修改problemAdminAPIView，添加新建问题时对问题可见/不可见的支持

problem/serizalizers.py

@@ -31,6 +31,7 @@ class CreateProblemSerializer(serializers.Serializer):
     difficulty = serializers.IntegerField()
     tags = serializers.ListField(child=serializers.CharField(max_length=10))
     hint = serializers.CharField(max_length=3000, allow_blank=True)
+    visible = visible = serializers.BooleanField()
 
 
 class ProblemTagSerializer(serializers.ModelSerializer):

problem/views.py

@@ -59,7 +59,8 @@ class ProblemAdminAPIView(APIView):
                                              memory_limit=data["memory_limit"],
                                              difficulty=data["difficulty"],
                                              created_by=request.user,
-                                             hint=data["hint"])
+                                             hint=data["hint"],
+                                             visible=data["visible"])
             for tag in data["tags"]:
                 try:
                     tag = ProblemTag.objects.get(name=tag)