When the default manager returns a queryset with a deferred field, the dumpdata command fails to produce importable data.
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Setup the environment
$ git clone https://github.com/cecedille1/DjangoBug.git . $ virtualenv . --python python3 $ source bin/activate $ pip install -r requirements.txt $ bug migrate $ bug loaddata initial
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Reproduce the bug
$ bug dumpdata [{"model": "my_bug.mymodel_deferred_an_expensive_value", "fields": {"value": "abc", "an_expensive_value": "dGhpcw=="}, "pk": 1}]>>
The name of the model is mymodel_deferred_an_expensive_value and Django wont be able to load it later.