我可以在直通关系中对外键执行“has_many through”吗？

Question

我有三个模型 - User, Membership, Connection，它们看起来像这样：

class User < ActiveRecord::Base
  has_many :memberships, dependent: :destroy
end

class Membership < ActiveRecord::Base
  belongs_to :inviter, class_name: "User", foreign_key: "user_id"
  belongs_to :invited, class_name: "User", foreign_key: "invited_id"
  has_many :connections, dependent: :destroy
end

class Connection < ActiveRecord::Base
  belongs_to :inviter_membership, class_name: "Membership", foreign_key: "membership_id"
  belongs_to :invited_membership, class_name: "Membership", foreign_key: "invited_membership_id"
end

但是...我想做的是建立从user 到connections 的直接连接。所以，理想情况下，我希望能够做到user.invited_connections 或user.inviter_connections，它们将对应正确的连接。

即user.invited_connections 将对应于 membership.user_id == current_user.id 所在的连接（但请记住，与 user_id 相关联的成员记录相关联的连接......不仅仅是与 user_id 相关联的成员资格。

这可能吗？

Answer 1

您可以尝试以下方法：

has_many :invited_connections, through: :memberships, source: :invited_membership
has_many :inviter_connections, through: :memberships, source: :inviter_membership

干杯！