Fixed #29901 -- Allowed overriding an autocomplete/raw_id_fields/radio_fields widget with ModelAdmin.get_formset().

django/contrib/admin/options.py

@@ -224,6 +224,7 @@ class BaseModelAdmin(metaclass=forms.MediaDefiningClass):
         """
         db = kwargs.get('using')
 
+        if 'widget' not in kwargs:
             if db_field.name in self.get_autocomplete_fields(request):
                 kwargs['widget'] = AutocompleteSelect(db_field.remote_field, self.admin_site, using=db)
             elif db_field.name in self.raw_id_fields:

tests/modeladmin/tests.py

@@ -437,6 +437,28 @@ class ModelAdminTests(TestCase):
             ['main_band', 'day', 'transport', 'id', 'DELETE']
         )
 
+    def test_raw_id_fields_widget_override(self):
+        """
+        The autocomplete_fields, raw_id_fields, and radio_fields widgets may
+        overridden by specifying a widget in get_formset().
+        """
+        class ConcertInline(TabularInline):
+            model = Concert
+            fk_name = 'main_band'
+            raw_id_fields = ('opening_band',)
+
+            def get_formset(self, request, obj=None, **kwargs):
+                kwargs['widgets'] = {'opening_band': Select}
+                return super().get_formset(request, obj, **kwargs)
+
+        class BandAdmin(ModelAdmin):
+            inlines = [ConcertInline]
+
+        ma = BandAdmin(Band, self.site)
+        band_widget = list(ma.get_formsets_with_inlines(request))[0][0]().forms[0].fields['opening_band'].widget
+        # Without the override this would be ForeignKeyRawIdWidget.
+        self.assertIsInstance(band_widget, Select)
+
     def test_queryset_override(self):
         # If the queryset of a ModelChoiceField in a custom form is overridden,
         # RelatedFieldWidgetWrapper doesn't mess that up.