... __init__ method. If you do so, however, take care not to change the calling signature as any change may prevent the model instance from being saved. Additionally, referring to model fields within __init__ may potentially result in infinite recursion err ... fferent type (for example, a string assigned to a UUIDField ) may be converted when save() executes a query, the in-memory instance will keep the original value until it is reloaded . モデルの読み込みをカスタマイズする ¶ classmethod Model. from_db ( db , ... all of the model's fields are present, then values are guaranteed to be in the order __init__() expects them. That is, the instance can be created by cls(*values) . If any fields are deferred, they won't appear in field_names . In that case, assign a val ... ... __init__ method. If you do so, however, take care not to change the calling signature as any change may prevent the model instance from being saved. Additionally, referring to model fields within __init__ may potentially result in infinite recursion err ... fferent type (for example, a string assigned to a UUIDField ) may be converted when save() executes a query, the in-memory instance will keep the original value until it is reloaded . モデルの読み込みをカスタマイズする ¶ classmethod Model. from_db ( db , ... all of the model's fields are present, then values are guaranteed to be in the order __init__() expects them. That is, the instance can be created by cls(*values) . If any fields are deferred, they won't appear in field_names . In that case, assign a val ... ... # Creating a form to change an existing article. >>> article = Article . objects . get ( pk = 1 ) >>> form = ArticleForm ( instance = article ) フィールドの型 ¶ 生成された Form クラスは、指定された全てのモデルフィールドに対して、 fields 属性で指定された順 ... ドをオーバーライドして、バリデーションの動作を追加できます。 モデルのオブジェクトに付属したモデルフォームのインスタンスは、 instance 属性を持ち、メソッドが特定のモデルのインスタンスにアクセスできるようにします。 警告 The ModelForm.clean() method sets flag ... は、フォームに結びつけられたデータからデータベースオブジェクトを生成して保存します。 ModelForm のサブクラスはキーワード引数 instance として既存のモデルインスタンスを受け取ることができます; これが指定されると、 save() はそのインスタンスを更新するようになり ... ... # Creating a form to change an existing article. >>> article = Article . objects . get ( pk = 1 ) >>> form = ArticleForm ( instance = article ) フィールドの型 ¶ 生成された Form クラスは、指定された全てのモデルフィールドに対して、 fields 属性で指定された順 ... ドをオーバーライドして、バリデーションの動作を追加できます。 モデルのオブジェクトに付属したモデルフォームのインスタンスは、 instance 属性を持ち、メソッドが特定のモデルのインスタンスにアクセスできるようにします。 警告 The ModelForm.clean() method sets flag ... は、フォームに結びつけられたデータからデータベースオブジェクトを生成して保存します。 ModelForm のサブクラスはキーワード引数 instance として既存のモデルインスタンスを受け取ることができます; これが指定されると、 save() はそのインスタンスを更新するようになり ... ... ith a fetch mode , making it more efficient or even blocking it. Use QuerySet.fetch_mode() to set the fetch mode for model instances fetched by a QuerySet : from django.db import models books = Book . objects . fetch_mode ( models . FETCH_PEERS ) Fetch m ... d with QuerySet.defer() or QuerySet.only() ジェネリックリレーション（汎用リレーション） Django copies the fetch mode of an instance to any related objects it fetches, so the mode applies to a whole tree of relationships, not just the top-level model in t ... dels . CASCADE ) ... …and this loop: for book in books : print ( book . author . name ) …where books is a QuerySet of Book instances using some fetch mode. FETCH_ONE ¶ Fetches the missing field for the current instance only. This is the default mode. Usi ... ... render_to_string ( "templates/emails/my_email.html" , context = { "my_variable" : 42 }, ) # Then, create a multipart email instance. msg = EmailMultiAlternatives ( subject = "Subject here" , body = text_content , from_email = "from@example.com" , to = [ ... .com" ], headers = { "List-Unsubscribe" : "<mailto:unsub@example.com>" }, ) # Lastly, attach the HTML content to the email instance and send. msg . attach_alternative ( html_content , "text/html" ) msg . send () Configuring email ¶ New Django projects ar ... se advanced features, such as BCC'ed recipients, file attachments, or multi-part email, you'll need to create EmailMessage instances directly. 注釈 This is a design feature. send_mail() and related functions were originally the only interface Django prov ... ... render_to_string ( "templates/emails/my_email.html" , context = { "my_variable" : 42 }, ) # Then, create a multipart email instance. msg = EmailMultiAlternatives ( subject = "Subject here" , body = text_content , from_email = "from@example.com" , to = [ ... .com" ], headers = { "List-Unsubscribe" : "<mailto:unsub@example.com>" }, ) # Lastly, attach the HTML content to the email instance and send. msg . attach_alternative ( html_content , "text/html" ) msg . send () Configuring email ¶ New Django projects ar ... se advanced features, such as BCC'ed recipients, file attachments, or multi-part email, you'll need to create EmailMessage instances directly. 注釈 This is a design feature. send_mail() and related functions were originally the only interface Django prov ... ... as been cleaned and validated, the UploadedFile object will have an additional image attribute containing the Pillow Image instance used to check if the file was a valid image. It will also update UploadedFile.content_type with the image's content type a ... he database, which can lead to somewhat complex queries involving nested REPLACE function calls. You can now refresh model instances by using Model.refresh_from_db() . You can now get the set of deferred fields for a model using Model.get_deferred_fields ... a Uniform Resource Identifier (URI) properly. HttpResponse now implements a few additional methods like getvalue() so that instances can be used as stream objects. The new HttpResponse.setdefault() method allows setting a header unless it has already bee ... ... as been cleaned and validated, the UploadedFile object will have an additional image attribute containing the Pillow Image instance used to check if the file was a valid image. It will also update UploadedFile.content_type with the image's content type a ... he database, which can lead to somewhat complex queries involving nested REPLACE function calls. You can now refresh model instances by using Model.refresh_from_db() . You can now get the set of deferred fields for a model using Model.get_deferred_fields ... a Uniform Resource Identifier (URI) properly. HttpResponse now implements a few additional methods like getvalue() so that instances can be used as stream objects. The new HttpResponse.setdefault() method allows setting a header unless it has already bee ... ... ith a fetch mode , making it more efficient or even blocking it. Use QuerySet.fetch_mode() to set the fetch mode for model instances fetched by a QuerySet : from django.db import models books = Book . objects . fetch_mode ( models . FETCH_PEERS ) Fetch m ... d with QuerySet.defer() or QuerySet.only() ジェネリックリレーション（汎用リレーション） Django copies the fetch mode of an instance to any related objects it fetches, so the mode applies to a whole tree of relationships, not just the top-level model in t ... dels . CASCADE ) ... …and this loop: for book in books : print ( book . author . name ) …where books is a QuerySet of Book instances using some fetch mode. FETCH_ONE ¶ Fetches the missing field for the current instance only. This is the default mode. Usi ... 2026年10月08日