utils.py 文件源码

def _get_content_file(self, app_label, model_name, field_name, fname):
        try:
            saved_files = self.saves_by_field[(app_label, model_name, field_name)]
        except KeyError:
            raise StatsTestStorageError(
                "{}.{}.{} has not been written to yet so there is nothing to read.".format(
                    app_label, model_name, field_name))

        if fname not in saved_files:
            raise StatsTestStorageError(
                "{}.{}.{} has not had a file named '{}' written to it. "
                "Be careful - the storage engine may have added some random "
                "characters to the name before attempting to write.".format(
                    app_label, model_name, field_name, fname))

        field = apps.get_model(app_label, model_name)._meta.get_field(field_name)
        return field.storage.open_no_log(fname)