This is more or less the idea behind
https://code.djangoproject.com/ticket/2 except that the custom
error_messages would be defined in ModelForm rather than Model. In my opinion,
Model is a terrible place to define user-facing strings such as help_text or
error_messages, at best useful to s
Django docs state that a ModelForm will automatically set some field
attributes for auto generated form fields. Those attributes are limited to :
'required', 'verbose_name', 'help_text', and 'choices' (according to
https://docs.djangoproject.com/en/dev/topics/forms/modelforms/#django.forms.Model
