ruby-on-rails – 了解Rails 3的respond_with

我问,因为我试图得到一个脚手架生成规格(包括在下面)通过,如果只是这样我可以理解它.该应用程序正常工作,但奇怪的是,当验证失败时,它似乎是渲染/操作符(至少这是浏览器的URL所示).然而,这个规范正在期待着“新”(我也是这样),而是正在接收“&”.如果我更改规格期望“”它仍然失败.

当它呈现/载体时,该页面会显示出验证失败的字段旁边的error_messages.

熟悉response_with的任何人都可以看到这里发生了什么？

#carrier.rb
  validates :name,:presence => true 

#carriers_controller.rb
class CarriersController < ApplicationController
  respond_to :html,:json

...

  def new
    respond_with(@carrier = Carrier.new)
  end

  def create
     @carrier = Carrier.new(params[:carrier])
     flash[:success] = 'Carrier was successfully created.' if @carrier.save
     respond_with(@carrier) 
  end

规格是失败的：

#carriers_controller_spec.rb
require 'spec_helper'

describe CarriersController do

  def mock_carrier(stubs={})
    (@mock_carrier ||= mock_model(Carrier).as_null_object).tap do |carrier|
      carrier.stub(stubs) unless stubs.empty?
    end
  end


  describe "POST create" do
    describe "with invalid params" do
      it "re-renders the 'new' template" do
        Carrier.stub(:new) { mock_carrier(:save => false) }
        post :create,:carrier => {}
        response.should render_template("new")
      end
    end
  end
end

有这个错误：

1) CarriersController POST create with invalid params re-renders the 'new' template
     Failure/Error: response.should render_template("new")
     expecting <"new"> but rendering with <"">.
     Expected block to return true value.
     # (eval):2:in `assert_block'
     # ./spec/controllers/carriers_controller_spec.rb:81:in `block (4 levels) in <top (required)>'