ruby-on-rails - 使用和测试 Rails ActionController 的 respond_with

Question

提前为这个问题的冗长道歉。如果您耐心等待我，我想您会发现它实际上非常简单……鉴于我有限的 Rails 领域知识，我很难解释清楚。

鉴于 an ActionController commit dated Aug 6 中的这条评论:

 === Builtin HTTP verb semantics

 Rails default renderer holds semantics for each HTTP verb. Depending on the
 content type, verb and the resource status, it will behave differently.

 Using Rails default renderer, a POST request for creating an object could
 be written as:

   def create   
     @user = User.new(params[:user])    
     flash[:notice] = 'User was successfully created.' if @user.save
     respond_with(@user)
       end

 Which is exactly the same as:

   def create
     @user = User.new(params[:user])

     respond_to do |format|
       if @user.save
         flash[:notice] = 'User was successfully created.'
         format.html { redirect_to(@user) }
         format.xml { render :xml => @user, :status => :created, :location => @user }
       else
         format.html { render :action => "new" }
         format.xml { render :xml => @user.errors, :status => :unprocessable_entity }
       end
     end
   end

 The same happens for PUT and DELETE requests.

我修改了一个非常基本的 Controller 以使用respond_with。当 Rails 自动生成的测试尝试将空的 params 传递给更新和创建方法时，除了 2 个规范失败外，一切似乎都运行良好。我可以用一个简单的 if save/else 来纠正这种行为，但我试图理解这个"new"功能。我认为默认规范可能是以过时的方式编写的。

来自提交评论:“由于请求是 POST，respond_with 将检查 @people 资源是否有错误。如果有错误，它将呈现具有不可处理实体状态 (422) 的错误对象。 ”

因此向下滚动到 POST(下方)下的最后一个测试/规范，我是否可以重写它以测试“不可处理的实体状态 (422)”并通过，因此一切都很好？

我的 Controller :

class ClownsController < ApplicationController
  respond_to :html, :json

  def index
    respond_with(@clowns = Clown.all)
  end

  def show
    respond_with(@clown = Clown.find(params[:id]))
  end

  def new
    respond_with(@clown = Clown.new)
  end

  def edit
    respond_with(@clown = Clown.find(params[:id]))
  end

  def create
     @clown = Clown.new(params[:clown])
     flash[:notice] = 'Clown was successfully created.' if @clown.save
     respond_with(@clown) 
  end

  # Replacing def create above with this won't Fail the spec ##
  #
  # def create
  #    @clown = Clown.new(params[:clown])
  #    respond_with(@clown) do |format|
  #      if @clown.save
  #        flash[:notice] = 'Clown was successfully created.'
  #        format.html { redirect_to @clown }
  #      else
  #        format.html { render :action => :new }
  #      end
  #    end
  # end


  def update
    @clown = Clown.find(params[:id])
    flash[:notice] = 'Clown has been updated.' if @clown.update_attributes(params[:clown])
    respond_with(@clown)
  end

  def destroy
    @clown = Clown.find(params[:id])
    flash[:notice] = 'Successfully deleted clown.' if @clown.destroy
    respond_with(@clown)
  end
end

测试规范:

$ rspec spec/
.......F....F..............

Failures:

  1) ClownsController 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/clowns_controller_spec.rb:69:in `block (4 levels) in <top (required)>'

  2) ClownsController PUT update with invalid params re-renders the 'edit' template
     Failure/Error: response.should render_template("edit")
     expecting <"edit"> but rendering with <"">.
     Expected block to return true value.
     # (eval):2:in `assert_block'
     # ./spec/controllers/clowns_controller_spec.rb:107:in `block (4 levels) in <top (required)>'

这是 clowns_controller_spec.rb 的一部分:

require 'spec_helper'

describe ClownsController do

  def mock_clown(stubs={})
    (@mock_clown ||= mock_model(Clown).as_null_object).tap do |clown|
      clown.stub(stubs) unless stubs.empty?
    end
  end

...

  describe "POST create" do

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

Answer 1

尝试用以下代码模拟你的 Clown 类

Clown.stub(:new) { mock_clown(:errors => {:any => 'error'}) }

这样 respond_with 方法就会知道模型保存失败并渲染新模板。