rails：dependent =>：銷燬被忽略

Question

我的關聯選項似乎並未兌現。

class ClassRoom < ActiveRecord::Base 
    has_many :class_assignments, :dependent => :destroy 
    has_many :people, :through=>:class_assignments 

class Person < ActiveRecord::Base 
    has_many :class_assignments, :dependent => :destroy 
    has_many :class_rooms, :through=>:class_assignments 

class ClassAssignment < ActiveRecord::Base 
    belongs_to :person 
    belongs_to :class_room 

也就是說，當一個人或一個教室被刪除時，連接表/模型中的記錄也應該被刪除。

但是，ClassRoom.last.destroy破壞了ClassRoom，但沒有任何關聯ClassAssignments。

我知道:dependent=>:destroy在使用:through時被忽略，但我應該可以在連接模型上使用它嗎？

Answer 1

嘗試

class ClassRoom < ActiveRecord::Base 
    def before_destroy 
    self.class_assignments.destroy_all 
    end 

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