v0.0.301 pagination (page+limit) support in wmo

pagination/filter.go

@@ -0,0 +1,11 @@
+package pagination
+
+import (
+	"go.mongodb.org/mongo-driver/mongo"
+	ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
+)
+
+type Filter interface {
+	FilterQuery() mongo.Pipeline
+	Pagination() (string, ct.SortDirection)
+}

pagination/pagination.go

@@ -0,0 +1,16 @@
+package pagination
+
+type Pagination struct {
+	Page             int `json:"page"`            // page (first page == 1)
+	Limit            int `json:"limit"`           // max-page-size
+	TotalPages       int `json:"totalPages"`      // total page-count
+	TotalItems       int `json:"totalItems"`      // total items-count
+	CurrentPageCount int `json:"currntPageCount"` // item-count in current page ( == len(data) )
+}
+
+func CalcPaginationTotalPages(totalItems int, limit int) int {
+	if totalItems == 0 {
+		return 0
+	}
+	return 1 + (totalItems-1)/limit
+}