ruby-on-rails - Rails 委托(delegate)更新调用

Question

我有两个模型:User (电子邮件:字符串)Profile (名称:字符串)

class User < ActiveRecord::Base
   has_one :profile   
   delegate :name, :name=, :to => :profile   
end

class Profile < ActiveRecord::Base
  belongs_to :user
end

rails c

u = User.new 
u.build_profile         #=> init Profile
u.name = 'foo'
u.email = 'some@ema.il'
u.save                  #=> both User and Profile are saved

u.name = 'bar'
u.save                  #=> true, but changes in Profile were not saved!

u.email = 'new@ema.il'
u.save                  #=> true, new User email was saved, Profile - still not!

u.name                  #=> 'bar', but in database it's 'foo' 

为什么个人资料没有更新(仅第一次保存)？如何解决这个问题？

Answer 1

ArcaneRain，您应该在您的关系中添加“自动保存”选项，而不是为此添加回调:
has_one :profile, :autosave => true
您还应该调查“依赖”选项。
更多信息在这里:
http://guides.rubyonrails.org/association_basics.html#has_one-association-reference