for drvid on #django IRC.

oh_formsets.py

class UserFormSet(BaseInlineFormSet):  # or whatever. They all have __init__ and _construct_form and _empty_form
    def __init__(self, user, *args, **kwargs):
        self.user = user
        super(UserFormSet, self).__init__(*args, **kwargs)

    # Note: in master, at least, this is is all unnecessary, because there's a 
    # get_form_kwargs method you can use instead of either of these methods.
    def _construct_form(self, i, **kwargs):
        kwargs.update(user=self.user)
        return super(UserFormSet, self)._construct_form(i, **kwargs)
    
    def _get_empty_form(self, **kwargs):
        kwargs.update(user=self.user)
        return super(UserFormSet, self)._get_empty_form(**kwargs)
    empty_form = property(_get_empty_form)
    
formset = inlineformset_factory(parent_model=Something, model=Something, formset=UserFormSet, form=MyMagicForm)