用于nil的RSpec未定义方法`update_attributes'：NilClass错误

Question

我正在尝试测试我的Rails应用。现在我正在测试我的微控制器，但我遇到了问题。 我使用设备进行身份验证。 我测试的控制器就像，

class WidgetsController < ApplicationController
  #skip_before_filter :authenticate, :only => [:new, :create]
  before_filter :authenticate, :except=>[:disabled]

  def index
    @widgets = current_user.widgets.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @widgets }
    end
  end

  def new
    @widget = Widget.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @widget }
    end
  end

  def create
    @widget = Widget.new(params[:widget])
    @widget.user_id = current_user.id
    @widget.score = 0
    @widget.total_score = 0
    @widget.click_number = 0
    @widget.average = 0

    respond_to do |format|
      if @widget.save
        format.html { redirect_to edit_widget_path(@widget), notice: 'Widget was successfully created.' }
        format.json { render json: @widget, status: :created, location: @widget }
      else
        format.html { render action: "new" }
        format.json { render json: @widget.errors, status: :unprocessable_entity }
        raise 'an error occurs when creation'
      end
    end
  end

  def show
    @widget = Widget.find_by_uuid(params[:uuid])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @widget }
    end
  end

  def edit
    @widget = Widget.find_by_uuid(params[:uuid])
  end

  def update
    @widget = Widget.find_by_uuid(params[:uuid])

    respond_to do |format|
      if @widget.update_attributes(params[:widget])
        format.html { redirect_to edit_widget_path(@widget), notice: 'Widget was successfully updated.' }
        format.json { render json: @widget, status: :created, location: @widget }
      else
        format.html { render action: "edit" }
        format.json { render json: @widget.errors, status: :unprocessable_entity }
        raise 'there is an error when alteration'
      end
    end
  end

  def destroy
    @widget = Widget.find_by_uuid(params[:uuid]).destroy

    respond_to do |format|
      format.html { redirect_to widgets_path }
      format.json { head :no_content }
    end
  end

  #generate widget
  def generate
    respond_to do |format|
      format.js {}
    end
  rescue
    #TODO add widget not found page
    render :template => 'application/widget_not_found', :status => :not_found
  end



  protected

  def authenticate
    unless current_user
      redirect_to root_url
    end
  end

end

我的路线文件也许您可以查看它。

Rwidget::Application.routes.draw do

  match 'widgets' => 'widgets#index', :via => :get
  match 'widgets/new' => 'widgets#new', :via => :get
  match 'widgets' => 'widgets#create', :via => :post
  match 'widgets/:uuid' => 'widgets#show', :via => :get
  get 'widgets/:uuid/edit' => 'widgets#edit'
  match 'widgets/:uuid' => 'widgets#update', :via => :put
  match 'widgets/:uuid' => 'widgets#destroy', :via => :delete

  resources :widgets, :collection => [:destroy]

  match 'rws/generate/:uuid' => 'rws#generate'

  get 'rws/:uuid' => 'rws#show'
  put 'rws/:uuid' => 'rws#update'
  post 'rws/getUserInfo' => 'rws#getUserInfo'

  resources :authentications
  match '/auth/:provider/callback' => 'authentications#create'

  devise_for :users do
    get '/users/sign_out' => 'devise/sessions#destroy'
  end

  root :to => "home#index"

我的controller_spec。 rb是

require 'spec_helper'

describe WidgetsController do
  login_user

  describe "User" do
    before(:each) do
      @current_user = mock_model(User, :id => 1)
      @widget = mock_model(Widget, :user_id => 1)
      Widget.stub!(:current_user).and_return(@current_user)
      Widget.stub!(:widgets).and_return(@widget)
    end

    it "should have a current_user" do
      subject.current_user.should_not be_nil
    end
  end

  def mock_widget(stubs={})
    @mock_widget ||= mock_model(Widget, stubs).as_null_object
  end

  describe "Get index" do
    it "should get all widgets " do
      Widget.stub(:all) { [mock_widget] }
      get :index
      assigns(:widgets) == @widgets
    end
  end

  describe "Post widget" do
    it "creates a new widget" do
      Widget.stub(:new).with({'these' => 'params'}) { mock_widget(:language => "en") }
      post :create, :widget => {'these' => 'params'}
      assigns(:widget) == @widgets
      response.should redirect_to (edit_widget_path(@mock_widget))
    end
  end

  describe "Get widget" do
    it "shows exact widget via id" do
      Widget.stub(:find).with("10") { [mock_widget] }
      get :show
      assigns(:mock_widget) == mock_widget
    end
  end

  describe "Put widget" do
    it "updates the widget attributes" do
      Widget.stub(:find).with("6") { [mock_widget] }
      mock_widget.should_receive(:update_attributes).with({'these' => 'params'})
      put :update, :id => "6", :widget => {'these' => 'params'}
    end
  end

  describe "delete destroy" do
    it "destroys the requested widget" do
      Widget.stub(:find).with("10") { [mock_widget] }
      mock_widget.should_receive(:destroy)
      get :destroy, :id => "10"
    end
  end
end

任何我配置我的规范助手来设计设置。 我的controller_macros.rb是

module ControllerMacros
  def login_user
    before(:each) do
      @request.env["devise.mapping"] = Devise.mappings[:user]
      user = Factory(:user)
      #user.confirm! # or set a confirmed_at inside the factory. Only necessary if you are using the confirmable module
      sign_in user
    end
  end
end

我的spec_helper.rb

# This file is copied to spec/ when you run 'rails generate rspec:install'
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'
require 'rspec/autorun'

# Requires supporting ruby files with custom matchers and macros, etc,
# in spec/support/ and its subdirectories.
Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}

RSpec.configure do |config|
  # ## Mock Framework
  #
  # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
  #
  # config.mock_with :mocha
  # config.mock_with :flexmock
  # config.mock_with :rr
  config.include Devise::TestHelpers, :type => :controller
  config.extend ControllerMacros, :type => :controller
  config.include RequestMacros, :type => :request
  # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
  config.fixture_path = "#{::Rails.root}/spec/fixtures"

  # If you're not using ActiveRecord, or you'd prefer not to run each of your
  # examples within a transaction, remove the following line or assign false
  # instead of true.
  config.use_transactional_fixtures = true

  # If true, the base class of anonymous controllers will be inferred
  # automatically. This will be the default behavior in future versions of
  # rspec-rails.
  config.infer_base_class_for_anonymous_controllers = false

end

最后，我的devise.rb在支持文件下，

RSpec.configure do |config|
  config.include Devise::TestHelpers, :type => :controller
end

因此。当我调试我的controller.spec文件时，更新和删除描述块中没有current_user。 当我运行ender$ rspec spec/controllers/widgets_controller_spec.rb时 我面对

Failures:

  1) WidgetsController Put widget updates the widget attributes
     Failure/Error: put :update, :id => "6", :widget => {'these' => 'params'}
     NoMethodError:
       undefined method `update_attributes' for nil:NilClass
     # ./app/controllers/widgets_controller.rb:60:in `block in update'
     # ./app/controllers/widgets_controller.rb:59:in `update'
     # ./spec/controllers/widgets_controller_spec.rb:52:in `block (3 levels) in <top (required)>'

  2) WidgetsController delete destroy destroys the requested widget
     Failure/Error: get :destroy, :id => "10"
     NoMethodError:
       undefined method `destroy' for nil:NilClass
     # ./app/controllers/widgets_controller.rb:72:in `destroy'
     # ./spec/controllers/widgets_controller_spec.rb:60:in `block (3 levels) in <top (required)>'

Finished in 0.4569 seconds
6 examples, 2 failures

Failed examples:

rspec ./spec/controllers/widgets_controller_spec.rb:49 # WidgetsController Put widget updates the widget attributes
rspec ./spec/controllers/widgets_controller_spec.rb:57 # WidgetsController delete destroy destroys the requested widget

我如何解决？

解： 因为搜索uuid，我将findbyid转移到了findbyuuid。在那之后，我需要返回一个数组，我就这样得到了它，

Widget.stub(:find_by_uuid).with("6").and_return(mock_widget(:update_attributes => true))

已经完成了！

Answer 1

在你的规范中，你正在做什么

Widget.stub(:find).with("6")...

但您的应用代码会调用Widget.find_by_uuid。您的规范代码应该删除您的应用代码将执行的调用。同样，您的应用代码需要设置params[:uuid]，但您的规范仅为params[:id]。

您还应该返回正确的返回值 - find_by返回单个对象，但您正在设置的存根返回一个数组。

Widget.stub(:find_by_uuid).with("6") { mock_widget}

将使您的存根返回模拟小部件而不是包含模拟小部件的数组

Answer 2

您只需要查看WidgetCOntroller＃update以了解调用哪个对象'update_attributes'。

  def update
    @widget = Widget.find_by_uuid(params[:uuid])

    respond_to do |format|
      if @widget.update_attributes(params[:widget])

所以，基本上，这个调用返回nil：

Widget.find_by_uuid(params[:uuid])

您可以使用'rails console'进行调试。