Rails教程第10.3.3-4章RSpec错误(应用程序工作)

Question

我收到了4个RSpec错误，这些错误与Will-Paginate宝石有关，但对于我来说，我无法弄清楚它们所指的是什么。不过，这款应用运行得很好。

Failures:

  1) UsersController GET 'index' for signed-in users should be successful
     Failure/Error: get :index
     NoMethodError:
       undefined method `paginate' for #<Class:0x9580710>
     # ./app/controllers/users_controller.rb:7:in `index'
     # ./spec/controllers/users_controller_spec.rb:30:in `block (4 levels) in <top (required)>'

  2) UsersController GET 'index' for signed-in users should have the right title
     Failure/Error: get :index
     NoMethodError:
       undefined method `paginate' for #<Class:0x9580710>
     # ./app/controllers/users_controller.rb:7:in `index'
     # ./spec/controllers/users_controller_spec.rb:35:in `block (4 levels) in <top (required)>'

  3) UsersController GET 'index' for signed-in users should have an element for each user
     Failure/Error: get :index
     NoMethodError:
       undefined method `paginate' for #<Class:0x9580710>
     # ./app/controllers/users_controller.rb:7:in `index'
     # ./spec/controllers/users_controller_spec.rb:40:in `block (4 levels) in <top (required)>'

  4) UsersController GET 'index' for signed-in users should paginate users
     Failure/Error: get :index
     NoMethodError:
       undefined method `paginate' for #<Class:0x9580710>
     # ./app/controllers/users_controller.rb:7:in `index'
     # ./spec/controllers/users_controller_spec.rb:47:in `block (4 levels) in <top (required)>'

Finished in 3.12 seconds
80 examples, 4 failures

我的users_controller.rb文件：

class UsersController < ApplicationController
  before_filter :authenticate, :only => [:index, :edit, :update]
  before_filter :correct_user, :only => [:edit, :update]

  def index
    @title = "All users"
    @users = User.paginate(:page => params[:page])
  end

  def show
    @user = User.find(params[:id])
    @title = @user.name + "<script>"
  end

  def new
    @user = User.new
    @title = "Sign up"
  end

  def create
    @user = User.new(params[:user])
    if @user.save
      sign_in @user
      flash[:success] = "Welcome to the Sample App!"
      redirect_to @user
    else
      @title = "Sign up"
      render 'new'
    end
  end

  def edit
    @user = User.find(params[:id])
    @title = "Edit user"
  end

  def update
    @user = User.find(params[:id])
    if @user.update_attributes(params[:user])
      flash[:success] = "Profile updated."
      redirect_to @user
    else
      @title = "Edit user"
      render 'edit'
    end
  end

  private

    def authenticate
      deny_access unless signed_in?
    end

    def correct_user
      @user = User.find(params[:id])
      redirect_to(root_path) unless current_user?(@user)
    end
end

我的users_controller_spec.rb文件：

require 'spec_helper'

describe UsersController do
  render_views

  describe "GET 'index'" do

    describe "for non-signed-in users" do
      it "should deny access" do
        get :index
        response.should redirect_to(signin_path)
        flash[:notice].should =~ /sign in/i
      end
    end

    describe "for signed-in users" do

      before(:each) do
        @user = test_sign_in(Factory(:user))
        second = Factory(:user, :name => "Bob", :email => "another@example.com")
        third  = Factory(:user, :name => "Ben", :email => "another@example.net")

        @users = [@user, second, third]
        30.times do
          @users << Factory(:user, :email => Factory.next(:email))
        end
      end

      it "should be successful" do
        get :index
        response.should be_success
      end

      it "should have the right title" do
        get :index
        response.should have_selector("title", :content => "All users")
      end

      it "should have an element for each user" do
        get :index
        @users[0..2].each do |user|
          response.should have_selector("li", :content => user.name)
        end
      end

      it "should paginate users" do
        get :index
        response.should have_selector("div.pagination")
        response.should have_selector("span.disabled", :content => "Previous")
        response.should have_selector("a", :href => "/users?page=2",
                                           :content => "2")
        response.should have_selector("a", :href => "/users?page=2",
                                           :content => "Next")
      end     
    end
  end

  describe "Get 'show'" do

    before(:each) do
      @user = Factory(:user)
    end

    it "should be successfull" do
      get :show, :id => @user
      response.should be_success
    end

    it "should find the right user" do
      get :show, :id => @user
      assigns(:user).should == @user
    end

     it "should have the right title" do
      get :show, :id => @user
      response.should have_selector("title", :content => @user.name)
    end

    it "should include the user's name" do
      get :show, :id => @user
      response.should have_selector("h1", :content => @user.name)
    end

    it "should have a profile image" do
      get :show, :id => @user
      response.should have_selector("h1>img", :class => "gravatar")
    end
  end

  describe "GET 'new'" do

    it "should be successful" do
      get :new
      response.should be_success
    end

    it "should have the right title" do
      get :new
      response.should have_selector("title", :content => "Sign up")
    end
  end

  describe "POST 'create'" do
    describe "failure" do

      before(:each) do
        @attr = { :name => "", :email => "", :password => "",
                  :password_confirmation => "" }
      end

      it "should not create a user" do
        lambda do
          post :create, :user => @attr
        end.should_not change(User, :count)
      end

      it "should have the right title" do
        post :create, :user => @attr
        response.should have_selector("title", :content => "Sign up")
      end

      it "should render the 'new' page" do
        post :create, :user => @attr
        response.should render_template('new')
      end
    end

    describe "success" do

      before(:each) do
        @attr = { :name => "New User", :email => "user@example.com", :height => "192cm",
                  :password => "foobar", :password_confirmation => "foobar" }
      end

      it "should create a user" do
        lambda do
          post :create, :user => @attr
        end.should change(User, :count).by(1)
      end

      it "should sign the user in" do
        post :create, :user => @attr
        controller.should be_signed_in
      end

      it "should redirect to the user show page" do
        post :create, :user => @attr
        response.should redirect_to(user_path(assigns(:user)))
      end

      it "should have a welcome message" do
        post :create, :user => @attr
        flash[:success].should =~ /welcome to the sample app/i
      end
    end
  end

  describe "GET 'edit'" do

    before(:each) do
      @user = Factory(:user)
      test_sign_in(@user)
    end

    it "should be successful" do
      get :edit, :id => @user
      response.should be_success
    end

    it "should have the right title" do
      get :edit, :id => @user
      response.should have_selector("title", :content => "Edit user")
    end

    it "should have a link to change the Gravatar" do
      get :edit, :id => @user
      gravatar_url = "http://gravatar.com/emails"
      response.should have_selector("a", :href => gravatar_url,
                                         :content => "change")
    end
  end

  describe "PUT 'update'" do

    before(:each) do
      @user = Factory(:user)
      test_sign_in(@user)
    end

    describe "failure" do

      before(:each) do
        @attr = { :email => "", :name => "", :password => "",
                  :password_confirmation => "" }
      end

      it "should render the 'edit' page" do
        put :update, :id => @user, :user => @attr
        response.should render_template('edit')
      end

      it "should have the right title" do
        put :update, :id => @user, :user => @attr
        response.should have_selector("title", :content => "Edit user")
      end
    end

    describe "success" do

      before(:each) do
        @attr = { :name => "New Name", :email => "user@example.org",
                  :password => "barbaz", :password_confirmation => "barbaz" }
      end

      it "should change the user's attributes" do
        put :update, :id => @user, :user => @attr
        @user.reload
        @user.name.should  == @attr[:name]
        @user.email.should == @attr[:email]
      end

      it "should redirect to the user show page" do
        put :update, :id => @user, :user => @attr
        response.should redirect_to(user_path(@user))
      end

      it "should have a flash message" do
        put :update, :id => @user, :user => @attr
        flash[:success].should =~ /updated/
      end
    end
  end

  describe "authentication of edit/update pages" do

    before(:each) do
      @user = Factory(:user)
    end

    describe "for non-signed-in users" do

      it "should deny access to 'edit'" do
        get :edit, :id => @user
        response.should redirect_to(signin_path)
      end

      it "should deny access to 'update'" do
        put :update, :id => @user, :user => {}
        response.should redirect_to(signin_path)
      end
    end

    describe "for signed-in users" do

      before(:each) do
        wrong_user = Factory(:user, :email => "user@example.net")
        test_sign_in(wrong_user)
      end

      it "should require matching users for 'edit'" do
        get :edit, :id => @user
        response.should redirect_to(root_path)
      end

      it "should require matching users for 'update'" do
        put :update, :id => @user, :user => {}
        response.should redirect_to(root_path)
      end
    end

  end
end

我知道这与定义分页方法有关，但我在教程中找不到(或理解)任何与此相关的内容。欢迎任何帮助。

Answer 1

您需要将will_paginate gem添加到您的Gemfile中(并确保它位于Gemfile的主要部分，而不是group :development块中的)：

gem 'will_paginate', '3.0.pre2'

然后运行bundle install以确保其已安装。那么你的规格应该会通过。

Answer 2

http://ruby.railstutorial.org/chapters/rails-3-1#sec-will_paginate

应该能行得通。那个版本的will_paginate有一个bug。不过，这是一个快速解决方案。看看这个url。