如何知道模型何时被轨道中的 :d ependent => :d estroy 自动解散？

Question

我有以下关联：

class Parent < ActiveRecord::Base
  has_many :children, :dependent => :destroy
  before_destroy :do_some_stuff
end
class Child < ActiveRecord::Base
  belongs_to :parent
  before_destroy :do_other_stuff
end

我想知道do_other_stuff中的销毁是否由dependent=>destroy触发，因为部分销毁将在do_some_stuff 中完成

我尝试了parent.destroyed?、parent.marked_for_destruction?、parent.frozen?，但都不起作用：/

有什么想法吗？

Answer 1

您可以使用关联回调（before_remove或after_remove）

class Parent < ActiveRecord::Base
  has_many :children, :dependent => :destroy, :before_remove => :do_foo
  before_destroy :do_bar
  def do_bar
  end
  def do_foo
  end
end

Answer 2

也许是这样的：

class Parent < ActiveRecord::Base
    has_many :children
    before_destroy :some_stuff
    def some_stuff
        children.each do |child|
            child.parent_say_bye
        end
    end
end
class Child < ActiveRecord::Base
    belongs_to :parent
    before_destroy :do_other_stuff
    def parent_say_bye
        #do some stuff
        delete
    end
end