Method _prefer_eager_defaults

lib/sqlalchemy/orm/mapper.py:874–884

(self, dialect, table)

        self.dispatch.after_mapper_constructed(self, self.class_)

    def _prefer_eager_defaults(self, dialect, table):
        if self.eager_defaults == "auto":
            if not table.implicit_returning:
                return False

            return (
                table in self._server_default_col_keys
                and dialect.insert_executemany_returning
            )
        else:
            return self.eager_defaults

    def _gen_cache_key(self, anon_map, bindparams):
        return (self,)