serBoolToString, serStringToBool),
+
+	reflect.TypeOf(primitive.ObjectID{}): newGenSerializer(serObjectIDToString, serStringToObjectID),
+
+	reflect.TypeOf(time.Time{}): newGenSerializer(serTimeToString, serStringToTime),
+}
+
+type genSerializer struct {
+	ToString   func(v any) (string, error)
+	FromString func(v string) (any, error)
+}
+
+func newGenSerializer[TData any](tostr func(v TData) (string, error), fromstr func(v string) (TData, error)) genSerializer {
+	return genSerializer{
+		ToString: func(v any) (string, error) {
+			if tdv, ok := v.(TData); ok {
+				rv, err := tostr(tdv)
+				if err != nil {
+					return "", err
+				}
+				return rv, nil
+			} else {
+				return "", errors.New(fmt.Sprintf("cannot convert type %T to TData (%T)", v, *new(TData)))
+			}
+		},
+		FromString: func(v string) (any, error) {
+			nv, err := fromstr(v)
+			if err != nil {
+				return "", err
+			}
+			return nv, nil
+		},
+	}
+}
+
+func serStringToString(v string) (string, error) {
+	return v, nil
+}
+
+func serIntNumToString[TNum langext.IntegerConstraint](v TNum) (string, error) {
+	return strconv.FormatInt(int64(v), 10), nil
+}
+
+func serStringToSIntNum[TNum langext.SignedConstraint](v string) (TNum, error) {
+	r, err := strconv.ParseInt(v, 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	return TNum(r), nil
+}
+
+func serStringToUIntNum[TNum langext.UnsignedConstraint](v string) (TNum, error) {
+	r, err := strconv.ParseUint(v, 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	return TNum(r), nil
+}
+
+func serFloatNumToString[TNum langext.FloatConstraint](v TNum) (string, error) {
+	return strconv.FormatFloat(float64(v), 'f', -1, 64), nil
+}
+
+func serStringToFloatNum[TNum langext.FloatConstraint](v string) (TNum, error) {
+	r, err := strconv.ParseFloat(v, 64)
+	if err != nil {
+		return 0, err
+	}
+	return TNum(r), nil
+}
+
+func serBoolToString(v bool) (string, error) {
+	return langext.Conditional(v, "true", "false"), nil
+}
+
+func serStringToBool(v string) (bool, error) {
+	if strings.ToLower(v) == "true" {
+		return true, nil
+	}
+	if strings.ToLower(v) == "false" {
+		return true, nil
+	}
+	return false, errors.New(fmt.Sprintf("invalid boolean value '%s'", v))
+}
+
+func serObjectIDToString(v primitive.ObjectID) (string, error) {
+	return v.Hex(), nil
+}
+
+func serStringToObjectID(v string) (primitive.ObjectID, error) {
+	if rv, err := primitive.ObjectIDFromHex(v); err == nil {
+		return rv, nil
+	} else {
+		return primitive.ObjectID{}, err
+	}
+}
+
+func serTimeToString(v time.Time) (string, error) {
+	return v.Format(time.RFC3339Nano), nil
+}
+
+func serStringToTime(v string) (time.Time, error) {
+	if rv, err := time.Parse(time.RFC3339Nano, v); err == nil {
+		return rv, nil
+	} else {
+		return time.Time{}, err
+	}
+}

reflectext/primitiveStringSerializer.go

@@ -0,0 +1,92 @@
+package reflectext
+
+import (
+	"errors"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"reflect"
+)
+
+// PrimitiveStringSerializer is used to serialize primitive types (and a few more) from and to string
+// This is not really intended to be user facing, and more as a simple building block for other mechanisms
+// supports:
+//   - golang primitives (ints, uints, floats, bool, string)
+//   - type aliases
+//   - time.Time
+//   - primitive.ObjectID
+type PrimitiveStringSerializer struct{}
+
+func (pss PrimitiveStringSerializer) ValueToString(v any) (string, error) {
+
+	inType := reflect.TypeOf(v)
+
+	if inType.Kind() == reflect.Ptr && langext.IsNil(v) {
+		return "", nil
+	}
+
+	if inType.Kind() == reflect.Ptr {
+		rval1 := reflect.ValueOf(v)
+		rval2 := rval1.Elem()
+		rval3 := rval2.Interface()
+		return pss.ValueToString(rval3)
+	}
+
+	if conv, ok := primitiveSerializer[inType]; ok {
+		return conv.ToString(v)
+	}
+
+	for convType, conv := range primitiveSerializer {
+		if castV, ok := TryCastType(v, convType); ok {
+			return conv.ToString(castV)
+		}
+	}
+
+	return "", errors.New(fmt.Sprintf("failed to find a matching generic <toString> conversion fo type %T", v))
+}
+
+func (pss PrimitiveStringSerializer) ValueFromString(str string, outType reflect.Type) (any, error) {
+
+	if outType.Kind() == reflect.Ptr && str == "" {
+		return reflect.Zero(outType).Interface(), nil // = nil.(outType), nil
+	}
+
+	if str == "" {
+		return reflect.Zero(outType).Interface(), nil // = <default>(outType), nil
+	}
+
+	if outType.Kind() == reflect.Ptr {
+
+		innerValue, err := pss.ValueFromString(str, outType.Elem())
+		if err != nil {
+			return nil, err
+		}
+
+		// this weird piece of shit converts innerValue to &innerValue  (while keeping types)
+
+		rval1 := reflect.ValueOf(innerValue)
+		rval2 := rval1.Convert(outType.Elem())
+		rval3 := reflect.New(outType.Elem())
+		rval3.Elem().Set(rval2)
+		rval4 := rval3.Interface()
+
+		return rval4, nil
+	}
+
+	if conv, ok := primitiveSerializer[outType]; ok {
+		return conv.FromString(str)
+	}
+
+	emptyResultVal := reflect.Zero(outType).Interface()
+
+	for convType, conv := range primitiveSerializer {
+		if _, ok := TryCastType(emptyResultVal, convType); ok {
+			if convVal, err := conv.FromString(str); err == nil {
+				if resVal, ok := TryCastType(convVal, outType); ok {
+					return resVal, nil
+				}
+			}
+		}
+	}
+
+	return "", errors.New(fmt.Sprintf("failed to find a matching generic <toString> conversion fo type %s", outType.String()))
+}

rfctime/date.go

@@ -0,0 +1,240 @@
+package rfctime
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
+	"go.mongodb.org/mongo-driver/bson/bsontype"
+	"reflect"
+	"time"
+)
+
+type Date struct {
+	Year  int
+	Month int
+	Day   int
+}
+
+func (t Date) Time(loc *time.Location) time.Time {
+	return time.Date(t.Year, time.Month(t.Month), t.Day, 0, 0, 0, 0, loc)
+}
+
+func (t Date) TimeUTC() time.Time {
+	return time.Date(t.Year, time.Month(t.Month), t.Day, 0, 0, 0, 0, time.UTC)
+}
+
+func (t Date) TimeLocal() time.Time {
+	return time.Date(t.Year, time.Month(t.Month), t.Day, 0, 0, 0, 0, time.Local)
+}
+
+func (t Date) MarshalBinary() ([]byte, error) {
+	return t.TimeUTC().MarshalBinary()
+}
+
+func (t *Date) UnmarshalBinary(data []byte) error {
+	nt := time.Time{}
+	if err := nt.UnmarshalBinary(data); err != nil {
+		return err
+	}
+	t.Year = nt.Year()
+	t.Month = int(nt.Month())
+	t.Day = nt.Day()
+	return nil
+}
+
+func (t Date) GobEncode() ([]byte, error) {
+	return t.TimeUTC().GobEncode()
+}
+
+func (t *Date) GobDecode(data []byte) error {
+	nt := time.Time{}
+	if err := nt.GobDecode(data); err != nil {
+		return err
+	}
+	t.Year = nt.Year()
+	t.Month = int(nt.Month())
+	t.Day = nt.Day()
+	return nil
+}
+
+func (t *Date) UnmarshalJSON(data []byte) error {
+	str := ""
+	if err := json.Unmarshal(data, &str); err != nil {
+		return err
+	}
+	t0, err := time.Parse(t.FormatStr(), str)
+	if err != nil {
+		return err
+	}
+	t.Year = t0.Year()
+	t.Month = int(t0.Month())
+	t.Day = t0.Day()
+	return nil
+}
+
+func (t Date) MarshalJSON() ([]byte, error) {
+	str := t.TimeUTC().Format(t.FormatStr())
+	return json.Marshal(str)
+}
+
+func (t Date) MarshalText() ([]byte, error) {
+	b := make([]byte, 0, len(t.FormatStr()))
+	return t.TimeUTC().AppendFormat(b, t.FormatStr()), nil
+}
+
+func (t *Date) UnmarshalText(data []byte) error {
+	var err error
+	v, err := time.Parse(t.FormatStr(), string(data))
+	if err != nil {
+		return err
+	}
+	t.Year = v.Year()
+	t.Month = int(v.Month())
+	t.Day = v.Day()
+	return nil
+}
+
+func (t *Date) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
+	if bt == bsontype.Null {
+		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
+		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
+		// https://stackoverflow.com/questions/75167597
+		// https://jira.mongodb.org/browse/GODRIVER-2252
+		*t = Date{}
+		return nil
+	}
+	if bt != bsontype.String {
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into Date", bt))
+	}
+
+	var tt string
+	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
+	if err != nil {
+		return err
+	}
+
+	v, err := time.Parse(t.FormatStr(), tt)
+	if err != nil {
+		return err
+	}
+	t.Year = v.Year()
+	t.Month = int(v.Month())
+	t.Day = v.Day()
+
+	return nil
+}
+
+func (t Date) MarshalBSONValue() (bsontype.Type, []byte, error) {
+	return bson.MarshalValue(t.TimeUTC().Format(t.FormatStr()))
+}
+
+func (t Date) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		if !val.CanSet() {
+			return errors.New("ValueUnmarshalerDecodeValue")
+		}
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+
+	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr && len(src) == 0 {
+		val.Set(reflect.Zero(val.Type()))
+		return nil
+	}
+
+	err = t.UnmarshalBSONValue(tp, src)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&t))
+	} else {
+		val.Set(reflect.ValueOf(t))
+	}
+
+	return nil
+}
+
+func (t Date) Serialize() string {
+	return t.TimeUTC().Format(t.FormatStr())
+}
+
+func (t Date) FormatStr() string {
+	return "2006-01-02"
+}
+
+func (t Date) Date() (year int, month time.Month, day int) {
+	return t.TimeUTC().Date()
+}
+
+func (t Date) Weekday() time.Weekday {
+	return t.TimeUTC().Weekday()
+}
+
+func (t Date) ISOWeek() (year, week int) {
+	return t.TimeUTC().ISOWeek()
+}
+
+func (t Date) YearDay() int {
+	return t.TimeUTC().YearDay()
+}
+
+func (t Date) AddDate(years int, months int, days int) Date {
+	return NewDate(t.TimeUTC().AddDate(years, months, days))
+}
+
+func (t Date) Unix() int64 {
+	return t.TimeUTC().Unix()
+}
+
+func (t Date) UnixMilli() int64 {
+	return t.TimeUTC().UnixMilli()
+}
+
+func (t Date) UnixMicro() int64 {
+	return t.TimeUTC().UnixMicro()
+}
+
+func (t Date) UnixNano() int64 {
+	return t.TimeUTC().UnixNano()
+}
+
+func (t Date) Format(layout string) string {
+	return t.TimeUTC().Format(layout)
+}
+
+func (t Date) GoString() string {
+	return t.TimeUTC().GoString()
+}
+
+func (t Date) String() string {
+	return t.TimeUTC().String()
+}
+
+func NewDate(t time.Time) Date {
+	return Date{
+		Year:  t.Year(),
+		Month: int(t.Month()),
+		Day:   t.Day(),
+	}
+}
+
+func NowDate(loc *time.Location) Date {
+	return NewDate(time.Now().In(loc))
+}
+
+func NowDateLoc() Date {
+	return NewDate(time.Now().In(time.UTC))
+}
+
+func NowDateUTC() Date {
+	return NewDate(time.Now().In(time.Local))
+}

rfctime/interface_test.go

@@ -1,6 +1,7 @@
 package rfctime
 
 import (
+	"gogs.mikescher.com/BlackForestBytes/goext/tst"
 	"testing"
 	"time"
 )

rfctime/rfc3339.go

@@ -5,7 +5,10 @@ import (
 	"errors"
 	"fmt"
 	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
 	"go.mongodb.org/mongo-driver/bson/bsontype"
+	"reflect"
 	"time"
 )
 
@@ -67,6 +70,10 @@ func (t *RFC3339Time) UnmarshalText(data []byte) error {
 
 func (t *RFC3339Time) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
 	if bt == bsontype.Null {
+		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
+		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
+		// https://stackoverflow.com/questions/75167597
+		// https://jira.mongodb.org/browse/GODRIVER-2252
 		*t = RFC3339Time{}
 		return nil
 	}
@@ -74,7 +81,7 @@ func (t *RFC3339Time) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
 		return errors.New(fmt.Sprintf("cannot unmarshal %v into RFC3339Time", bt))
 	}
 	var tt time.Time
-	err := bson.Unmarshal(data, &tt)
+	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
 	if err != nil {
 		return err
 	}
@@ -86,6 +93,38 @@ func (t RFC3339Time) MarshalBSONValue() (bsontype.Type, []byte, error) {
 	return bson.MarshalValue(time.Time(t))
 }
 
+func (t RFC3339Time) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		if !val.CanSet() {
+			return errors.New("ValueUnmarshalerDecodeValue")
+		}
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+
+	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr && len(src) == 0 {
+		val.Set(reflect.Zero(val.Type()))
+		return nil
+	}
+
+	err = t.UnmarshalBSONValue(tp, src)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&t))
+	} else {
+		val.Set(reflect.ValueOf(t))
+	}
+
+	return nil
+}
+
 func (t RFC3339Time) Serialize() string {
 	return t.Time().Format(t.FormatStr())
 }

rfctime/rfc3339Nano.go

@@ -5,7 +5,10 @@ import (
 	"errors"
 	"fmt"
 	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
 	"go.mongodb.org/mongo-driver/bson/bsontype"
+	"reflect"
 	"time"
 )
 
@@ -67,6 +70,10 @@ func (t *RFC3339NanoTime) UnmarshalText(data []byte) error {
 
 func (t *RFC3339NanoTime) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
 	if bt == bsontype.Null {
+		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
+		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
+		// https://stackoverflow.com/questions/75167597
+		// https://jira.mongodb.org/browse/GODRIVER-2252
 		*t = RFC3339NanoTime{}
 		return nil
 	}
@@ -86,6 +93,38 @@ func (t RFC3339NanoTime) MarshalBSONValue() (bsontype.Type, []byte, error) {
 	return bson.MarshalValue(time.Time(t))
 }
 
+func (t RFC3339NanoTime) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		if !val.CanSet() {
+			return errors.New("ValueUnmarshalerDecodeValue")
+		}
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+
+	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr && len(src) == 0 {
+		val.Set(reflect.Zero(val.Type()))
+		return nil
+	}
+
+	err = t.UnmarshalBSONValue(tp, src)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&t))
+	} else {
+		val.Set(reflect.ValueOf(t))
+	}
+
+	return nil
+}
+
 func (t RFC3339NanoTime) Serialize() string {
 	return t.Time().Format(t.FormatStr())
 }

sq/converter.go

@@ -0,0 +1,91 @@
+package sq
+
+import (
+	"errors"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"time"
+)
+
+//TODO UNFINISHED
+// this is not finished
+// idea was that we can register converter in the database struct
+// they get inherited from the transactions
+// and when marshallingunmarshaling (sq.Query | sq.QueryAll)
+// or marshaling (sq.InsertSingle)
+// the types get converter automatically...
+
+type DBTypeConverter interface {
+	ModelTypeString() string
+	DBTypeString() string
+	ModelToDB(v any) (any, error)
+	DBToModel(v any) (any, error)
+}
+
+var ConverterBoolToBit = NewDBTypeConverter[bool, int](func(v bool) (int, error) {
+	return langext.Conditional(v, 1, 0), nil
+}, func(v int) (bool, error) {
+	if v == 0 {
+		return false, nil
+	}
+	if v == 1 {
+		return true, nil
+	}
+	return false, errors.New(fmt.Sprintf("invalid valud for boolean: '%d'", v))
+})
+
+var ConverterTimeToUnixMillis = NewDBTypeConverter[time.Time, int64](func(v time.Time) (int64, error) {
+	return v.UnixMilli(), nil
+}, func(v int64) (time.Time, error) {
+	return time.UnixMilli(v), nil
+})
+
+var ConverterOptTimeToUnixMillis = NewDBTypeConverter[*time.Time, *int64](func(v *time.Time) (*int64, error) {
+	if v == nil {
+		return nil, nil
+	}
+	return langext.Ptr(v.UnixMilli()), nil
+}, func(v *int64) (*time.Time, error) {
+	if v == nil {
+		return nil, nil
+	}
+	return langext.Ptr(time.UnixMilli(*v)), nil
+})
+
+type dbTypeConverterImpl[TModelData any, TDBData any] struct {
+	dbTypeString    string
+	modelTypeString string
+	todb            func(v TModelData) (TDBData, error)
+	tomodel         func(v TDBData) (TModelData, error)
+}
+
+func (t *dbTypeConverterImpl[TModelData, TDBData]) ModelTypeString() string {
+	return t.modelTypeString
+}
+
+func (t *dbTypeConverterImpl[TModelData, TDBData]) DBTypeString() string {
+	return t.dbTypeString
+}
+
+func (t *dbTypeConverterImpl[TModelData, TDBData]) ModelToDB(v any) (any, error) {
+	if vv, ok := v.(TModelData); ok {
+		return t.todb(vv)
+	}
+	return nil, errors.New(fmt.Sprintf("Unexpected value in DBTypeConverter, expected '%s', found '%T'", t.modelTypeString, v))
+}
+
+func (t *dbTypeConverterImpl[TModelData, TDBData]) DBToModel(v any) (any, error) {
+	if vv, ok := v.(TDBData); ok {
+		return t.tomodel(vv)
+	}
+	return nil, errors.New(fmt.Sprintf("Unexpected value in DBTypeConverter, expected '%s', found '%T'", t.dbTypeString, v))
+}
+
+func NewDBTypeConverter[TModelData any, TDBData any](todb func(v TModelData) (TDBData, error), tomodel func(v TDBData) (TModelData, error)) DBTypeConverter {
+	return &dbTypeConverterImpl[TModelData, TDBData]{
+		dbTypeString:    fmt.Sprintf("%T", *new(TDBData)),
+		modelTypeString: fmt.Sprintf("%T", *new(TModelData)),
+		todb:            todb,
+		tomodel:         tomodel,
+	}
+}

sq/hasher.go

@@ -0,0 +1,199 @@
+package sq
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"github.com/jmoiron/sqlx"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func HashSqliteSchema(ctx context.Context, schemaStr string) (string, error) {
+	dbdir := os.TempDir()
+	dbfile1 := filepath.Join(dbdir, langext.MustHexUUID()+".sqlite3")
+
+	err := os.MkdirAll(dbdir, os.ModePerm)
+	if err != nil {
+		return "", err
+	}
+
+	url := fmt.Sprintf("file:%s?_journal=%s&_timeout=%d&_fk=%s&_busy_timeout=%d", dbfile1, "DELETE", 1000, "true", 1000)
+
+	xdb, err := sqlx.Open("sqlite3", url)
+	if err != nil {
+		return "", err
+	}
+
+	db := NewDB(xdb)
+
+	_, err = db.Exec(ctx, schemaStr, PP{})
+	if err != nil {
+		return "", err
+	}
+
+	return HashSqliteDatabase(ctx, db)
+}
+
+func HashSqliteDatabase(ctx context.Context, db DB) (string, error) {
+	ss, err := CreateSqliteDatabaseSchemaString(ctx, db)
+	if err != nil {
+		return "", err
+	}
+
+	cs := sha256.Sum256([]byte(ss))
+
+	return hex.EncodeToString(cs[:]), nil
+}
+
+func CreateSqliteDatabaseSchemaString(ctx context.Context, db DB) (string, error) {
+
+	type colInfo struct {
+		Name       string  `db:"name"`
+		Type       string  `db:"type"`
+		NotNull    string  `db:"notnull"`
+		Default    *string `db:"dflt_value"`
+		PrimaryKey *string `db:"pk"`
+	}
+
+	type idxInfo struct {
+		Name   string `json:"name"       db:"name"`
+		Unique int    `json:"unique"     db:"unique"`
+		Origin string `json:"origin"     db:"origin"`
+		Patial int    `json:"partial"    db:"partial"`
+	}
+
+	type fkyInfo struct {
+		TableDest string `json:"table_dest"  db:"table"`
+		From      string `json:"from"        db:"from"`
+		To        string `json:"to"          db:"to"`
+		OnUpdate  string `json:"on_update"   db:"on_update"`
+		OnDelete  string `json:"on_delete"   db:"on_delete"`
+		Match     string `json:"match"       db:"match"`
+	}
+
+	type tabInfo struct {
+		Name   string `json:"name"    db:"name"`
+		Type   string `json:"type"    db:"type"`
+		NumCol int    `json:"ncol"    db:"ncol"`
+		Strict int    `json:"strict"  db:"strict"`
+
+		ColumnInfo []colInfo `json:"-"`
+		IndexInfo  []idxInfo `json:"-"`
+		FKeyInfo   []fkyInfo `json:"-"`
+	}
+
+	rowsTableList, err := db.Query(ctx, "PRAGMA table_list;", PP{})
+	if err != nil {
+		return "", err
+	}
+	tableList, err := ScanAll[tabInfo](rowsTableList, SModeFast, Unsafe, true)
+	if err != nil {
+		return "", err
+	}
+
+	langext.SortBy(tableList, func(v tabInfo) string { return v.Name })
+
+	result := make([]tabInfo, 0)
+
+	for i, tab := range tableList {
+
+		if strings.HasPrefix(tab.Name, "sqlite_") {
+			continue
+		}
+
+		{
+
+			rowsColumnList, err := db.Query(ctx, fmt.Sprintf("PRAGMA table_info(\"%s\");", tab.Name), PP{})
+			if err != nil {
+				return "", err
+			}
+
+			columnList, err := ScanAll[colInfo](rowsColumnList, SModeFast, Unsafe, true)
+			if err != nil {
+				return "", err
+			}
+
+			langext.SortBy(columnList, func(v colInfo) string { return v.Name })
+
+			tableList[i].ColumnInfo = columnList
+		}
+
+		{
+			rowsIdxList, err := db.Query(ctx, fmt.Sprintf("PRAGMA index_list(\"%s\");", tab.Name), PP{})
+			if err != nil {
+				return "", err
+			}
+			idxList, err := ScanAll[idxInfo](rowsIdxList, SModeFast, Unsafe, true)
+			if err != nil {
+				return "", err
+			}
+
+			langext.SortBy(idxList, func(v idxInfo) string { return v.Name })
+
+			tableList[i].IndexInfo = idxList
+		}
+
+		{
+			rowsIdxList, err := db.Query(ctx, fmt.Sprintf("PRAGMA foreign_key_list(\"%s\");", tab.Name), PP{})
+			if err != nil {
+				return "", err
+			}
+			fkyList, err := ScanAll[fkyInfo](rowsIdxList, SModeFast, Unsafe, true)
+			if err != nil {
+				return "", err
+			}
+
+			langext.SortBy(fkyList, func(v fkyInfo) string { return v.From })
+
+			tableList[i].FKeyInfo = fkyList
+		}
+
+		result = append(result, tableList[i])
+	}
+
+	strBuilderResult := ""
+	for _, vTab := range result {
+		jbinTable, err := json.Marshal(vTab)
+		if err != nil {
+			return "", err
+		}
+
+		strBuilderResult += fmt.Sprintf("#TABLE: %s\n{\n", string(jbinTable))
+
+		for _, vCol := range vTab.ColumnInfo {
+			jbinColumn, err := json.Marshal(vCol)
+			if err != nil {
+				return "", err
+			}
+
+			strBuilderResult += fmt.Sprintf("    COLUMN: %s\n", string(jbinColumn))
+		}
+
+		for _, vIdx := range vTab.IndexInfo {
+			jbinIndex, err := json.Marshal(vIdx)
+			if err != nil {
+				return "", err
+			}
+
+			strBuilderResult += fmt.Sprintf("    INDEX:  %s\n", string(jbinIndex))
+		}
+
+		for _, vFky := range vTab.FKeyInfo {
+			jbinFKey, err := json.Marshal(vFky)
+			if err != nil {
+				return "", err
+			}
+
+			strBuilderResult += fmt.Sprintf("    FKEY:   %s\n", string(jbinFKey))
+		}
+
+		strBuilderResult += "}\n\n"
+	}
+
+	return strBuilderResult, nil
+}

sq/scanner.go

@@ -1,9 +1,13 @@
 package sq
 
 import (
+	"context"
 	"database/sql"
 	"errors"
+	"fmt"
 	"github.com/jmoiron/sqlx"
+	"reflect"
+	"strings"
 )
 
 type StructScanMode string
@@ -16,10 +20,79 @@ const (
 type StructScanSafety string
 
 const (
-	Safe   StructScanSafety = "SAFE"
+	Safe   StructScanSafety = "SAFE"   // return error for missing fields
-	Unsafe StructScanSafety = "UNSAFE"
+	Unsafe StructScanSafety = "UNSAFE" // ignore missing fields
 )
 
+func InsertSingle[TData any](ctx context.Context, q Queryable, tableName string, v TData) (sql.Result, error) {
+
+	rval := reflect.ValueOf(v)
+	rtyp := rval.Type()
+
+	columns := make([]string, 0)
+	params := make([]string, 0)
+	pp := PP{}
+
+	for i := 0; i < rtyp.NumField(); i++ {
+
+		rsfield := rtyp.Field(i)
+		rvfield := rval.Field(i)
+
+		if !rsfield.IsExported() {
+			continue
+		}
+
+		columnName := rsfield.Tag.Get("db")
+		if columnName == "" || columnName == "-" {
+			continue
+		}
+
+		paramkey := fmt.Sprintf("_%s", columnName)
+
+		columns = append(columns, "\""+columnName+"\"")
+		params = append(params, ":"+paramkey)
+		pp[paramkey] = rvfield.Interface()
+
+	}
+
+	sqlstr := fmt.Sprintf("INSERT"+" INTO \"%s\" (%s) VALUES (%s)", tableName, strings.Join(columns, ", "), strings.Join(params, ", "))
+
+	sqlr, err := q.Exec(ctx, sqlstr, pp)
+	if err != nil {
+		return nil, err
+	}
+
+	return sqlr, nil
+}
+
+func QuerySingle[TData any](ctx context.Context, q Queryable, sql string, pp PP, mode StructScanMode, sec StructScanSafety) (TData, error) {
+	rows, err := q.Query(ctx, sql, pp)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	data, err := ScanSingle[TData](rows, mode, sec, true)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	return data, nil
+}
+
+func QueryAll[TData any](ctx context.Context, q Queryable, sql string, pp PP, mode StructScanMode, sec StructScanSafety) ([]TData, error) {
+	rows, err := q.Query(ctx, sql, pp)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := ScanAll[TData](rows, mode, sec, true)
+	if err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
 func ScanSingle[TData any](rows *sqlx.Rows, mode StructScanMode, sec StructScanSafety, close bool) (TData, error) {
 	if rows.Next() {
 		var strscan *StructScanner

wmo/collection.go

@@ -0,0 +1,95 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson/bsontype"
+	"go.mongodb.org/mongo-driver/mongo"
+	ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"reflect"
+)
+
+type EntityID interface {
+	MarshalBSONValue() (bsontype.Type, []byte, error)
+	String() string
+}
+
+type Decodable interface {
+	Decode(v any) error
+}
+
+type Cursorable interface {
+	Decode(v any) error
+	Err() error
+	Close(ctx context.Context) error
+	All(ctx context.Context, results any) error
+	RemainingBatchLength() int
+	Next(ctx context.Context) bool
+}
+
+type fullTypeRef struct {
+	IsPointer      bool
+	Kind           reflect.Kind
+	RealType       reflect.Type
+	Type           reflect.Type
+	UnderlyingType reflect.Type
+	Name           string
+	Index          []int
+}
+
+type Coll[TData any] struct {
+	coll                *mongo.Collection                                        // internal mongo collection, access via Collection()
+	dataTypeMap         map[string]fullTypeRef                                   // list of TData fields (only if TData is not an interface)
+	implDataTypeMap     map[reflect.Type]map[string]fullTypeRef                  // dynamic list of fields of TData implementations (only if TData is an interface)
+	customDecoder       *func(ctx context.Context, dec Decodable) (TData, error) // custom decoding function (useful if TData is an interface)
+	isInterfaceDataType bool                                                     // true if TData is an interface (not a struct)
+}
+
+func (c *Coll[TData]) Collection() *mongo.Collection {
+	return c.coll
+}
+
+func (c *Coll[TData]) Name() string {
+	return c.coll.Name()
+}
+
+func (c *Coll[TData]) WithDecodeFunc(cdf func(ctx context.Context, dec Decodable) (TData, error), example TData) *Coll[TData] {
+
+	c.EnsureInitializedReflection(example)
+
+	c.customDecoder = langext.Ptr(cdf)
+	return c
+}
+
+func (c *Coll[TData]) Indexes() mongo.IndexView {
+	return c.coll.Indexes()
+}
+
+func (c *Coll[TData]) Drop(ctx context.Context) error {
+	return c.coll.Drop(ctx)
+}
+
+func (c *Coll[TData]) createToken(fieldPrimary string, dirPrimary ct.SortDirection, fieldSecondary *string, dirSecondary *ct.SortDirection, lastEntity TData, pageSize *int) (ct.CursorToken, error) {
+
+	valuePrimary, err := c.getFieldValueAsTokenString(lastEntity, fieldPrimary)
+	if err != nil {
+		return ct.CursorToken{}, err
+	}
+
+	valueSeconary := ""
+	if fieldSecondary != nil && dirSecondary != nil {
+		valueSeconary, err = c.getFieldValueAsTokenString(lastEntity, *fieldSecondary)
+		if err != nil {
+			return ct.CursorToken{}, err
+		}
+	}
+
+	return ct.CursorToken{
+		Mode:           ct.CTMNormal,
+		ValuePrimary:   valuePrimary,
+		ValueSecondary: valueSeconary,
+		Direction:      dirPrimary,
+		PageSize:       langext.Coalesce(pageSize, 0),
+		Extra:          ct.Extra{},
+	}, nil
+}

wmo/decoding.go

@@ -0,0 +1,54 @@
+package wmo
+
+import (
+	"context"
+)
+
+func (c *Coll[TData]) decodeSingle(ctx context.Context, dec Decodable) (TData, error) {
+	if c.customDecoder != nil {
+
+		return (*c.customDecoder)(ctx, dec)
+
+	} else {
+
+		var res TData
+
+		err := dec.Decode(&res)
+		if err != nil {
+			return *new(TData), err
+		}
+
+		return res, nil
+
+	}
+}
+
+func (c *Coll[TData]) decodeAll(ctx context.Context, cursor Cursorable) ([]TData, error) {
+	if c.customDecoder != nil {
+
+		res := make([]TData, 0, cursor.RemainingBatchLength())
+
+		for cursor.Next(ctx) {
+			entry, err := (*c.customDecoder)(ctx, cursor)
+			if err != nil {
+				return nil, err
+			}
+			res = append(res, entry)
+		}
+
+		return res, nil
+
+	} else {
+
+		res := make([]TData, 0, cursor.RemainingBatchLength())
+
+		err := cursor.All(ctx, &res)
+		if err != nil {
+			return nil, err
+		}
+
+		return res, nil
+
+	}
+
+}

wmo/mongo.go

@@ -0,0 +1,11 @@
+package wmo
+
+import "go.mongodb.org/mongo-driver/mongo"
+
+func W[TData any](collection *mongo.Collection) *Coll[TData] {
+	c := Coll[TData]{coll: collection}
+
+	c.init()
+
+	return &c
+}

wmo/pagination.go

@@ -0,0 +1,87 @@
+package wmo
+
+import (
+	"errors"
+	"go.mongodb.org/mongo-driver/bson"
+	ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
+)
+
+func CreatePagination[TData any](coll *Coll[TData], token ct.CursorToken, fieldPrimary string, sortPrimary ct.SortDirection, fieldSecondary *string, sortSecondary *ct.SortDirection, pageSize *int) ([]bson.D, error) {
+
+	cond := bson.A{}
+	sort := bson.D{}
+
+	valuePrimary, err := coll.getTokenValueAsMongoType(token.ValuePrimary, fieldPrimary)
+	if err != nil {
+		return nil, err
+	}
+
+	if sortPrimary == ct.SortASC {
+		// We sort ASC on <field> - so we want all entries newer ($gt) than the $primary
+		cond = append(cond, bson.M{fieldPrimary: bson.M{"$gt": valuePrimary}})
+		sort = append(sort, bson.E{Key: fieldPrimary, Value: +1})
+	} else if sortPrimary == ct.SortDESC {
+		// We sort DESC on <field> - so we want all entries older ($lt) than the $primary
+		cond = append(cond, bson.M{fieldPrimary: bson.M{"$lt": valuePrimary}})
+		sort = append(sort, bson.E{Key: fieldPrimary, Value: -1})
+	}
+
+	if fieldSecondary != nil && sortSecondary != nil && *fieldSecondary != fieldPrimary {
+
+		valueSecondary, err := coll.getTokenValueAsMongoType(token.ValueSecondary, *fieldSecondary)
+		if err != nil {
+			return nil, err
+		}
+
+		if *sortSecondary == ct.SortASC {
+
+			// the conflict-resolution condition, for entries with the _same_ <field> as the $primary we take the ones with a greater $secondary (= newer)
+			cond = append(cond, bson.M{"$and": bson.A{
+				bson.M{fieldPrimary: valuePrimary},
+				bson.M{*fieldSecondary: bson.M{"$gt": valueSecondary}},
+			}})
+
+			sort = append(sort, bson.E{Key: fieldPrimary, Value: +1})
+
+		} else if *sortSecondary == ct.SortDESC {
+
+			// the conflict-resolution condition, for entries with the _same_ <field> as the $primary we take the ones with a smaller $secondary (= older)
+			cond = append(cond, bson.M{"$and": bson.A{
+				bson.M{fieldPrimary: valuePrimary},
+				bson.M{*fieldSecondary: bson.M{"$lt": valueSecondary}},
+			}})
+
+			sort = append(sort, bson.E{Key: fieldPrimary, Value: -1})
+
+		}
+	}
+
+	pipeline := make([]bson.D, 0, 3)
+
+	if token.Mode == ct.CTMStart {
+
+		// no gt/lt condition
+
+	} else if token.Mode == ct.CTMNormal {
+
+		pipeline = append(pipeline, bson.D{{Key: "$match", Value: bson.M{"$or": cond}}})
+
+	} else if token.Mode == ct.CTMEnd {
+
+		// false
+		pipeline = append(pipeline, bson.D{{Key: "$match", Value: bson.M{"$expr": bson.M{"$eq": bson.A{"1", "0"}}}}})
+
+	} else {
+
+		return nil, errors.New("unknown ct mode: " + string(token.Mode))
+
+	}
+
+	pipeline = append(pipeline, bson.D{{Key: "$sort", Value: sort}})
+
+	if pageSize != nil {
+		pipeline = append(pipeline, bson.D{{Key: "$limit", Value: int64(*pageSize + 1)}})
+	}
+
+	return pipeline, nil
+}

wmo/queryAggregate.go

@@ -0,0 +1,38 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+func (c *Coll[TData]) Aggregate(ctx context.Context, pipeline mongo.Pipeline, opts ...*options.AggregateOptions) ([]TData, error) {
+	cursor, err := c.coll.Aggregate(ctx, pipeline, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := c.decodeAll(ctx, cursor)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
+func (c *Coll[TData]) AggregateOneOpt(ctx context.Context, pipeline mongo.Pipeline, opts ...*options.AggregateOptions) (*TData, error) {
+	cursor, err := c.coll.Aggregate(ctx, pipeline, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	if cursor.Next(ctx) {
+		v, err := c.decodeSingle(ctx, cursor)
+		if err != nil {
+			return nil, err
+		}
+		return &v, nil
+	}
+
+	return nil, nil
+}

wmo/queryDelete.go

@@ -0,0 +1,34 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+func (c *Coll[TData]) DeleteOneByID(ctx context.Context, id EntityID) error {
+	_, err := c.coll.DeleteOne(ctx, bson.M{"_id": id})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) DeleteOne(ctx context.Context, filterQuery bson.M) error {
+	_, err := c.coll.DeleteOne(ctx, filterQuery)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) DeleteMany(ctx context.Context, filterQuery bson.M) (*mongo.DeleteResult, error) {
+	res, err := c.coll.DeleteMany(ctx, filterQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}

wmo/queryFind.go

@@ -0,0 +1,62 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+func (c *Coll[TData]) FindOne(ctx context.Context, filter bson.M) (TData, error) {
+	mongoRes := c.coll.FindOne(ctx, filter)
+
+	return c.decodeSingle(ctx, mongoRes)
+}
+
+func (c *Coll[TData]) FindOneOpt(ctx context.Context, filter bson.M) (*TData, error) {
+	mongoRes := c.coll.FindOne(ctx, filter)
+
+	res, err := c.decodeSingle(ctx, mongoRes)
+	if err == mongo.ErrNoDocuments {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return &res, nil
+}
+
+func (c *Coll[TData]) FindOneByID(ctx context.Context, id EntityID) (TData, error) {
+	mongoRes := c.coll.FindOne(ctx, bson.M{"_id": id})
+
+	return c.decodeSingle(ctx, mongoRes)
+}
+
+func (c *Coll[TData]) FindOneOptByID(ctx context.Context, id EntityID) (*TData, error) {
+	mongoRes := c.coll.FindOne(ctx, bson.M{"_id": id})
+
+	res, err := c.decodeSingle(ctx, mongoRes)
+	if err == mongo.ErrNoDocuments {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return &res, nil
+}
+
+func (c *Coll[TData]) Find(ctx context.Context, filter bson.M, opts ...*options.FindOptions) ([]TData, error) {
+	cursor, err := c.coll.Find(ctx, filter, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := c.decodeAll(ctx, cursor)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}

wmo/queryInsert.go

@@ -0,0 +1,17 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+func (c *Coll[TData]) InsertOne(ctx context.Context, valueIn TData) (TData, error) {
+	insRes, err := c.coll.InsertOne(ctx, valueIn)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	mongoRes := c.coll.FindOne(ctx, bson.M{"_id": insRes.InsertedID})
+
+	return c.decodeSingle(ctx, mongoRes)
+}

wmo/queryList.go

@@ -0,0 +1,99 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
+)
+
+func (c *Coll[TData]) List(ctx context.Context, filter ct.Filter, pageSize *int, inTok ct.CursorToken) ([]TData, ct.CursorToken, error) {
+	if inTok.Mode == ct.CTMEnd {
+		return make([]TData, 0), ct.End(), nil
+	}
+
+	pipeline := filter.FilterQuery()
+
+	pf1, pd1, pf2, pd2 := filter.Pagination()
+
+	sortPrimary := pf1
+	sortDirPrimary := pd1
+	sortSecondary := &pf2
+	sortDirSecondary := &pd2
+
+	if pf1 == pf2 {
+		sortSecondary = nil
+		sortDirSecondary = nil
+	}
+
+	paginationPipeline, err := CreatePagination(c, inTok, sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, pageSize)
+	if err != nil {
+		return nil, ct.CursorToken{}, err
+	}
+
+	pipeline = append(pipeline, paginationPipeline...)
+
+	cursor, err := c.coll.Aggregate(ctx, pipeline)
+	if err != nil {
+		return nil, ct.CursorToken{}, err
+	}
+
+	// fast branch
+	if pageSize == nil {
+		entries, err := c.decodeAll(ctx, cursor)
+		if err != nil {
+			return nil, ct.CursorToken{}, err
+		}
+		return entries, ct.End(), nil
+	}
+
+	entities := make([]TData, 0, cursor.RemainingBatchLength())
+	for (pageSize == nil || len(entities) != *pageSize) && cursor.Next(ctx) {
+		var entry TData
+		entry, err = c.decodeSingle(ctx, cursor)
+		if err != nil {
+			return nil, ct.CursorToken{}, err
+		}
+		entities = append(entities, entry)
+	}
+
+	if pageSize == nil || len(entities) < *pageSize || !cursor.TryNext(ctx) {
+		return entities, ct.End(), nil
+	}
+
+	last := entities[len(entities)-1]
+
+	c.EnsureInitializedReflection(last)
+
+	nextToken, err := c.createToken(sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, last, pageSize)
+	if err != nil {
+		return nil, ct.CursorToken{}, err
+	}
+
+	return entities, nextToken, nil
+}
+
+type countRes struct {
+	Count int64 `bson:"c"`
+}
+
+func (c *Coll[TData]) Count(ctx context.Context, filter ct.Filter) (int64, error) {
+	pipeline := filter.FilterQuery()
+
+	pipeline = append(pipeline, bson.D{{Key: "$count", Value: "c"}})
+
+	cursor, err := c.coll.Aggregate(ctx, pipeline)
+	if err != nil {
+		return 0, err
+	}
+
+	if cursor.Next(ctx) {
+		v := countRes{}
+		err = cursor.Decode(&v)
+		if err != nil {
+			return 0, err
+		}
+		return v.Count, nil
+	}
+
+	return 0, nil
+}

wmo/queryUpdate.go

@@ -0,0 +1,56 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+func (c *Coll[TData]) FindOneAndUpdate(ctx context.Context, filterQuery bson.M, updateQuery bson.M) (TData, error) {
+	mongoRes := c.coll.FindOneAndUpdate(ctx, filterQuery, updateQuery, options.FindOneAndUpdate().SetReturnDocument(options.After))
+
+	return c.decodeSingle(ctx, mongoRes)
+}
+
+func (c *Coll[TData]) UpdateOne(ctx context.Context, filterQuery bson.M, updateQuery bson.M) error {
+	_, err := c.coll.UpdateOne(ctx, filterQuery, updateQuery)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) UpdateOneByID(ctx context.Context, id EntityID, updateQuery bson.M) error {
+	_, err := c.coll.UpdateOne(ctx, bson.M{"_id": id}, updateQuery)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) UpdateMany(ctx context.Context, filterQuery bson.M, updateQuery bson.M) (*mongo.UpdateResult, error) {
+	res, err := c.coll.UpdateMany(ctx, filterQuery, updateQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
+func (c *Coll[TData]) ReplaceOne(ctx context.Context, filterQuery bson.M, value TData) error {
+	_, err := c.coll.UpdateOne(ctx, filterQuery, bson.M{"$set": value})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) FindOneAndReplace(ctx context.Context, filterQuery bson.M, value TData) (TData, error) {
+	mongoRes := c.coll.FindOneAndUpdate(ctx, filterQuery, bson.M{"$set": value}, options.FindOneAndUpdate().SetReturnDocument(options.After))
+
+	return c.decodeSingle(ctx, mongoRes)
+}

wmo/reflection.go

@@ -0,0 +1,215 @@
+package wmo
+
+import (
+	"errors"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"gogs.mikescher.com/BlackForestBytes/goext/reflectext"
+	"reflect"
+	"strings"
+)
+
+func (c *Coll[TData]) EnsureInitializedReflection(v TData) {
+
+	if !c.isInterfaceDataType {
+		return // only dynamically load dataTypeMap on interface TData
+	}
+
+	rval := reflect.ValueOf(v)
+	for rval.Type().Kind() == reflect.Pointer {
+		rval = rval.Elem()
+	}
+
+	if _, ok := c.implDataTypeMap[rval.Type()]; ok {
+		return // already loaded
+	}
+
+	m := make(map[string]fullTypeRef)
+
+	c.initFields("", rval, m, make([]int, 0))
+
+	c.implDataTypeMap[rval.Type()] = m
+}
+
+func (c *Coll[TData]) init() {
+
+	example := *new(TData)
+
+	datatype := reflect.TypeOf(&example).Elem()
+
+	if datatype.Kind() == reflect.Interface {
+
+		c.isInterfaceDataType = true
+
+		c.dataTypeMap = make(map[string]fullTypeRef)
+		c.implDataTypeMap = make(map[reflect.Type]map[string]fullTypeRef)
+	} else {
+
+		c.isInterfaceDataType = false
+
+		c.dataTypeMap = make(map[string]fullTypeRef)
+		c.implDataTypeMap = make(map[reflect.Type]map[string]fullTypeRef)
+
+		v := reflect.ValueOf(example)
+		c.initFields("", v, c.dataTypeMap, make([]int, 0))
+
+	}
+
+}
+
+func (c *Coll[TData]) initFields(prefix string, rval reflect.Value, m map[string]fullTypeRef, idxarr []int) {
+
+	rtyp := rval.Type()
+
+	for i := 0; i < rtyp.NumField(); i++ {
+
+		rsfield := rtyp.Field(i)
+		rvfield := rval.Field(i)
+
+		if !rsfield.IsExported() {
+			continue
+		}
+
+		bsontags := make([]string, 0)
+		bsonkey, found := rsfield.Tag.Lookup("bson")
+		if !found {
+			continue
+		}
+		if strings.Contains(bsonkey, ",") {
+			bsontags = strings.Split(bsonkey[strings.Index(bsonkey, ",")+1:], ",")
+			bsonkey = bsonkey[:strings.Index(bsonkey, ",")]
+		}
+		if bsonkey == "-" {
+			continue
+		}
+
+		if bsonkey == "" {
+			bsonkey = rsfield.Name
+		}
+
+		fullKey := prefix + bsonkey
+
+		newIdxArr := langext.ArrCopy(idxarr)
+		newIdxArr = append(newIdxArr, i)
+
+		if langext.InArray("inline", bsontags) && rvfield.Kind() == reflect.Struct {
+
+			// pass-through field
+			c.initFields(prefix, rvfield, m, newIdxArr)
+
+		} else {
+
+			if rvfield.Type().Kind() == reflect.Pointer {
+
+				m[fullKey] = fullTypeRef{
+					IsPointer:      true,
+					RealType:       rvfield.Type(),
+					Kind:           rvfield.Type().Elem().Kind(),
+					Type:           rvfield.Type().Elem(),
+					UnderlyingType: reflectext.Underlying(rvfield.Type().Elem()),
+					Name:           rsfield.Name,
+					Index:          newIdxArr,
+				}
+
+			} else {
+
+				m[fullKey] = fullTypeRef{
+					IsPointer:      false,
+					RealType:       rvfield.Type(),
+					Kind:           rvfield.Type().Kind(),
+					Type:           rvfield.Type(),
+					UnderlyingType: reflectext.Underlying(rvfield.Type()),
+					Name:           rsfield.Name,
+					Index:          newIdxArr,
+				}
+
+			}
+
+			if rvfield.Kind() == reflect.Struct {
+				c.initFields(fullKey+".", rvfield, m, newIdxArr)
+			}
+
+		}
+
+	}
+
+}
+
+func (c *Coll[TData]) getTokenValueAsMongoType(value string, fieldName string) (any, error) {
+
+	fref, err := c.getFieldType(fieldName)
+	if err != nil {
+		return nil, err
+	}
+
+	pss := reflectext.PrimitiveStringSerializer{}
+
+	return pss.ValueFromString(value, fref.RealType)
+
+}
+
+func (c *Coll[TData]) getFieldValueAsTokenString(entity TData, fieldName string) (string, error) {
+
+	realValue, err := c.getFieldValue(entity, fieldName)
+	if err != nil {
+		return "", err
+	}
+
+	pss := reflectext.PrimitiveStringSerializer{}
+
+	return pss.ValueToString(realValue)
+
+}
+
+func (c *Coll[TData]) getFieldType(fieldName string) (fullTypeRef, error) {
+	if c.isInterfaceDataType {
+
+		for _, m := range c.implDataTypeMap {
+			if r, ok := m[fieldName]; ok {
+				return r, nil
+			}
+		}
+
+		return fullTypeRef{}, errors.New("unknown field: '" + fieldName + "' (in any impl)")
+
+	} else {
+
+		if r, ok := c.dataTypeMap[fieldName]; ok {
+			return r, nil
+		} else {
+			return fullTypeRef{}, errors.New("unknown field: '" + fieldName + "'")
+		}
+
+	}
+
+}
+
+func (c *Coll[TData]) getFieldValue(data TData, fieldName string) (any, error) {
+	if c.isInterfaceDataType {
+
+		rval := reflect.ValueOf(data)
+		for rval.Type().Kind() == reflect.Pointer {
+			rval = rval.Elem()
+		}
+
+		if m, ok := c.implDataTypeMap[rval.Type()]; ok {
+			if fref, ok := m[fieldName]; ok {
+				rval := reflect.ValueOf(data)
+				return rval.FieldByIndex(fref.Index).Interface(), nil
+			} else {
+				return nil, errors.New("unknown bson field '" + fieldName + "' in type '" + rval.Type().String() + "'")
+			}
+		} else {
+			return nil, errors.New("unknown TData type: '" + rval.Type().String() + "'")
+		}
+
+	} else {
+
+		if fref, ok := c.dataTypeMap[fieldName]; ok {
+			rval := reflect.ValueOf(data)
+			return rval.FieldByIndex(fref.Index).Interface(), nil
+		} else {
+			return nil, errors.New("unknown bson field '" + fieldName + "'")
+		}
+
+	}
+}

wmo/reflection_test.go

@@ -0,0 +1,226 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"gogs.mikescher.com/BlackForestBytes/goext/rfctime"
+	"gogs.mikescher.com/BlackForestBytes/goext/timeext"
+	"gogs.mikescher.com/BlackForestBytes/goext/tst"
+	"reflect"
+	"testing"
+	"time"
+)
+
+func TestReflectionGetFieldType(t *testing.T) {
+
+	type IDType string
+
+	type TestData struct {
+		ID    IDType    `bson:"_id"`
+		CDate time.Time `bson:"cdate"`
+		Sub   struct {
+			A string `bson:"a"`
+		} `bson:"sub"`
+		Str   string                  `bson:"str"`
+		Ptr   *int                    `bson:"ptr"`
+		MDate rfctime.RFC3339NanoTime `bson:"mdate"`
+	}
+
+	coll := W[TestData](&mongo.Collection{})
+
+	coll.init()
+
+	t0 := time.Now()
+	t1 := rfctime.NewRFC3339Nano(t0)
+
+	d := TestData{
+		ID:    "1",
+		CDate: t0,
+		Sub: struct {
+			A string `bson:"a"`
+		}{
+			A: "2",
+		},
+		Str:   "3",
+		Ptr:   langext.Ptr(4),
+		MDate: t1,
+	}
+
+	gft := func(k string) fullTypeRef {
+		v, err := coll.getFieldType(k)
+		if err != nil {
+			t.Errorf("%s: %v", "failed to getFieldType", err)
+		}
+		return v
+	}
+
+	gfv := func(k string) any {
+		v, err := coll.getFieldValue(d, k)
+		if err != nil {
+			t.Errorf("%s: %v", "failed to getFieldType", err)
+		}
+		return v
+	}
+
+	tst.AssertEqual(t, gft("_id").Kind.String(), "string")
+	tst.AssertEqual(t, gft("_id").Type.String(), "wmo.IDType")
+	tst.AssertEqual(t, gft("_id").Name, "ID")
+	tst.AssertEqual(t, gft("_id").IsPointer, false)
+	tst.AssertEqual(t, gfv("_id").(IDType), "1")
+
+	tst.AssertEqual(t, gft("cdate").Kind.String(), "struct")
+	tst.AssertEqual(t, gft("cdate").Type.String(), "time.Time")
+	tst.AssertEqual(t, gft("cdate").Name, "CDate")
+	tst.AssertEqual(t, gft("cdate").IsPointer, false)
+	tst.AssertEqual(t, gfv("cdate").(time.Time), t0)
+
+	tst.AssertEqual(t, gft("sub.a").Kind.String(), "string")
+	tst.AssertEqual(t, gft("sub.a").Type.String(), "string")
+	tst.AssertEqual(t, gft("sub.a").Name, "A")
+	tst.AssertEqual(t, gft("sub.a").IsPointer, false)
+	tst.AssertEqual(t, gfv("sub.a").(string), "2")
+
+	tst.AssertEqual(t, gft("str").Kind.String(), "string")
+	tst.AssertEqual(t, gft("str").Type.String(), "string")
+	tst.AssertEqual(t, gft("str").Name, "Str")
+	tst.AssertEqual(t, gft("str").IsPointer, false)
+	tst.AssertEqual(t, gfv("str").(string), "3")
+
+	tst.AssertEqual(t, gft("ptr").Kind.String(), "int")
+	tst.AssertEqual(t, gft("ptr").Type.String(), "int")
+	tst.AssertEqual(t, gft("ptr").Name, "Ptr")
+	tst.AssertEqual(t, gft("ptr").IsPointer, true)
+	tst.AssertEqual(t, *gfv("ptr").(*int), 4)
+}
+
+func TestReflectionGetTokenValueAsMongoType(t *testing.T) {
+
+	type IDType string
+
+	type TestData struct {
+		ID    IDType    `bson:"_id"`
+		CDate time.Time `bson:"cdate"`
+		Sub   struct {
+			A string `bson:"a"`
+		} `bson:"sub"`
+		Str   string                  `bson:"str"`
+		Ptr   *int                    `bson:"ptr"`
+		Num   int                     `bson:"num"`
+		MDate rfctime.RFC3339NanoTime `bson:"mdate"`
+	}
+
+	coll := W[TestData](&mongo.Collection{})
+
+	coll.init()
+
+	gtvasmt := func(value string, fieldName string) any {
+		v, err := coll.getTokenValueAsMongoType(value, fieldName)
+		if err != nil {
+			t.Errorf("%s", "failed to getTokenValueAsMongoType")
+			t.Errorf("%v+", err)
+		}
+		return v
+	}
+
+	tx, err := time.Parse(time.RFC3339Nano, "2009-11-10T23:00:00Z")
+	if err != nil {
+		t.Errorf("%v", err)
+	}
+
+	tst.AssertEqual(t, gtvasmt("hello", "str").(string), "hello")
+	tst.AssertEqual(t, gtvasmt("4", "num").(int), 4)
+	tst.AssertEqual(t, gtvasmt("asdf", "_id").(IDType), "asdf")
+	tst.AssertEqual(t, gtvasmt("", "ptr").(*int), nil)
+	tst.AssertEqual(t, *(gtvasmt("123", "ptr").(*int)), 123)
+	tst.AssertEqual(t, gtvasmt("2009-11-10T23:00:00Z", "cdate").(time.Time), tx)
+	tst.AssertEqual(t, gtvasmt("2009-11-10T23:00:00Z", "mdate").(rfctime.RFC3339NanoTime), rfctime.NewRFC3339Nano(tx))
+}
+
+func TestReflectionGetFieldValueAsTokenString(t *testing.T) {
+
+	type IDType string
+
+	type TestData struct {
+		ID    IDType    `bson:"_id"`
+		CDate time.Time `bson:"cdate"`
+		Sub   struct {
+			A string `bson:"a"`
+		} `bson:"sub"`
+		Str   string                  `bson:"str"`
+		Ptr   *int                    `bson:"ptr"`
+		Num   int                     `bson:"num"`
+		Ptr2  *int                    `bson:"ptr2"`
+		FFF   float64                 `bson:"fff"`
+		MDate rfctime.RFC3339NanoTime `bson:"mdate"`
+	}
+
+	coll := W[TestData](&mongo.Collection{})
+
+	coll.init()
+
+	t0 := time.Date(2000, 1, 1, 12, 0, 0, 0, timeext.TimezoneBerlin)
+	t1 := rfctime.NewRFC3339Nano(t0)
+
+	d := TestData{
+		ID:    "1",
+		CDate: t0,
+		MDate: t1,
+		Sub: struct {
+			A string `bson:"a"`
+		}{
+			A: "2",
+		},
+		Str:  "3",
+		Ptr:  langext.Ptr(4),
+		Num:  22,
+		FFF:  22.5,
+		Ptr2: nil,
+	}
+
+	gfvats := func(value TestData, fieldName string) string {
+		v, err := coll.getFieldValueAsTokenString(value, fieldName)
+		if err != nil {
+			t.Errorf("%s: %v", "failed to getTokenValueAsMongoType", err)
+		}
+		return v
+	}
+
+	tst.AssertEqual(t, gfvats(d, "str"), "3")
+	tst.AssertEqual(t, gfvats(d, "num"), "22")
+	tst.AssertEqual(t, gfvats(d, "_id"), "1")
+	tst.AssertEqual(t, gfvats(d, "ptr"), "4")
+	tst.AssertEqual(t, gfvats(d, "ptr2"), "")
+	tst.AssertEqual(t, gfvats(d, "fff"), "22.5")
+	tst.AssertEqual(t, gfvats(d, "cdate"), t0.Format(time.RFC3339Nano))
+	tst.AssertEqual(t, gfvats(d, "mdate"), t0.Format(time.RFC3339Nano))
+}
+
+func TestReflectionWithInterface(t *testing.T) {
+
+	type TestData struct {
+		ID    primitive.ObjectID `bson:"_id"`
+		CDate time.Time          `bson:"cdate"`
+	}
+
+	type TestInterface interface {
+	}
+
+	coll1 := W[TestInterface](&mongo.Collection{})
+
+	tst.AssertTrue(t, coll1.coll != nil)
+	tst.AssertEqual(t, 0, len(coll1.implDataTypeMap))
+
+	df := func(ctx context.Context, dec Decodable) (TestInterface, error) {
+		return TestData{}, nil
+	}
+
+	coll2 := W[TestInterface](&mongo.Collection{}).WithDecodeFunc(df, TestData{})
+
+	tst.AssertTrue(t, coll2.coll != nil)
+	tst.AssertEqual(t, 1, len(coll2.implDataTypeMap))
+
+	tst.AssertEqual(t, "ID", coll2.implDataTypeMap[reflect.TypeOf(TestData{})]["_id"].Name)
+	tst.AssertEqual(t, "CDate", coll2.implDataTypeMap[reflect.TypeOf(TestData{})]["cdate"].Name)
+}