创建关系保存相关的ID

Question

我有以下代码：

class User < ActiveRecord::Base 
    has_many :campaigns 
    ... 
end 

class Campaign < ActiveRecord::Base 
    belongs_to :user 
    ... 
end 

class CampaignsController < ApplicationController 

    def create 
    @campaign = Campaign.new(campaign_params) 
    @campaign.user_id = @current_user.id 
    ... 
    end 
end 

的问题是，有没有通过导轨为此提供了一种方法：@campaign.user_id=@current_user.id？

Answer 1

一般来说，我会用

@campaign = current_user.campaigns.build campaign_params 

这将活动与当前用户相关联。