validated_data empty when is_valid() is True

[David Binetti]

I'm perplexed and can't figure out what I'm missing.  I've stripped a ModelSerializer down to just the PK (a UUID) and am trying to create a serialized object through the data= kwarg.  I then call is_valid() which returns true, but the validated_data is empty.  what am I doing wrong?

```

class GroupSerializer(serializers.ModelSerializer):

    class Meta:

        model = Group

        fields = [

            'id',

        ]

In [17]: data = {'id': 'fffd128a-8fc0-4487-b297-f952c38c1d09'}  

    ...: serialized = GroupSerializer(data=data)  

    ...:                                                                               

In [18]: serialized.initial_data                                                       

Out[18]: {'id': 'fffd128a-8fc0-4487-b297-f952c38c1d09'}

In [19]: serialized.is_valid()                                                         

Out[19]: True

In [20]: serialized.validated_data                                                     

Out[20]: OrderedDict()

```

[Carlton Gibson]

Can you print(serialized) in the shell?

Auto generated ID fields are read-only I think. 

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