loader.py 文件源码

def migrations_module(cls, app_label):
        if app_label in settings.MIGRATION_MODULES:
            return settings.MIGRATION_MODULES[app_label]
        else:
            app_package_name = apps.get_app_config(app_label).name
            return '%s.%s' % (app_package_name, MIGRATIONS_MODULE_NAME)