Refactor the original db code.

object/syner_db_user.go

@@ -0,0 +1,30 @@
+// Copyright 2021 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package object
+
+func (syncer *Syncer) getUsers() []*User {
+	users := GetUsers(syncer.Organization)
+	return users
+}
+
+func (syncer *Syncer) getUserMap() ([]*User, map[string]*User) {
+	users := syncer.getUsers()
+
+	m := map[string]*User{}
+	for _, user := range users {
+		m[user.Name] = user
+	}
+	return users, m
+}