如何从Ruby on Rails 3中的模型进行布线和渲染（调度） [英] How to route and render (dispatch) from a model in Ruby on Rails 3

问题描述

我想从模型中调度（路由和渲染）。 （我只关心 GET 请求，而忽略了 Accept：标头，所以我只看 PATH_INFO 。）

I want to dispatch (route and render) from a model. (I only care about GET requests and I ignore Accept: headers, so I only look at PATH_INFO.)

# app/models/response.rb
class Response < ActiveRecord::Base
  # col :path_info
  # col :app_version
  # col :body, :type => :text

  def set_body
    params = Rails.application.routes.recognize_path(path_info, :method => :get)
    controller = "#{params[:controller].camelcase}Controller".constantize.new
    controller.action_name = params[:action]
    controller.request = ActionDispatch::Request.new('rack.input' => [])
    controller.request.path_parameters = params.with_indifferent_access
    controller.request.format = params[:format] || 'html'
    controller.response = ActionDispatch::Response.new
    controller.send params[:action]
    self.body = controller.response.body
  end
end

上面的代码可行，但感觉笨拙。什么是正确的方法？我在想 Yehuda Katz 会告诉我这样的东西：

The above code works, but it feels clunky. What's the right way to do it? I'm imagining Yehuda Katz would tell me something like:

def set_body
  # [...]
  app = "#{params[:controller].camelcase}Controller".constantize.action(params[:action])
  app.process params
  self.body = app.response.body
end

FWIW这是我的路线文件：

FWIW here's my routes file:

# config/routes.rb
MyApp::Application.routes.draw do
  resources :products                                       # GET /products.json?merchant_id=foobar
  match '/:id(.:format)' => 'contents#show', :via => 'get'  # GET /examples
  root :to => 'contents#index', :via => 'get'               # GET /
end

另请参阅： 第3条请求分配周期

See also: Rails 3 request dispatch cycle

推荐答案

实际上比这还容易：

session = ActionDispatch::Integration::Session.new(Rails.application)
session.get(path_info)
self.body = session.response.body

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