I have what I assumed to be a pretty simple serializer setup, but when I attempt to PUT data to my API, I get the following error:

我假设是一个非常简单的序列化器设置，但是当我尝试将数据放入API时，我得到以下错误:

ValueError: instance should be a queryset or other iterable with many=True

ValueError:实例应该是一个queryset或其他具有many=True的可迭代

Here's the view:

视图:

class QuizAPI(generics.RetrieveUpdateDestroyAPIView):
    model = Quiz
    serializer_class = QuizSerializer
    lookup_field = 'activity_id'

and the serializers:

序列化器:

class MediaResourceSerializer(serializers.ModelSerializer):
    owner = serializers.PrimaryKeyRelatedField(many=False, read_only=True)

    class Meta:
        model = MediaResource
        fields = ('owner', 'name', 'type', 'url')

class AnswerSerializer(serializers.ModelSerializer):
    class Meta:
        model = Answer
        fields = ('text','is_correct','order')

class QuestionSerializer(serializers.ModelSerializer):
    answers = AnswerSerializer(many=True, required=False)
    resources = MediaResourceSerializer(many=True, required=False)

    class Meta:
        model = Question
        fields = ( 
            'question_id', 
            'type', 
            'order', 
            'question_text', 
            'explanation', 
            'resources', 
            'grading_weight', 
            'answers' 
        )

class QuizSerializer(serializers.ModelSerializer):
    questions = QuestionSerializer(many=True, required=False)
    created_by = serializers.PrimaryKeyRelatedField(many=False, read_only=True)

    class Meta:
        model = Quiz
        fields = (
            'activity_id', 
            'name',  
            'is_hidden', 
            'created_by', 
            'created_date', 
            'last_updated', 
            'sharable', 
            'questions'
        )

If I comment out the 'questions' field from QuizSerializer it runs just fine (of course without question data).

如果我将QuizSerializer中的“问题”字段注释掉，它就会运行得很好(当然，没有问题数据)。

** Edit: Here's the PUT call payload:

**编辑:这是PUT调用有效载荷:

activity_id: 4
created_by: 1
created_date: "2013-07-29T20:39:47.981Z"
is_hidden: false
last_updated: null
name: "This is only a test"
questions: []
sharable: true

1 个解决方案