update to django 2.0

submission/models.py

@@ -22,8 +22,8 @@ class JudgeStatus:
 
 class Submission(models.Model):
     id = models.TextField(default=rand_str, primary_key=True, db_index=True)
-    contest = models.ForeignKey(Contest, null=True)
-    problem = models.ForeignKey(Problem)
+    contest = models.ForeignKey(Contest, null=True, on_delete=models.CASCADE)
+    problem = models.ForeignKey(Problem, on_delete=models.CASCADE)
     create_time = models.DateTimeField(auto_now_add=True)
     user_id = models.IntegerField(db_index=True)
     username = models.TextField()

submission/serializers.py

@@ -46,6 +46,6 @@ class SubmissionListSerializer(serializers.ModelSerializer):
 
     def get_show_link(self, obj):
         # 没传user或为匿名user
-        if self.user is None or not self.user.is_authenticated():
+        if self.user is None or not self.user.is_authenticated:
             return False
         return obj.check_user_permission(self.user)

submission/views/oj.py

@@ -198,6 +198,6 @@ class SubmissionExistsAPI(APIView):
     def get(self, request):
         if not request.GET.get("problem_id"):
             return self.error("Parameter error, problem_id is required")
-        return self.success(request.user.is_authenticated() and
+        return self.success(request.user.is_authenticated and
                             Submission.objects.filter(problem_id=request.GET["problem_id"],
                                                       user_id=request.user.id).exists())