在軌道上使用紅寶石中的相同2表的多個一對多關係？

Question

我有一個數據庫2表;用戶和修訂。修訂版與用戶表有多個一對多關係，例如created_by，verified_by，published_by（每個字段都是外鍵用戶標識）。

我將如何去定義這種關係在我的Rails模型？

Answer 1

class Revision < ActiveRecord::Base 
    belongs_to :creator, :foreign_key => "created_by", :class_name => "User" 
    belongs_to :verifier, :foreign_key => "verified_by", :class_name => "User" 
    belongs_to :publisher, :foreign_key => "published_by", :class_name => "User" 
end 

class User < ActiveRecord::Base 
    has_many :creations, :foreign_key => "created_by", :class_name => "Revision" 
    has_many :verifications, :foreign_key => "verified_by", 
    :class_name => "Revision" 
    has_many :publications, :foreign_key => "published_by", 
    :class_name => "Revision" 
end 

利用這些模型：

User.first.creations #=> [#<Revision>, #<Revision>, ...] 
Revision.first.creator #=> #<User> 
# ...etc., for verifier/verifications and publisher/publications. 

你或許應該更改關聯名稱到任何最有意義的您的應用程序。