... 使用例: >>> from django.db.models import FloatField >>> from django.db.models.functions import Cast >>> Author . objects . create ( age = 25 , name = "Margaret Smith" ) >>> author = Author . objects . annotate ( ... age_as_float = Cast ( "age" , output ... ost public >>> from django.db.models import Sum >>> from django.db.models.functions import Coalesce >>> Author . objects . create ( name = "Margaret Smith" , goes_by = "Maggie" ) >>> author = Author . objects . annotate ( screen_name = Coalesce ( "alia ... ey ( Blog , on_delete = models . CASCADE ) >>> from django.db.models.functions import Greatest >>> blog = Blog . objects . create ( body = "Greatest is the best." ) >>> comment = Comment . objects . create ( body = "No, Least is better." , blog = blog ... ... 使用例: >>> from django.db.models import FloatField >>> from django.db.models.functions import Cast >>> Author . objects . create ( age = 25 , name = "Margaret Smith" ) >>> author = Author . objects . annotate ( ... age_as_float = Cast ( "age" , output ... ost public >>> from django.db.models import Sum >>> from django.db.models.functions import Coalesce >>> Author . objects . create ( name = "Margaret Smith" , goes_by = "Maggie" ) >>> author = Author . objects . annotate ( screen_name = Coalesce ( "alia ... ey ( Blog , on_delete = models . CASCADE ) >>> from django.db.models.functions import Greatest >>> blog = Blog . objects . create ( body = "Greatest is the best." ) >>> comment = Comment . objects . create ( body = "No, Least is better." , blog = blog ... ... ジェクトは、渡された値がデータの部分集合であるものです。これは SQL 演算子 @> を使用します。たとえば、: >>> Post . objects . create ( name = "First post" , tags = [ "thoughts" , "django" ]) >>> Post . objects . create ( name = "Second post" , tags = [ "t ... houghts" ]) >>> Post . objects . create ( name = "Third post" , tags = [ "tutorial" , "django" ]) >>> Post . objects . filter ( tags__contains = [ "thoughts" ]) < ... ジェクトは、データが渡された値の部分集合であるものです。これにはSQL演算子 <@ が使用されます。たとえば: >>> Post . objects . create ( name = "First post" , tags = [ "thoughts" , "django" ]) >>> Post . objects . create ( name = "Second post" , tags = [ "t ... ... ジェクトは、渡された値がデータの部分集合であるものです。これは SQL 演算子 @> を使用します。たとえば、: >>> Post . objects . create ( name = "First post" , tags = [ "thoughts" , "django" ]) >>> Post . objects . create ( name = "Second post" , tags = [ "t ... houghts" ]) >>> Post . objects . create ( name = "Third post" , tags = [ "tutorial" , "django" ]) >>> Post . objects . filter ( tags__contains = [ "thoughts" ]) < ... ジェクトは、データが渡された値の部分集合であるものです。これにはSQL演算子 <@ が使用されます。たとえば: >>> Post . objects . create ( name = "First post" , tags = [ "thoughts" , "django" ]) >>> Post . objects . create ( name = "Second post" , tags = [ "t ... ... ions directly, but expression construction and usage often does not happen in the same place (for example, QuerySet method creates expressions, for later use in views). alias() allows building complex expressions incrementally (possibly spanning multip ... ode() ¶ New in Django 6.1. fetch_mode ( mode ) ¶ Returns a QuerySet that sets the given fetch mode for all model instances created by this QuerySet . The fetch mode controls on-demand loading of fields when they are accessed, such as for foreign keys a ... ーマンスが低下します。ですから、この機能は注意深く利用してください! Also, if you call the database-altering methods add() , create() , remove() , clear() or set() , on a RelatedManager , any prefetched cache for the relation will be cleared. 通常の結合構 ... ... ions directly, but expression construction and usage often does not happen in the same place (for example, QuerySet method creates expressions, for later use in views). alias() allows building complex expressions incrementally (possibly spanning multip ... ode() ¶ New in Django 6.1. fetch_mode ( mode ) ¶ Returns a QuerySet that sets the given fetch mode for all model instances created by this QuerySet . The fetch mode controls on-demand loading of fields when they are accessed, such as for foreign keys a ... ーマンスが低下します。ですから、この機能は注意深く利用してください! Also, if you call the database-altering methods add() , create() , remove() , clear() or set() , on a RelatedManager , any prefetched cache for the relation will be cleared. 通常の結合構 ... ... 参考 save() はここには記述されていない多数の高度なオプションを持ちます。詳細については save() の項目を参照してください。 To create and save an object in a single step, use the create() method. オブジェクトに対する変更を保存する ¶ 既にデータベース上に存在 ... or インスタンス joe を entry オブジェクトに追加しています: >>> from blog.models import Author >>> joe = Author . objects . create ( name = "Joe" ) >>> entry . authors . add ( joe ) 複数のレコードを ManyToManyField に一気に追加するには、 add() の呼び出し ... に複数の引数を含めてください: >>> john = Author . objects . create ( name = "John" ) >>> paul = Author . objects . create ( name = "Paul" ) >>> george = Author . objects . create ( name = " ... ... 参考 save() はここには記述されていない多数の高度なオプションを持ちます。詳細については save() の項目を参照してください。 To create and save an object in a single step, use the create() method. オブジェクトに対する変更を保存する ¶ 既にデータベース上に存在 ... or インスタンス joe を entry オブジェクトに追加しています: >>> from blog.models import Author >>> joe = Author . objects . create ( name = "Joe" ) >>> entry . authors . add ( joe ) 複数のレコードを ManyToManyField に一気に追加するには、 add() の呼び出し ... に複数の引数を含めてください: >>> john = Author . objects . create ( name = "John" ) >>> paul = Author . objects . create ( name = "Paul" ) >>> george = Author . objects . create ( name = " ... ... e notes, looking for organization and writing errors. Draft a blog post and email announcement. Update version numbers and create the release artifacts. Create the new Release in the admin on djangoproject.com . Set the proper date but ensure the flag ... release if necessary. Ensure your PyPI account only uses WebAuthn-based authentication factors, not TOTP (one-time codes). Create an API token following the official documentation , and set up your $HOME/.pypirc file like this: ~/.pypirc ¶ [distutils] ... st.api.transifex.com token = # API token Access to the Django admin on djangoproject.com as a "Site maintainer". Access to create a post in the Django Forum - Announcements category and to send emails to the django-announce mailing list. Access to the ... ... e notes, looking for organization and writing errors. Draft a blog post and email announcement. Update version numbers and create the release artifacts. Create the new Release in the admin on djangoproject.com . Set the proper date but ensure the flag ... release if necessary. Ensure your PyPI account only uses WebAuthn-based authentication factors, not TOTP (one-time codes). Create an API token following the official documentation , and set up your $HOME/.pypirc file like this: ~/.pypirc ¶ [distutils] ... st.api.transifex.com token = # API token Access to the Django admin on djangoproject.com as a "Site maintainer". Access to create a post in the Django Forum - Announcements category and to send emails to the django-announce mailing list. Access to the ... 2026年10月08日