forms.py 文件源码

def label_from_instance(self, obj):
        """
        Return option label representation from instance.

        Can be overridden to change the representation of each choice.

        Example usage::

            class MyWidget(ModelSelect2Widget):
                def label_from_instance(obj):
                    return force_text(obj.title).upper()

        Args:
            obj (django.db.models.Model): Instance of Django Model.

        Returns:
            str: Option label.

        """
        return force_text(obj)