[Update] 修改user group relations api

apps/users/serializers/realtion.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+#
+from rest_framework import serializers
+
+from ..models import User
+
+__all__ = ['UserUserGroupRelationSerializer']
+
+
+class UserUserGroupRelationSerializer(serializers.ModelSerializer):
+    user_name = serializers.CharField(read_only=True)
+    usergroup_name = serializers.CharField(read_only=True)
+
+    class Meta:
+        model = User.groups.through
+        fields = ['id', 'user', 'user_name', 'usergroup', 'usergroup_name']