Migrations with custom fields fail

[digitalle]

I have some custom fields like:

class ProtectedForeignKey(models.ForeignKey):
    def __init__(self, *args, **kwargs):
        super(ProtectedForeignKey, self).__init__(*args, on_delete=models.PROTECT, **kwargs)

1.6 version worked fine.

1.7 validates and runs server also without problems.

But when I try to run syncdb for the first time I get error:

File "C:\Python27\lib\site-packages\django-1.7b4-py2.7.egg\django\core\management\commands\migrate.py", line 139, in handle
    ProjectState.from_apps(apps),
  File "C:\Python27\lib\site-packages\django-1.7b4-py2.7.egg\django\db\migrations\state.py", line 97, in from_apps
    model_state = ModelState.from_model(model)
  File "C:\Python27\lib\site-packages\django-1.7b4-py2.7.egg\django\db\migrations\state.py", line 164, in from_model
    e,
TypeError: Couldn't reconstruct field company on company.ListAddress: __init__() got multiple values for keyword argument 'on_delete'

This fix solved the problem:

class ProtectedForeignKey(models.ForeignKey):
    def __init__(self, *args, **kwargs):
        kwargs.setdefault('on_delete', models.PROTECT)
        super(ProtectedForeignKey, self).__init__(*args, **kwargs)

but I have another couple of custom fields which set default kwargs like "validators"
and syncdb fails on that fields with the same error but different key argument.

[Andrew Godwin]

Please read ​https://docs.djangoproject.com/en/dev/releases/1.7/#new-method-on-field-subclasses - custom fields need changing for 1.7.