通过构建的has_many [英] has_many through build

问题描述

我有两个型号。用户和帐户如下：

I have two models. User and Account as follows

class Account < ActiveRecord::Base
  has_many :manages
  has_many :users, :through => :manages
end

class User < ActiveRecord::Base
  has_many :manages
  has_many :accounts, :through => :manages
end

如果我是用钢轨控制台和

If I were to use the rails console and create an instance of account by

acc = usr.accounts.build
acc.save

下面的命令将返回创建的帐户实例

The following command would return the account instance created

usr.accounts

但下面的命令不会返回用户实例

But the following command would not return the user instance

acc.users

此外，当我看着桌子加入，也没有创建条目。什么是缺少在这里？我想用它自动创建连接模型条目构建方法。

Also when I look at the Join table, there is no entry created. What am missing here? I thought by using the build method that it automatically creates the join model entry.

推荐答案

尝试节省了用户的对象，而不是

Try saving the user object instead.

acc = usr.accounts.build
usr.save

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