class AddAdForm:
    def __init__(self, category_pk, add_contact_mixin=False):
        self.category = Category.objects.get(pk=category_pk)
        self.form_classes = [(getattr(forms_module, c).__name__.split('_')[1], getattr(forms_module, c))
                             for c in dir(forms_module) if c.startswith('Add_')]
        self.add_contact_mixin = add_contact_mixin

    def create(self, *args, **kwargs):
        classes = [c[1] for c in self.form_classes if self.category.ad_class == c[0]]
        if len(classes) == 0:
            raise NoClassFormForCategory(self.category)
        class_obj = classes[0]

        bases = (class_obj,)

        if self.add_contact_mixin and ContactsFormBBMixin not in class_obj.__bases__:
            bases = bases + (ContactsFormBBMixin,)

        class_obj = type('AddForm', bases, {})
        # class_obj = type('__'.join([c.__name__ for c in bases]), bases, {})

        return class_obj(*args, **kwargs)