Rails6.0 | 動画学習サイトを作成| 06 | デバイス（devise） - 学生向けプログラミング入門

[05]ナビゲーションバー(Bulma)　<<　[ホームに戻る]　>> [07]氏名認証

メールとパスワードでの認証を作成します。

記述追加　GemFile(57行目)

gem 'devise'

GemFile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.6.3'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 6.0.3', '>= 6.0.3.1'
# Use postgresql as the database for Active Record
gem 'pg', '>= 0.18', '< 2.0'
# Use Puma as the app server
gem 'puma', '~> 4.1'
# Use SCSS for stylesheets
gem 'sass-rails', '>= 6'
# Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
gem 'webpacker', '~> 4.0'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.7'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use Active Model has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Active Storage variant
# gem 'image_processing', '~> 1.2'

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.4.2', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '~> 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of web drivers to run system tests with browsers
  gem 'webdrivers'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

# Bulma
gem 'bulma-rails', '~> 0.7.4'
gem 'bulma-extensions-rails', '~> 1.0.30'

#デバイス
gem 'devise'

サーバーは「Control+C」でストップできます。

コマンド
bundle

デバイスのインストールをします。

コマンド
rails g devise:install

このときに表示される手順通りに進めていきます。

コマンド(3つ)
rails g devise user

rails g devise:views

rails db:migrate

「config\environments\development.rb」ファイルに以下の記述を追加します。

記述追加　config\environments\development.rb(64行目)

config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }

config\environments\development.rb

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # In the development environment your application's code is reloaded on
  # every request. This slows down response time but is perfect for development
  # since you don't have to restart the web server when you make code changes.
  config.cache_classes = false

  # Do not eager load code on boot.
  config.eager_load = false

  # Show full error reports.
  config.consider_all_requests_local = true

  # Enable/disable caching. By default caching is disabled.
  # Run rails dev:cache to toggle caching.
  if Rails.root.join('tmp', 'caching-dev.txt').exist?
    config.action_controller.perform_caching = true
    config.action_controller.enable_fragment_cache_logging = true

    config.cache_store = :memory_store
    config.public_file_server.headers = {
      'Cache-Control' => "public, max-age=#{2.days.to_i}"
    }
  else
    config.action_controller.perform_caching = false

    config.cache_store = :null_store
  end

  # Store uploaded files on the local file system (see config/storage.yml for options).
  config.active_storage.service = :local

  # Don't care if the mailer can't send.
  config.action_mailer.raise_delivery_errors = false

  config.action_mailer.perform_caching = false

  # Print deprecation notices to the Rails logger.
  config.active_support.deprecation = :log

  # Raise an error on page load if there are pending migrations.
  config.active_record.migration_error = :page_load

  # Highlight code that triggered database queries in logs.
  config.active_record.verbose_query_logs = true

  # Debug mode disables concatenation and preprocessing of assets.
  # This option may cause significant delays in view rendering with a large
  # number of complex assets.
  config.assets.debug = true

  # Suppress logger output for asset requests.
  config.assets.quiet = true

  # Raises error for missing translations.
  # config.action_view.raise_on_missing_translations = true

  # Use an evented file watcher to asynchronously detect changes in source code,
  # routes, locales, etc. This feature depends on the listen gem.
  # config.file_watcher = ActiveSupport::EventedFileUpdateChecker

  # デバイスのメール設定
  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }

end

「app\views\layouts\application.html.erb」ファイルに以下の記述を追加します。

記述追加　app\views\layouts\application.html.erb(16行目)

<p class="notice"><%= notice %></p>
<p class="alert"><%= alert %></p>

app\views\layouts\application.html.erb

<!DOCTYPE html>
<html>
  <head>
    <title>Gakushuu6</title>
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>

    <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
  </head>

  <body>

    <%= render  "shared/navbar" %>

    <p class="notice"><%= notice %></p>
    <p class="alert"><%= alert %></p>

    <%= yield %>
  </body>
</html>

ナビゲーションバーに「新規ユーザ登録」「ログイン」「ログアウト」のリンクを追加します。

記述更新　app\views\shared\_navbar.html.erb
24,25行目、32行目、37行目のリンクを更新し、21,30,40行目に記述を追加しています。
コードをコピーしてファイルの内容を置き換えて下さい。

<nav class="navbar is-link" role="navigation" aria-label="main navigation">

    <div class="navbar-brand">
        <a class="navbar-item" href="/">
            <h1>テストサイトGakushuu6</h1>
        </a>
        <a role="button" class="navbar-burger burger" aria-label="menu" aria-expanded="false" data-target="navbarBasicExample">
            <span aria-hidden="true"></span>
            <span aria-hidden="true"></span>
            <span aria-hidden="true"></span>
        </a>
    </div>

    <div id="navbarBasicExample" class="navbar-menu">
    
        <div class="navbar-end">
            <a class="navbar-item"></a>
            <a class="navbar-item"></a>

            <!-- もしログインしていなかったら-->
            <% if (!user_signed_in?) %>
                <div class="navbar-item">
                    <div class="buttons">
                        <%= link_to  "新規ユーザ登録", new_user_registration_path, class: "button is-info" %>
                        <%= link_to  "ログイン", new_user_session_path, class: "button is-light" %>
                    </div>
                </div>

            <!-- ログインしていたら　-->
            <% else %>
                <div class="navbar-item has-dropdown is-hoverable" style="margin-right: 100px;">
                    <a class="navbar-item"><%= current_user.email %></a>
                    <div class="navbar-dropdown">
                        <a href="" class="navbar-item"></a>
                        <a href="" class="navbar-item"></a>
                        <hr class="navbar-divider">
                        <%= link_to  "ログアウト", destroy_user_session_path, method: :delete, class: "navbar-item" %>
                    </div>
                </div>
            <% end %>

        </div>
    </div>
</nav>

<script>
$(document).ready(function() {
  // navbar burgerアイコンでクリックイベントを確認する
  $(".navbar-burger").click(function() {
      // 「navbar-burger」と「navbar-menu」の両方で「is-active」クラスを切り替えます
      $(".navbar-burger").toggleClass("is-active");
      $(".navbar-menu").toggleClass("is-active");
  });
});
</script>

ルートページを「app\views\pages」フォルダの「home.html.erb」ファイルに設定します。
「config\routes.rb」ファイルに以下の記述を追加します。

記述追加　config\routes.rb(4行目)

root 'pages#home'

config\routes.rb

Rails.application.routes.draw do

  # ルートを　app\views\pages\home.html.erb　に設定
  root 'pages#home'

  devise_for :users

  get 'pages/home'
  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end

ブラウザ確認
http://localhost:3000/

「新規ユーザ登録」ボタンを押します。