如何保存的has_many数据：通过 [英] How to save data with has_many :through

问题描述

我有很多对许多喜欢下面的游戏和帐户模型之间的关系：

 类帐户＆LT;的ActiveRecord :: Base的
  的has_many：account_games，：依赖=＆GT; ：破坏
  的has_many：游戏：通过=＆GT; ：account_games
结束

一流的游戏和LT;的ActiveRecord :: Base的
  的has_many：account_games，：依赖=＆GT; ：破坏
  的has_many：帐户，：通过=＆GT; ：account_games
结束

类AccountGame＆LT;的ActiveRecord :: Base的
  belongs_to的：帐户
  belongs_to的：游戏
结束
 

现在我知道，让我们说，我想创建一个记录是这样的：

  @account = Account.new（PARAMS [：用户]）
@ account.games＆LT;＆LT; Game.first
@ account.save
 

但我怎么更新一些AccountGame属性，而我这样做？让说 AccountGame 有一些外地名为分数，我将如何更新该属性？你能告诉我做到这一点的最好方法是什么？添加任何字段中通过表，而我保存对象。

解决方案

  @account = Account.new（PARAMS [：用户]）
@accountgame = @ account.account_games.build（：游戏=＆GT; Game.first，：得分=→100）
@ accountgame.save
 

虽然我强烈建议，如果你开始添加列到你的加入模型，你把它叫做不同的东西，例如订阅或会员或类似的东西。一旦你添加列，它不再是一个联接模型，并开始只是作为一个普通的模型。

I have many-to-many relationship between Game and Account models like below:

class Account < ActiveRecord::Base
  has_many :account_games, :dependent => :destroy
  has_many :games, :through => :account_games
end

class Game < ActiveRecord::Base
  has_many :account_games, :dependent => :destroy
  has_many :accounts, :through => :account_games
end

class AccountGame < ActiveRecord::Base
  belongs_to :account
  belongs_to :game
end

Now I know let's say I want to create a record something like:

@account = Account.new(params[:user])
@account.games << Game.first
@account.save

But how am I supposed to update some of the attributes in AccountGame while I'm doing that? Lets say that AccountGame has some field called score, how would I update this attribute? Can you tell me about the best way to do that? To add any field in the through table while I'm saving the object.

解决方案

@account = Account.new(params[:user])
@accountgame = @account.account_games.build(:game => Game.first, :score => 100)
@accountgame.save

Though I'd strongly recommend that if you start adding columns to your join-model that you call it something different eg "subscription" or "membership" or something similar. Once you add columns it stops being a join model and starts just being a regular model.

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