Demonstrate what this change in Django would allow users to do: https://github.com/jpic/django/commit/d102f362f3c1ceaf2d5224d71f788c0821a481ae Read the full article here: http://blog.yourlabs.org/post/140742987608/porting-modelform-enhancements-from

change_default_formfield_in_apps.py

class TestApp(AppConfig): 
    name = 'select2_one_to_one' 

    def ready(self): 
        model = self.get_model('TestModel') 
        # Perhaps that's the kind of nice place to override this kind of things 
        model._meta.get_field('test').formfield_defaults['widget'] = forms.RadioSelect 
        # django-autocomplete-light users would execute something like: 
        model._meta.get_field('test').formfield_defaults['widget'] = autocomplete.Select2(url='my_autocomplete_url')

change_default_formfield_in_models.py

class TestModel(models.Model): 
    name = models.CharField(max_length=200) 

    test = models.OneToOneField( 
        'self', 
        null=True, 
        blank=True, 
        related_name='related_test_models', 
        # This seems like it would always be useful 
        formfield_defaults={ 
            'widget': forms.RadioSelect 
        } 
    )