目录：http://ruby-china.org/topics/7770 上一步：使用 RSpec+Capybara 简单 BDD 入门 -10

用户故事

用户希望对帖子进行回复

环境准备

git checkout -b f11
rails c # console
rails s # server

步骤

编辑spec/features/guest_can_see_topic_info_spec.rb，增加回复 form 的验证部分

scenario '应该显示回复用的form' do
  visit "/topics/#{@topic.id}"

  page.should have_field 'reply_content'
  page.should have_button '提交回复'
end

• 测试失败：expected to find field "replay_content" but there were no matches
• 原因：没有实现的代码

编辑topics/show.html.haml

拷贝ui/topic.html中回复 form 的部分至当前模板

%section#reply.box
  %form(action="" method="post")
    %textarea(rows="4")
    %input(type="submit" class="btn btn-primary" value="提交回复")

修改为

%section#reply.box
  = form_for [@topic, Reply.new] do |f|
    = f.text_area :content, rows: 4
    = f.submit "提交回复", class: "btn btn-primary"

• 测试失败：undefined methodtopic_replies_path' for #<#<Class:0x007fc0f8`
• 原因：没有设置路由信息

编辑config/routes.rb，增加嵌套的 replay 的路由设置

resources :topics, only: [:index, :show, :new, :create] do
  resources :replies, only: [:create]
end

• 测试通过！

增加提交回复的测试用例

scenario '输入回复内容点击"提交回复"后，正常提交回复' do
  visit "/topics/#{@topic.id}"

  fill_in 'reply_content', with: "回复测试"
  click_button "提交回复"

  current_path.should == topic_path(@topic)
  page.should have_content "回复测试"
end

• 测试失败：uninitialized constant RepliesController
• 原因：没有replies这个controller

在rails console中执行

[34] pry(main)> generate "controller replies"
      create  app/controllers/replies_controller.rb
      invoke  haml
      create    app/views/replies
=> "Completed"
[35] pry(main)>

• 测试失败：The action 'create' could not be found for RepliesController
• 原因：没有create方法

编辑controllers/replies_controller.rb，增加create方法

def create
end

• 测试失败：Missing template replies/create, application/create with {:local...
• 原因：没有replies/create模板

编辑controllers/replies_controller.rb，增加实际逻辑

class RepliesController < ApplicationController
  def create
    topic = Topic.find(params[:topic_id])
    reply = topic.replies.build params[:reply]
    reply.user = current_user
    reply.save

    redirect_to topic
  end
end

• 测试通过！

完成，提交代码

git add .
git commit 
git checkout dev
git merge f11 --no-ff
git branch -d f11

!! 全部完成!!