ruby-on-rails - 如何通过一个查询访问两个多态关联？

Question

在我的 Rails 6 应用程序中，我有这些模型：

class Account < ApplicationRecord

  has_many :carriers
  has_many :clients

  # Unfortunately, these two don't work together. I have to uncomment one of them to get the other one to work:
  has_many :people, :through => :carriers # works but omits clients
  has_many :people, :through => :clients # works but omits carriers

end

---

class Carrier < ApplicationRecord

  belongs_to :account

  has_many :people, :as => :personalizable

end

---

class Client < ApplicationRecord
  
  belongs_to :account

  has_many :people, :as => :personalizable

end

---

class Person < ApplicationRecord

  belongs_to :personalizable, :polymorphic => true

end

---

如何在一个查询中carriers 访问帐户？ clients

我很想做一些事情，比如account.people向所有帐户的人展示，但还没有找到实现这一目标的方法。

怎么做到呢？

标签： ruby-on-railsrubyactiverecord

Answer 1

您不能对两个关联使用相同的方法名称，而是可以将其重命名为carrier_peopleandclient_people并热切加载两者。

class Account < ApplicationRecord

  has_many :carriers
  has_many :clients

  has_many :carrier_people, :through => :carriers, source: :people # works but omits clients
  has_many :client_people, :through => :clients, source: :people # works but omits carriers

end

你可以像这样急切地加载。

Account.includes(:carrier_people, :client_people)