... values() call. Any extra() call made after a values() call will have its extra selected fields ignored. Calling only() and defer() after values() doesn't make sense, so doing so will raise a TypeError . トランスフォームと集計の処理を組み合わせるには、 ... y this QuerySet . The fetch mode controls on-demand loading of fields when they are accessed, such as for foreign keys and deferred fields. For example, to use the FETCH_PEERS mode to batch-load all related objects on first access: from django.db impo ... 使用したい。 関連オブジェクトのサブセットのみを事前読み込みしたい。 You want to use performance optimization techniques like deferring fields, for example, via defer() or only() : >>> queryset = Pizza . objects . only ( "name" ) >>> >>> restaurants = Re ... ... values() call. Any extra() call made after a values() call will have its extra selected fields ignored. Calling only() and defer() after values() doesn't make sense, so doing so will raise a TypeError . トランスフォームと集計の処理を組み合わせるには、 ... y this QuerySet . The fetch mode controls on-demand loading of fields when they are accessed, such as for foreign keys and deferred fields. For example, to use the FETCH_PEERS mode to batch-load all related objects on first access: from django.db impo ... 使用したい。 関連オブジェクトのサブセットのみを事前読み込みしたい。 You want to use performance optimization techniques like deferring fields, for example, via defer() or only() : >>> queryset = Pizza . objects . only ( "name" ) >>> >>> restaurants = Re ... ... e. バグ修正 ¶ Allowed inherited and m2m fields to be referenced in the admin ( #23329 ). Fixed a crash when using QuerySet.defer() with select_related() ( #23370 ). 目次 Django 1.6.7 リリースノート バグ修正 前のトピックへ Django 1.6.8 リリースノート 次 ... bugs including regression security release バグ 修正 Allowed inherited fields referenced admin Fixed crash using QuerySet defer クイック検索 Last update: 2026年10月09日 « previous | up | next » ... ... , or None if not constrained. Defaults to None . This attribute can be set using using() . The backend must have supports_defer set to True to use this feature. Otherwise, InvalidTask is raised. name [ソース] ¶ The name of the function decorated with ... identify the supported functionality of a backend, and potentially change behavior accordingly. BaseTaskBackend. supports_defer ¶ Whether the backend supports enqueueing Tasks to be executed after a specific time using the run_after attribute. BaseTa ... he below table notes which of the built-in backends support which features: Feature DummyBackend ImmediateBackend supports_defer Yes No supports_async_task Yes Yes supports_get_result No No [ 1 ] supports_priority Yes [ 2 ] Yes [ 3 ] Available backend ... ... , or None if not constrained. Defaults to None . This attribute can be set using using() . The backend must have supports_defer set to True to use this feature. Otherwise, InvalidTask is raised. name [ソース] ¶ The name of the function decorated with ... identify the supported functionality of a backend, and potentially change behavior accordingly. BaseTaskBackend. supports_defer ¶ Whether the backend supports enqueueing Tasks to be executed after a specific time using the run_after attribute. BaseTa ... he below table notes which of the built-in backends support which features: Feature DummyBackend ImmediateBackend supports_defer Yes No supports_async_task Yes Yes supports_get_result No No [ 1 ] supports_priority Yes [ 2 ] Yes [ 3 ] Available backend ... ... late code - as long as the dicts you supply have the same attributes as those used in the template, you are fine. QuerySet.defer() や only() を使用する ¶ Use defer() and only() if there are database columns you know that you won't need (or won't need ... も、データベースは結果の1行のために、非テキスト、非 VARCHAR データのほとんどをディスクから読み込まなければならないからです。 defer() と only() メソッドは、多くのテキストデータの読み込みを避けられる場合や、Python に戻すのに多くの処理が必要なフィールドに対 ... を使用する Use prefetch_related_objects() 必要ないものを取り出さない QuerySet.values() や values_list() を使用する QuerySet.defer() や only() を使用する QuerySet.contains(obj) を使用する QuerySet.count() を使用する QuerySet.exists() を使用する contains ... ... late code - as long as the dicts you supply have the same attributes as those used in the template, you are fine. QuerySet.defer() や only() を使用する ¶ Use defer() and only() if there are database columns you know that you won't need (or won't need ... も、データベースは結果の1行のために、非テキスト、非 VARCHAR データのほとんどをディスクから読み込まなければならないからです。 defer() と only() メソッドは、多くのテキストデータの読み込みを避けられる場合や、Python に戻すのに多くの処理が必要なフィールドに対 ... を使用する Use prefetch_related_objects() 必要ないものを取り出さない QuerySet.values() や values_list() を使用する QuerySet.defer() や only() を使用する QuerySet.contains(obj) を使用する QuerySet.count() を使用する QuerySet.exists() を使用する contains ... ... e. バグ修正 ¶ Allowed inherited and m2m fields to be referenced in the admin ( #23329 ). Fixed a crash when using QuerySet.defer() with select_related() ( #23370 ). 目次 Django 1.6.7 リリースノート バグ修正 前のトピックへ Django 1.6.8 リリースノート 次 ... ... h an invalid INSTALLED_APPS setting ( #25510 ). This regression appeared in 1.8.5 as a side effect of fixing #24704 . Made deferred models use their proxied model's _meta.apps for caching and retrieval ( #25563 ). This prevents any models generated in ... data migrations using QuerySet.defer() from leaking to test and application code. Fixed a typo in the name of the strictly_above PostGIS lookup ( #25592 ). Fix ... ... h an invalid INSTALLED_APPS setting ( #25510 ). This regression appeared in 1.8.5 as a side effect of fixing #24704 . Made deferred models use their proxied model's _meta.apps for caching and retrieval ( #25563 ). This prevents any models generated in ... data migrations using QuerySet.defer() from leaking to test and application code. Fixed a typo in the name of the strictly_above PostGIS lookup ( #25592 ). Fix ... 2026年10月08日