Django serializer returning empty string

Question

I was hoping somebody could advise my on this: my serializer returns an empty string, despite the data being correct.

def foo(self, request, uuid=None):
        data = JSONParser().parse(request)
        logger.error(data)
        serializer = MySerializer(data=data)
        logger.error(serializer.data) #Empty JSON string 
        something.bar(serializer.data, self.request.user)
        return Response(status=status.HTTP_201_CREATED)

MySerializer:

class MySerializer(serializers.Serializer):

    foo1 = serializers.BooleanField()
    foo2 = serializers.CharField(max_length=200, required=True)
    foo3 = serializers.BooleanField()

    class Meta:
        fields = ('foo1',
                  'foo2',
                  'foo3')

The data returned by the serializer from serializer.data: foo1: '', foo2: False, foo3: False

Where am I going wrong?

Joey Wilhelm · Accepted Answer · 2015-07-09 23:21:55Z

3

I believe your answer comes directly from rest_framework/serializers.py:

@property
def data(self):
    if hasattr(self, 'initial_data') and not hasattr(self, '_validated_data'):
        msg = (
            'When a serializer is passed a `data` keyword argument you '
            'must call `.is_valid()` before attempting to access the '
            'serialized `.data` representation.\n'
            'You should either call `.is_valid()` first, '
            'or access `.initial_data` instead.'
        )
        raise AssertionError(msg)

answered Jul 9, 2015 at 23:21

Joey Wilhelm

5,8291 gold badge30 silver badges43 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Rahul Gupta · Accepted Answer · 2015-07-10 04:24:10Z

2

You need to call .is_valid() on the serializer first with the data and then access the serialized data(which Joey also pointed out).

def foo(self, request, uuid=None):
    data = JSONParser().parse(request)
    logger.error(data)
    serializer = MySerializer(data=data)
    serializer.is_valid(raise_exception=True) # explicitly call .is_valid() first 
    logger.error(serializer.data) #Empty JSON string  
    something.bar(serializer.data, self.request.user)
    return Response(status=status.HTTP_201_CREATED)

answered Jul 10, 2015 at 4:24

Rahul Gupta

48k12 gold badges120 silver badges131 bronze badges

Collectives™ on Stack Overflow

Django serializer returning empty string

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related