創建關係保存相關的ID

Question

我有以下代碼：

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 

的問題是，有沒有通過導軌爲此提供了一種方法：@campaign.user_id=@current_user.id？

Answer 1

一般來說，我會用

@campaign = current_user.campaigns.build campaign_params 

這將活動與當前用戶相關聯。