formset from a list of form?

Using Django Forms & APIs
9

Actually, I think this relates directly to another thread from just a couple days ago - Creating Model Form with python code in form - #8 by KenWhitesell

(Now, while I could hypothesize the possibility of creating a formset consisting of different forms, perhaps using the get_form_kwargs parameter to create a formset in an ABABABAB pattern, I’ve never seen it done and I have no idea what problems would be encountered along the way.)

This fits into the category of different forms in a formset, and clearly there is some “friction” involved here.

Now, in the simplified case, given a trivial model form:

class SomeModelForm(forms.ModelForm):
    class Meta:
        model = SomeModel
        fields = '__all__'
    def __init__(self, *args, **kwargs):
        instance = kwargs.get('instance', None)
        super().__init__(*args, **kwargs)

When this form is instantiated, the variable instance will have the instance of the model associated with it.

If you then modify self.fields after the super() call in __init__, you can make your desired changes.

This means if you then have:

SomeModelFormset = modelformset_factory(SomeModel, form=SomeModelForm, extra=0)
some_model_formset = SomeModelFormset(...)

You will have generated your desired forms.

Edit: I was wrong here.

Validation is not performed until something else happens causing the validation to be performed, such as calling is_valid. It does not happen during __init__.