Method formfield_for_foreignkey

django/contrib/admin/options.py:315–345

Get a form Field for a ForeignKey.

(self, db_field, request, **kwargs)

        return None

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        """
        Get a form Field for a ForeignKey.
        """
        db = kwargs.get("using")

        if "widget" not in kwargs:
            if db_field.name in self.get_autocomplete_fields(request):
                kwargs["widget"] = AutocompleteSelect(
                    db_field, self.admin_site, using=db
                )
            elif db_field.name in self.raw_id_fields:
                kwargs["widget"] = widgets.ForeignKeyRawIdWidget(
                    db_field.remote_field, self.admin_site, using=db
                )
            elif db_field.name in self.radio_fields:
                kwargs["widget"] = widgets.AdminRadioSelect(
                    attrs={
                        "class": get_ul_class(self.radio_fields[db_field.name]),
                    }
                )
                kwargs["empty_label"] = (
                    kwargs.get("empty_label", _("None")) if db_field.blank else None
                )

        if "queryset" not in kwargs:
            queryset = self.get_field_queryset(db, db_field, request)
            if queryset is not None:
                kwargs["queryset"] = queryset

        return db_field.formfield(**kwargs)

    def formfield_for_manytomany(self, db_field, request, **kwargs):
        """