我可以通過關係中的外鍵做一個`has_many'嗎？

Question

我有三個型號 - User, Membership, Connection，它們看起來就像這樣：

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...我希望做的是從安裝到user一個connections直接連接。所以，理想情況下我希望能夠做到user.invited_connections或user.inviter_connections，他們將對應正確的連接。

即user.invited_connections將對應於連接在membership.user_id == current_user.id（但請記住它與已與... user_id與user_id相關的不只是成員相關聯的成員記錄相關聯的連接。

這是可能的

Answer 1

你可以嘗試這樣的：？！

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

乾杯