Question

我在railstutorial.org第7章的练习4中遇到了麻烦。

以下是测试：

    describe "signup" do
    before { visit signup_path }

    describe "with invalid information" do
        it "should not create a user" do
            expect { click_button "Create my Account".not_to change(User, :count) }
        end
    end

    describe "error messages" do
        before { click_button "Create my account" }

        it { should have_selector('title', text: "Sign up") }
        it { should have_content('error') }
    end

    describe "with valid information" do
        before do
            fill_in "Name", with: "Example User"
            fill_in "Email", with: "user@example.com"
            fill_in "Password", with: "foobar"
            fill_in "Confirmation", with: "foobar"
        end

        it "should create a user" do
            expect do
                click_button "Create my account"
            end.to change(User, :count).by(1)
        end
    end

    describe "after saving the user" do
        before { click_button "Create my account" }
        let(:user) { User.find_by_email('user@example.com') }

        it { should have_selector('title', text: user.name) }
        it { should have_selector('div.alert.alert-success', text: 'Welcome') }
    end
end

以下是它应该测试的内容，users_controller.rb：

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

以下是show.html.erb代码：

<% provide(:title, @user.name) %>
<div class="row">
<aside class="span4">
    <section>
        <h1>
            <%= gravatar_for @user %>
            <%= @user.name %>
        </h1>
    </section>
</aside>
</div>

当我运行测试时，我得到了这个：

$ bundle exec rspec spec/requests/user_pages_spec.rb 
........FF

Failures:

  1) User Pages signup after saving the user 
 Failure/Error: it { should have_selector('title', text: user.name) }
 NoMethodError:
   undefined method `name' for nil:NilClass
 # ./spec/requests/user_pages_spec.rb:57:in `block (4 levels) in <top (required)>'

  2) User Pages signup after saving the user 
 Failure/Error: it { should have_selector('div.alert.alert-success', text: 'Welcome') }
   expected css "div.alert.alert-success" with text "Welcome" to return something
 # ./spec/requests/user_pages_spec.rb:58:in `block (4 levels) in <top (required)>'

Finished in 0.86152 seconds
10 examples, 2 failures

Failed examples:

rspec ./spec/requests/user_pages_spec.rb:57 # User Pages signup after saving the user 
rspec ./spec/requests/user_pages_spec.rb:58 # User Pages signup after saving the user

它应该将测试用户保存到测试数据库，但由于某种原因，user.name结果为零。有什么想法吗？

谢谢！

Answer 1

如果不详细检查您的代码以了解所有内容的背景，那么user.name不会返回nil，而user是nil，因此没有方法/属性name，如下所示：

undefined method `name' for nil:NilClass

在定义符号:user：

的测试用例之前，您有这一行

let(:user) { User.find_by_email('user@example.com') }

但是你在测试中引用了对象user：

it { should have_selector('title', text: user.name) }

将前一个符号:user更改为user，您的测试应该通过。

Rails教程第7章，练习4

1 个答案: