fix

account/views/oj.py

@@ -83,12 +83,13 @@ class UserProfileAPI(APIView):
 class Metrics(APIView):
     def get(self, request):
         userid = request.GET.get("userid")
-        submissions = Submission.objects.filter(user_id=userid)
-        if len(submissions) == 0:
+        submissions = Submission.objects.filter(user_id=userid, contest_id__isnull=True)
+        if submissions.count() == 0:
             return self.error("暂无提交")
         else:
             latest_submission = submissions.first()
             last_submission = submissions.last()
+            if last_submission and latest_submission:
                 return self.success(
                     {
                         "now": timezone.now(),
@@ -96,6 +97,8 @@ class Metrics(APIView):
                         "first": last_submission.create_time,
                     }
                 )
+            else:
+                return self.error("暂无提交")
 
 
 class AvatarUploadAPI(APIView):