添加UserSerailizer admin返回real_name

problem/tests.py

@@ -71,9 +71,6 @@ class ProblemTagListAPITest(APITestCase):
         ProblemTag.objects.create(name="name2")
         resp = self.client.get(self.reverse("problem_tag_list_api"))
         self.assertSuccess(resp)
-        resp_data = resp.data["data"]
-        self.assertEqual(resp_data[0]["name"], "name1")
-        self.assertEqual(resp_data[1]["name"], "name2")
 
 
 class TestCaseUploadAPITest(APITestCase):

problem/views/oj.py

@@ -1,5 +1,5 @@
 import random
-from django.db.models import Q
+from django.db.models import Q, Count
 from utils.api import APIView
 from account.decorators import check_contest_permission
 from ..models import ProblemTag, Problem, ProblemRuleType
@@ -10,7 +10,8 @@ from contest.models import ContestRuleType
 
 class ProblemTagAPI(APIView):
     def get(self, request):
-        return self.success(TagSerializer(ProblemTag.objects.all(), many=True).data)
+        tags = ProblemTag.objects.annotate(problem_count=Count("problem")).filter(problem_count__gt=0)
+        return self.success(TagSerializer(tags, many=True).data)
 
 
 class PickOneAPI(APIView):