form.py 文件源码

def formfield_for_choice_field(self, db_field, **kwargs):
        """
        Get a form Field for a database Field that has declared choices.
        """
        from django.contrib.admin import widgets

        # If the field is named as a radio_field, use a RadioSelect
        if db_field.name in self.radio_fields:
            # Avoid stomping on custom widget/choices arguments.
            if 'widget' not in kwargs:
                kwargs['widget'] = widgets.AdminRadioSelect(attrs={
                    'class': get_ul_class(self.radio_fields[db_field.name]),
                })
            if 'choices' not in kwargs:
                kwargs['choices'] = db_field.get_choices(
                    include_blank=db_field.blank,
                    blank_choice=[('', _('None'))]
                )
        return db_field.formfield(**kwargs)