Add list of required fields to ModelForm.

[ahmad]

Hi,
We can add a new field to formbase class like 'fields' or 'exclude' called 'required'.
Any field is in that list, must be completed for submitting and validating.
I think it's not so difficult.
How do I can do that with contributing in django?
It's so good if we can impliment that.

[Mariusz Felisiak]

Thanks for this ticket, however to make this really useful we should make changes also in modelform_factory() and probably add a new parameter to Meta. I'm going to won't fix this to for reasons described in #17924 and https://code.djangoproject.com/ticket/20000#comment:9. You can achieve this by overriding __init__ and access self.fields directly. Please open a thread on the DevelopersMailingList if you don't agree.

Related with #22925.