ステップ10: タスク一覧を作成日時の順番で並び替えましょう

yaraneba/.rubocop.yml

@@ -2,6 +2,10 @@ inherit_gem:
   fablicop:
     - "config/.base_rubocop.yml"
 
+Rails/DynamicFindBy:
+  Exclude:
+    - 'spec/system/*'
+
 Style/FrozenStringLiteralComment:
   Exclude:
     - 'db/**/*'

yaraneba/app/controllers/tasks_controller.rb

@@ -5,7 +5,7 @@ class TasksController < ApplicationController
 
   # GET /tasks or /tasks.json
   def index
-    @tasks = Task.all
+    @tasks = Task.all.order(created_at: :desc)
   end
 
   # GET /tasks/1 or /tasks/1.json

yaraneba/app/views/tasks/index.html.erb

@@ -10,18 +10,20 @@
       <th><%= I18n.t('tasks.common.status') %></th>
       <th><%= I18n.t('tasks.common.priority') %></th>
       <th><%= I18n.t('tasks.common.end_date') %></th>
+      <th><%= I18n.t('tasks.common.created_at') %></th>
       <th colspan="3"></th>
     </tr>
   </thead>
 
   <tbody>
-    <% @tasks.each do |task| %>
+    <% @tasks.each_with_index do |task, i| %>
       <tr>
-        <td><%= task.title %></td>
-        <td><%= task.detail %></td>
-        <td><%= task.status %></td>
-        <td><%= task.priority %></td>
-        <td><%= task.end_date %></td>
+        <td id="title-<%= i %>"><%= task.title %></td>
+        <td id="detail-<%= i %>"><%= task.detail %></td>
+        <td id="status-<%= i %>"><%= task.status %></td>
+        <td id="priority-<%= i %>"><%= task.priority %></td>
+        <td id="end_date-<%= i %>"><%= task.end_date %></td>
+        <td id="created_at-<%= i %>"><%= task.created_at%></td>
         <td><%= link_to I18n.t('tasks.common.show'), task %></td>
         <td><%= link_to I18n.t('tasks.common.edit'), edit_task_path(task) %></td>
         <td><%= link_to I18n.t('tasks.common.destroy'), task, method: :delete, data: { confirm: I18n.t('tasks.index.confirm') } %></td>

yaraneba/config/locales/views/ja.yml

@@ -6,6 +6,7 @@ ja:
       status: 'ステータス'
       priority: '優先順位'
       end_date: '終了予定日'
+      created_at: '作成日時'
       show: '詳細'
       edit: '編集'
       destroy: '削除'

yaraneba/spec/factories/tasks.rb

@@ -6,5 +6,6 @@
     status { '1' }
     end_date { Date.yesterday }
     deleted_at { nil }
+    sequence(:created_at) { |n| Time.zone.now.since(n.day) }
   end
 end

yaraneba/spec/system/tasks_spec.rb

@@ -3,7 +3,17 @@
 require 'rails_helper'
 
 RSpec.describe 'Tasks', type: :system do
+  let!(:task) { create_list(:task, 10) }
+
   describe '#task' do
+    it 'index task' do
+      visit root_path
+
+      9.times do |i|
+        expect(page.find_by_id("created_at-#{i}").text).to be > page.find_by_id("created_at-#{i + 1}").text
+      end
+    end
+
     it 'create task' do
       visit new_task_path
       fill_in 'task_title', with: 'title'