处理中Rails3控制器404与DataMapper的获得最佳方式 [英] Best way to handle 404 in Rails3 controllers with a DataMapper get

问题描述

这很简单，我想处理正常的[显示]请求，调用DataMapper的就像我在Merb的做到了。

It's very simple, I want to handle a normal [show] request with a call to DataMapper like I did in Merb.

使用ActiveRecord的，我可以这样做：

With ActiveRecord I could have done this:

class PostsController
  def show
    @post = Post.get(params[:id])
    @comments = @post.comments unless @post.nil?
  end
end

和它通过捕获资源的例外处理404。

and it handles the 404 by catching the resource's exceptions.

DataMapper的，而不是不这样做自动所以现在我用这个解决方案解决它： [感动的答案]

DataMapper instead doesn't do this automatically so right now I'm solving it with this solution: [moved in the answers]

有可能告诉控制器停止NOT_FOUND函数里​​面？

It is possible to tell the controller to halt inside the not_found function?

推荐答案

我喜欢用异常抛出，然后用的ActionController的 rescue_from 。

I like to use exception throwing, and then use ActionController's rescue_from.

例如：

class ApplicationController < ActionController::Base
  rescue_from DataMapper::ObjectNotFoundError, :with => :not_found

  def not_found
    render file => "public/404.html", status => 404, layout => false
  end
end

class PostsController
  def show
    @post = Post.get!(params[:id]) # This will throw an DataMapper::ObjectNotFoundError if it can't be found
    @comments = @post.comments
  end
end

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