ruby-on-rails-3 – 如何从Rails 3中的模型进行路由和渲染(调度)

# 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

上面的代码有效,但感觉很笨拙.什么是正确的方法呢？我想象Yehuda Katz会告诉我类似的东西：

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：

# 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

另见：Rails 3 request dispatch cycle