Explicitly list fields when defining form from model.
Explicitly list fields when defining form from model.

This only changes one test (`` test_richtext_widget``), but here's a
short article that may explain why ``fields`` or ``exclude`` becomes
mandatory argument to ``modelform_factory`` and why you actually may
want to explicitly list fields to be available in forms:
http://blog.mhartl.com/2008/09/21/mass-assignment-in-rails-applications/

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