嵌套资源

Question

我试图将我的消息控制器嵌入到我的通道控制器中。但是，当我去我的邮件查看我的错误 “找不到没有ID通道”

class MessagesController < ApplicationController 

    def index 
    @channel = Channel.find(params[:channel_id]) 
    @messages = @channel.messages 
    end 

    def new 
    @channel = Channel.find(params[:channel_id]) 
    @message = @channel.messages.build 
    end 

    def create 
    @channel = Channel.find(params[:channel_id]) 
    @message = @channel.messages.build(params[:message]) 
    if @message.save 
     flash[:notice] = "Successfully created message." 
     redirect_to channel_url(@message.channel_id) 
    else 
     render :action => 'new' 
    end 
    end 

    def edit 
    @message = Message.find(params[:id]) 
    end 

    def update 
    @message = Message.find(params[:id]) 
    if @message.update_attributes(params[:message]) 
     flash[:notice] = "Successfully updated message." 
     redirect_to channel_url(@message.channel_id) 
    else 
     render :action => 'edit' 
    end 
    end 

    def destroy 
    @message = Message.find(params[:id]) 
    @message.destroy 
    flash[:notice] = "Successfully destroyed message." 
    redirect_to channel_url(@message.channel_id) 
    end 
end 

通道控制器

class ChannelsController < ApplicationController 

    def index 
    @channels = Channel.find(:all) 
    end 

    def show 
    @channel = Channel.find(params[:id]) 
    @message = Message.new(:channel => @channel) 
    end 

    def new 
    @channel = Channel.new 
    end 

    def create 
    @channel = Channel.new(params[:channel]) 
    if @channel.save 
     flash[:notice] = "Successfully created channel." 
     redirect_to @channel 
    else 
     render :action => 'new' 
    end 
    end 

    def edit 
    @channel = Channel.find(params[:id]) 
    end 

    def update 
    @channel = Channel.find(params[:id]) 
    if @channel.update_attributes(params[:channel]) 
     flash[:notice] = "Successfully updated channel." 
     redirect_to @channel 
    else 
     render :action => 'edit' 
    end 
    end 

    def destroy 
    @channel = Channel.find(params[:id]) 
    @channel.destroy 
    flash[:notice] = "Successfully destroyed channel." 
    redirect_to channels_url 
    end 
end 

的routes.rb

SeniorProject::Application.routes.draw do 

    resources :users 
    resources :channels, :shallow => true do |channels| 
    channels.resources :messages 
    end 

    root :channels 

    resources :users, :user_sessions 

    match 'login' => 'user_sessions#new', :as => :login 
    match 'logout' => 'user_sessions#destroy', :as => :logout 
    match ':controller(/:action(/:id(.:format)))' 

末

Answer 1

这里发生了什么事是这条线：

@channel = Channel.find(params[:channel_id]) 

由于params散列中没有定义的channel_id，导致摔倒。我看你用浅浅的路线，这意味着你的URI可能是这样的：

/messages 

而你需要它看起来像：

/channels/1/messages 

试着改变你的网址是：

而不是

channel_messages_url(@channel) 

messages_url 

这是一个猜测顺便说一句，这可能是因为你已经定义了你的routes.rb，这看起来有点奇怪，因为你定义了两次消息路由，一次是has_many，一次是适当的资源。你可能想要这样的东西：

# assuming you need shallow routes 
resources :channels, :shallow => true do |channels| 
    channels.resources :messages 
end