autodetector.py 文件源码

def swappable_first_key(self, item):
        """
        Sorting key function that places potential swappable models first in
        lists of created models (only real way to solve #22783)
        """
        try:
            model = self.new_apps.get_model(item[0], item[1])
            base_names = [base.__name__ for base in model.__bases__]
            string_version = "%s.%s" % (item[0], item[1])
            if (
                model._meta.swappable or
                "AbstractUser" in base_names or
                "AbstractBaseUser" in base_names or
                settings.AUTH_USER_MODEL.lower() == string_version.lower()
            ):
                return ("___" + item[0], "___" + item[1])
        except LookupError:
            pass
        return item