feat: add count function into interface and implement it

Author: VladPetriv

database/memory/count.go

@@ -0,0 +1,18 @@
+package memory
+
+import (
+	"github.com/staticbackendhq/core/model"
+)
+
+func (m *Memory) Count(auth model.Auth, dbName, col string, filter map[string]interface{}) (int64, error) {
+	list, err := all[map[string]any](m, dbName, col)
+	if err != nil {
+		return -1, err
+	}
+
+	list = secureRead(auth, col, list)
+
+	filtered := filterByClauses(list, filter)
+
+	return int64(len(filtered)), nil
+}

database/mongo/count.go

@@ -0,0 +1,23 @@
+package mongo
+
+import (
+	"github.com/staticbackendhq/core/model"
+)
+
+func (mg *Mongo) Count(auth model.Auth, dbName, col string, filter map[string]interface{}) (count int64, err error) {
+	db := mg.Client.Database(dbName)
+
+	acctID, userID, err := parseObjectID(auth)
+	if err != nil {
+		return
+	}
+
+	secureRead(acctID, userID, auth.Role, col, filter)
+
+	count, err = db.Collection(model.CleanCollectionName(col)).CountDocuments(mg.Ctx, filter)
+	if err != nil {
+		return -1, err
+	}
+
+	return count, nil
+}

database/persister.go

@@ -142,4 +142,6 @@ type Persister interface {
 	DeleteFile(dbName, fileID string) error
 	// ListAllFiles lists all file
 	ListAllFiles(dbName, accountID string) ([]model.File, error)
+	// Count returns the numbers of entries in a collection based on optional filters
+	Count(auth model.Auth, dbName, col string, filters map[string]interface{}) (int64, error)
 }

database/postgresql/count.go

@@ -0,0 +1,25 @@
+package postgresql
+
+import (
+	"fmt"
+
+	"github.com/staticbackendhq/core/model"
+)
+
+func (pg *PostgreSQL) Count(auth model.Auth, dbName, col string, filters map[string]interface{}) (count int64, err error) {
+	where := secureRead(auth, col)
+	where = applyFilter(where, filters)
+
+	query := fmt.Sprintf(`
+    SELECT COUNT(*)
+    FROM %s.%s
+    %s;
+    `, dbName, model.CleanCollectionName(col), where)
+
+	err = pg.DB.QueryRow(query, auth.AccountID, auth.UserID).Scan(&count)
+	if err != nil {
+		return -1, err
+	}
+
+	return count, nil
+}