Initial commit

core/server/database/scope/paginate.go

@@ -0,0 +1,55 @@
+package scope
+
+import (
+	"gorm.io/gorm"
+	"pet-house.com/core/helper/str"
+)
+
+// PaginateScope 	return paginate scope for gorm
+// - page 			int
+// - pageSize 	int
+// - sort 			string
+// - orderBy 		string
+func PaginateScope(page, pageSize int, sort, orderBy string) func(db *gorm.DB) *gorm.DB {
+	return func(db *gorm.DB) *gorm.DB {
+		pageSize := getPageSize(pageSize)
+		offset := getOffset(page, pageSize)
+		return db.Order(getOrderBy(sort, orderBy)).Offset(offset).Limit(pageSize)
+	}
+}
+
+// getOffset
+func getOffset(page, pageSize int) int {
+	if page == 0 {
+		page = 1
+	}
+	offset := (page - 1) * pageSize
+	if page < 0 {
+		offset = -1
+	}
+	return offset
+}
+
+// getPageSize
+func getPageSize(pageSize int) int {
+	switch {
+	case pageSize > 100:
+		pageSize = 100
+	case pageSize < 0:
+		pageSize = -1
+	case pageSize == 0:
+		pageSize = 10
+	}
+	return pageSize
+}
+
+// getOrderBy
+func getOrderBy(sort, orderBy string) string {
+	if sort == "" {
+		sort = "desc"
+	}
+	if orderBy == "" {
+		orderBy = "created_at"
+	}
+	return str.Join(orderBy, " ", sort)
+}