[Feature] 权限管理-> 远程应用 添加 api (#4040)

* [Feature] 权限管理-> 远程应用 添加 api

* [Feature] 添加 RelationMixin

apps/perms/serializers/database_app_permission.py

@@ -1,6 +1,6 @@
 # coding: utf-8
 #
-
+from django.db.models import Count
 from rest_framework import serializers
 
 from common.fields import StringManyToManyField
@@ -27,13 +27,22 @@ class DatabaseAppPermissionSerializer(BulkOrgResourceModelSerializer):
 
 
 class DatabaseAppPermissionListSerializer(BulkOrgResourceModelSerializer):
-    users = StringManyToManyField(many=True, read_only=True)
-    user_groups = StringManyToManyField(many=True, read_only=True)
-    database_apps = StringManyToManyField(many=True, read_only=True)
-    system_users = StringManyToManyField(many=True, read_only=True)
-    is_valid = serializers.BooleanField()
     is_expired = serializers.BooleanField()
 
     class Meta:
         model = models.DatabaseAppPermission
-        fields = '__all__'
+        fields = [
+            'id', 'name', 'comment', 'is_active', 'users_amount', 'user_groups_amount',
+            'date_start', 'date_expired', 'is_valid', 'database_apps_amount', 'system_users_amount',
+            'created_by', 'date_created', 'is_expired'
+        ]
+
+    @classmethod
+    def setup_eager_loading(cls, queryset):
+        """ Perform necessary eager loading of data. """
+        queryset = queryset.annotate(
+            users_amount=Count('users', distinct=True), user_groups_amount=Count('user_groups', distinct=True),
+            database_apps_amount=Count('database_apps', distinct=True),
+            system_users_amount=Count('system_users', distinct=True)
+        )
+        return queryset