Use `formfield_for_foreignkey()` instead of `get_form()`.
Use `formfield_for_foreignkey()` instead of `get_form()`.

Avoid problems that can easily occur when subclassing a form created with
`modelform_factory()` by not messing with the form directly at all.

ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/django-icekit