如何触发属于自动删除该对象的连接模型一部分的对象的销毁回调？

发布于 2024-10-15 05:21:01 字数 626 浏览 8 评论 0原文

轨道 2.3.8。我有 3 个模型：用户、源和订阅。

User  attr_accessible   :source_ids
             has_many   :subscriptions
             has_many   :sources, :through => :subscriptions

Source       has_many   :subscriptions

Subscription belongs_to :user
             belongs_to :source

我有一个界面，允许用户编辑他们对源的订阅。它收集source_ids，并根据收集创建或删除订阅。我遇到的问题是，引用：

“直接自动删除连接模型，不会触发销毁回调。”

订阅将被删除，而不是被销毁。我在订阅模型中有一个未触发的回调：

before_destroy do |subscription|
  [Some irrelevant object not to be mentioned].destroy
end

我的问题是，当订阅由于加入模型而自动删除时，如何触发此回调？

原文

Rails 2.3.8. I have 3 models, User, Source, and Subscription.

User  attr_accessible   :source_ids
             has_many   :subscriptions
             has_many   :sources, :through => :subscriptions

Source       has_many   :subscriptions

Subscription belongs_to :user
             belongs_to :source

I have an interface that allows a User to edit their Subscriptions to a Source. It collects source_ids, and creates or deletes a Subscription based on the collection. The problem I am having is, quote:

"Automatic deletion of join models is direct, no destroy callbacks are triggered."

The Subscriptions are being deleted, not destroyed. I have a callback in the Subscription model that is not triggered:

before_destroy do |subscription|
  [Some irrelevant object not to be mentioned].destroy
end

My question is, how can I trigger this callback when a Subscription is automatically deleted due to the join model?

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初见 2024-10-22 05:21:01

回复您在HMT collection_singular_ids=删除连接模型是直接的，不会触发销毁回调中的

回复将此行：更改

 has_many :users, :through => :memberships

为：

 has_many :users, :through => :memberships, :after_remove => :your_custom_method

并且在用户模型中定义受保护的 your_custom_method 。这样，当用户删除某个源的订阅时，就会调用此方法。

祝你好运！

Replying to your reply in HMT collection_singular_ids= deletion of join models is direct, no destroy callbacks are triggered

Change this line:

 has_many :users, :through => :memberships

To this:

 has_many :users, :through => :memberships, :after_remove => :your_custom_method

And define protected your_custom_method in User model. This way when a user removes a Subscription to some Source, this method gets called.

Good luck!

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尝蛊 2024-10-22 05:21:01

@user.subscriptions.delete
has_many   :subscriptions, :dependent => :destroy    # <- setting this on the association  will destroy the related subscriptions
has_many   :subscriptions, :dependent => :delete_all # <- setting this on the association  will delete the related subscriptions

来自 rdoc：

collection.delete(object, …)
通过将外键设置为 NULL 来从集合中删除一个或多个对象。如果对象与 :dependent => 关联，则它们也会被销毁。 :destroy，如果与 :dependent => 关联则删除：删除全部

@user.subscriptions.delete
has_many   :subscriptions, :dependent => :destroy    # <- setting this on the association  will destroy the related subscriptions
has_many   :subscriptions, :dependent => :delete_all # <- setting this on the association  will delete the related subscriptions

From the rdoc:

collection.delete(object, …)
Removes one or more objects from the collection by setting their foreign keys to NULL. Objects will be in addition destroyed if they’re associated with :dependent => :destroy, and deleted if they’re associated with :dependent => :delete_all

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