我对 Rails 开发比较陌生,并且遇到了一个小的关联问题。我想将一个关联命名为与其所链接的模型不同的名称。
我有以下2个型号:
class User < ActiveRecord::Base
has_many :events
end
class Event < ActiveRecord::Base
belongs_to :admin, :class_name => "User" # So we can call event.admin to retrieve the User who owns this Event
end
我建立一个用户如下:
event = event.create! :title => "New Event"
user = User.create! :username => "thinkswan"
user.events << event
user.save
当我跳入控制台时,我收到以下信息:
irb> user = User.find(1)
irb> user.events
=> [#<Event id: 1, title: "New Event", user_id: 1, created_at: "2011-06-09 06:41:09", updated_at: "2011-06-09 06:41:10">]
irb> event = Event.find(1)
irb> event.user_id
=> 1
irb> event.admin
=> nil
谁能解释一下为什么admin
关联没有返回它指向的用户?谢谢!
您需要指定两者:class_name
and :foreign_key
, 例如:
belongs_to :admin, :class_name => "User", :foreign_key => "user_id"
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