《Ruby on Rails 教程》第 3 章

创建演示应用

rails new sample_app_1 --database=mysql
cd sample_app_1
bundle install --without production
配置 `config/database.yml`
bin/rails db:create
bin/rails test
bin/rails s

打开 http://127.0.0.1:3000

生成静态页面

生成 StaticPages 控制器

bin/rails generate controller StaticPages home help

撤销操作

rails generate controller StaticPages home help
rails destroy controller StaticPages home help

rails generate model User name:string email:string
rails destroy model User

rails db:migrate
rails db:rollback
如果要回到最开始的状态，可以使用：
rails db:migrate VERSION=0

修改静态页面的内容

编辑 app/views/static_pages/home.html.erb，修改内容

<h1>Sample App</h1>
<p>
    This is the home page for the
    <a href="https://www.railstutorial.org/">Ruby on Rails Tutorial</a>
    sample application.
</p>

编辑 app/views/static_pages/help.html.erb

<h1>Help</h1>
<p>
    Get help on the Ruby on Rails Tutorial at the
    <a href="https://www.railstutorial.org/help">Rails Tutorial Help page</a>.
    To get help on this sample app, see the
    <a href="https://www.railstutorial.org/book"><em>Ruby on Rails Tutorial</em>
    book</a>.
</p>

编辑 config/routes.rb，增加 root

Rails.application.routes.draw do
  get 'static_pages/home'
  get 'static_pages/help'
  root "static_pages#home"
end

开始测试

编辑 test/controllers/static_pages_controller_test.rb，给 about 页面添加测试代码

require "test_helper"

class StaticPagesControllerTest < ActionDispatch::IntegrationTest
  test "should get home" do
    get static_pages_home_url
    assert_response :success
  end

  test "should get help" do
    get static_pages_help_url
    assert_response :success
  end

  test "should get about" do
    get static_pages_about_url
    assert_response :success
  end
end

bin/rails test

测试失败

需要 Controller 添加 about 方法，添加页面 about.html.erb，添加路由，才能通过测试。

测试页面标题

编辑 test/controllers/static_pages_controller_test.rb，添加测试代码

require "test_helper"

class StaticPagesControllerTest < ActionDispatch::IntegrationTest
  def setup
    @base_title = "Ruby on Rails Tutorial Sample App"
  end

  test "should get home" do
    get static_pages_home_url
    assert_response :success
    assert_select "title", "Home | #{@base_title}"
  end

  test "should get help" do
    get static_pages_help_url
    assert_response :success
    assert_select "title", "Help | #{@base_title}"
  end

  test "should get about" do
    get static_pages_about_url
    assert_response :success
    assert_select "title", "About | #{@base_title}"
  end
end

同时在这三个页面中需要添加对应的 title

代码：gitee.com/huzhengen/s…