Validation 销毁或销毁所有相关文件前进行检查？轨道4

我目前有一个供应商模型，它可以作为我的用户的路由器。此供应商模型链接到供应商拥有的位置以及活动

一旦用户被创建，它将被赋予一个供应商关联，该关联基本上解除了与该供应商相关的位置和活动的锁定

现在，我的问题是，当一个供应商被“摧毁”时，有没有一种方法可以摧毁与之相关的所有地点、活动和用户？如果没有，是否有一种方法可以运行验证，如果供应商被销毁，则检查数据库中的关联，如果发现记录，则不允许销毁操作

我问这个问题的原因是，如果我销毁了供应商，用户就没有位置，活动也没有关联的供应商，这基本上会使我的应用程序崩溃

用户模型

belongs_to :vendor #user can only have one vendor
has_many :locations, :through => :vendor
has_many :clients, :through => :vendor
has_many :campaigns, :through => :vendor  

belongs_to :vendor
has_many :campaigns

belongs_to :location
belongs_to :user
belongs_to :vendor
has_one :client

has_many :locations #vendor can own many locations 
has_many :clients #vendor can have many clients. Allows multiple employees to see client list
has_many :campaigns #vendor can have many campaigns. Allows multiple employees to see campaigns

位置模型

belongs_to :vendor #user can only have one vendor
has_many :locations, :through => :vendor
has_many :clients, :through => :vendor
has_many :campaigns, :through => :vendor  

belongs_to :vendor
has_many :campaigns

belongs_to :location
belongs_to :user
belongs_to :vendor
has_one :client

has_many :locations #vendor can own many locations 
has_many :clients #vendor can have many clients. Allows multiple employees to see client list
has_many :campaigns #vendor can have many campaigns. Allows multiple employees to see campaigns

活动模式

belongs_to :vendor #user can only have one vendor
has_many :locations, :through => :vendor
has_many :clients, :through => :vendor
has_many :campaigns, :through => :vendor  

belongs_to :vendor
has_many :campaigns

belongs_to :location
belongs_to :user
belongs_to :vendor
has_one :client

has_many :locations #vendor can own many locations 
has_many :clients #vendor can have many clients. Allows multiple employees to see client list
has_many :campaigns #vendor can have many campaigns. Allows multiple employees to see campaigns

供应商型号

belongs_to :vendor #user can only have one vendor
has_many :locations, :through => :vendor
has_many :clients, :through => :vendor
has_many :campaigns, :through => :vendor  

belongs_to :vendor
has_many :campaigns

belongs_to :location
belongs_to :user
belongs_to :vendor
has_one :client

has_many :locations #vendor can own many locations 
has_many :clients #vendor can have many clients. Allows multiple employees to see client list
has_many :campaigns #vendor can have many campaigns. Allows multiple employees to see campaigns

---

简而言之，您可以通过在您的关联上使用

dependent

选项来执行类似操作。可以使用以下任一方法：

：destroy-销毁调用其destroy方法的每个关联对象

：delete_all-删除所有关联对象，而不调用其销毁方法

更新

考虑到您的模型，您应该执行以下操作：

class Vendor < ActiveRecord::Base 

  has_many :locations, dependent: :destroy
  has_many :clients, dependent: :destroy 
  has_many :campaigns, dependent: :destroy
end 

类供应商

---

如上所述，使用销毁选项将销毁与该供应商关联的所有对象。

如果您可以为此发布您的模型，那就太好了。添加了模型详细信息以获得更多澄清！又好又简单。谢谢