向现有控制器添加操作(Ruby on Rails) [英] Adding an action to an existing controller (Ruby on Rails)

问题描述

我是 Ruby on Rails 的新手，我已经完成了博客教程.

I am new to Ruby on Rails, I have completed the Blog Tutorial.

我现在正在尝试向控制器添加一个名为开始"的附加操作.

I am now trying to add an additional action to the controller, called 'start'.

def start
end

我添加了一个视图页面app/views/posts/start.html.erb"，只包含简单的 html.

I have added a view page "app/views/posts/start.html.erb" containing nothing but simple html.

当我转到/posts/start 时，出现以下错误.

When I go to /posts/start i get the following error.

ActiveRecord::RecordNotFound in PostsController#show 
Couldn't find Post with ID=start

我了解错误，正在执行 show 操作并且 start 不是有效 ID.为什么启动操作没有被执行，我是否缺少 MVC 架构或配置的某些部分?

I understand the error, the show action is being executed and start is not a valid ID. Why doesn't the start action get executed, is there some part of the MVC architecture or configuration I am missing ?

下面是我的posts_controller.rb

Below is my posts_controller.rb

class PostsController < ApplicationController

  # GET /posts/start
  def start
  end

  # GET /posts
  # GET /posts.xml
  def index
    @posts = Post.find(:all)
    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @posts }
    end
  end

  # GET /posts/1
  # GET /posts/1.xml
  def show
    @post = Post.find(params[:id])
    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @post }
    end
  end

end

是的，我已经重新启动了服务器并尝试使用 Mongrel 和 webrick.

Yes I have restarted the server and tried it with Mongrel and webrick.

推荐答案

您的路由未设置为允许该路由.假设您使用的是默认脚手架，请将这一行放在 config/routes.rb 中的 map.resources :posts 行之前:

Your routing isn't set up to allow that route. Assuming you're using the default scaffolding, put this line before the map.resources :posts line in config/routes.rb:

map.connect "posts/:action", :controller => 'posts', :action => /[a-z]+/i

:action 的正则表达式将其限制为 a-z(以避免捕获诸如/posts/1 之类的内容).如果您在新操作中需要下划线或数字，则可以对其进行改进.

The regex for :action restricts it to just a-z (to avoid catching things like /posts/1). It can be improved if you need underscores or numbers in your new actions.

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