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Updated recommendation for testing keyword arg in custom fields.
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@ -247,7 +247,7 @@ You can't modify the number of positional arguments in an already migrated
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custom field without raising a ``TypeError``. The old migration will call the
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modified ``__init__`` method with the old signature. So if you need a new
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argument, please create a keyword argument and add something like
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``assert kwargs.get('argument_name') is not None`` in the constructor.
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``assert 'argument_name' in kwargs`` in the constructor.
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.. _using-managers-in-migrations:
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