3. Criar uma tela de autenticação de usuário em Ruby on Rails

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1. Instalação necessária para Ruby on Rails
4. Criar um Menu para Aplicação em Ruby on Rails
3. Criar uma tela de autenticação de usuário em Ruby on Rails
1. Entrar no projeto rails criado ComputacaoNaPratica
C:\Projetos>cd computacaonapratica
C:\Projetos\computacaonapratica>
#Iniciar o servidor
C:\Projetos\computacaonapratica>rails s
=> Booting WEBrick
=> Rails 4.2.8 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2017-09-13 05:16:16] INFO  WEBrick 1.3.1
[2017-09-13 05:16:16] INFO  ruby 2.2.6 (2016-11-15) [x64-mingw32]
[2017-09-13 05:16:16] INFO  WEBrick::HTTPServer#start: pid=18536 port=3000
Abrir o navegador em http://localhost:3000/
#Parar o servidor
Ctrl + c 
​
Started GET "/" for ::1 at 2017-09-13 05:17:29 -0300
Processing by Rails::WelcomeController#index as HTML
  Rendered C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.8/lib/rails/templates/rails/welcome/index.html.erb (25.7ms)
Completed 200 OK in 272ms (Views: 250.5ms | ActiveRecord: 0.0ms)
[2017-09-13 05:19:46] INFO  going to shutdown ...
[2017-09-13 05:19:46] INFO  WEBrick::HTTPServer#start done.
Exiting
Deseja finalizar o arquivo em lotes (S/N)? S
​
C:\Projetos\computacaonapratica>
​
2. Instalar o bootstrap
Instalar e Abrir o Sublime Text3.
Abrir o arquivo C:\Projetos\computacaonapratica\Gemfile e adicionar
gem 'bootstrap-sass', '~> 3.3.6'
Salvar o arquivo Gemfile.
No prompt executar: 
C:\Projetos\computacaonapratica>bundle install
Fetching gem metadata from https://rubygems.org/...........
Fetching gem metadata from https://rubygems.org/..............
Fetching gem metadata from https://rubygems.org/...
Resolving dependencies...
Using rake 12.1.0
Using i18n 0.8.6
Using minitest 5.10.3
Using thread_safe 0.3.6
Using tzinfo 1.2.3
Using activesupport 4.2.8
Using builder 3.2.3
Using erubis 2.7.0
Using mini_portile2 2.2.0
Using nokogiri 1.8.0 (x64-mingw32)
Using rails-deprecated_sanitizer 1.0.3
Using rails-dom-testing 1.0.8
Using loofah 2.0.3
Using rails-html-sanitizer 1.0.3
Using actionview 4.2.8
Using rack 1.6.8
Using rack-test 0.6.3
Using actionpack 4.2.8
Using globalid 0.4.0
Using activejob 4.2.8
Using mime-types-data 3.2016.0521
Using mime-types 3.1
Using mail 2.6.6
Using actionmailer 4.2.8
Using activemodel 4.2.8
Using arel 6.0.4
Using activerecord 4.2.8
Using execjs 2.7.0
Fetching autoprefixer-rails 7.1.4
Installing autoprefixer-rails 7.1.4
Using debug_inspector 0.0.3
Using binding_of_caller 0.7.2
Using rb-fsevent 0.10.2
Using ffi 1.9.18 (x64-mingw32)
Using rb-inotify 0.9.10
Using sass-listen 4.0.0
Using sass 3.5.1
Using bootstrap-sass 3.3.7
Using bundler 1.16.0.pre.2
Using byebug 9.1.0
Using coffee-script-source 1.12.2
Using coffee-script 2.4.1
Using thor 0.20.0
Using railties 4.2.8
Using coffee-rails 4.1.1
Using concurrent-ruby 1.0.5
Using multi_json 1.12.2
Using jbuilder 2.7.0
Using jquery-rails 4.3.1
Using json 1.8.6
Using sprockets 3.7.1
Using sprockets-rails 3.2.1
Using rails 4.2.8
Using rdoc 4.3.0
Using tilt 2.0.8
Using sass-rails 5.0.6
Using sdoc 0.4.2
Using sqlite3 1.3.13 (x64-mingw32)
Using turbolinks-source 5.0.3
Using turbolinks 5.0.1
Using tzinfo-data 1.2017.2
Using uglifier 3.2.0
Using web-console 2.3.0
Bundle complete! 13 Gemfile dependencies, 62 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
​
C:\Projetos\computacaonapratica>
Verificar que o bootstrap-sass foi instalado
# Configurar o bootstrap
Renomear o arquivo app/assets/stylesheets/application.css para:
app/assets/stylesheets/application.scss
​
Limpar todo o conteúdo do arquivo application.scss 
​
No arquivo application.scss adicionar:
​
@import "bootstrap-sprockets";
@import "bootstrap";
​
Abrir o arquivo app/assets/javascripts/application.js
# Adicionar o bootstrap ABAIXO de //= require jquery
​
//= require jquery
//= require bootstrap-sprockets
#Iniciar o servidor
C:\Projetos\computacaonapratica>rails s
=> Booting WEBrick
=> Rails 4.2.8 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2017-09-13 05:16:16] INFO  WEBrick 1.3.1
[2017-09-13 05:16:16] INFO  ruby 2.2.6 (2016-11-15) [x64-mingw32]
[2017-09-13 05:16:16] INFO  WEBrick::HTTPServer#start: pid=18536 port=3000
Abrir o navegador em http://localhost:3000/​
#Parar o servidor
Ctrl + c 
Started GET "/" for ::1 at 2017-09-13 05:17:29 -0300
Processing by Rails::WelcomeController#index as HTML
  Rendered C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.8/lib/rails/templates/rails/welcome/index.html.erb (25.7ms)
Completed 200 OK in 272ms (Views: 250.5ms | ActiveRecord: 0.0ms)
[2017-09-13 05:19:46] INFO  going to shutdown ...
[2017-09-13 05:19:46] INFO  WEBrick::HTTPServer#start done.
Exiting
Deseja finalizar o arquivo em lotes (S/N)? S
​
C:\Projetos\computacaonapratica>
​
3. Criar a página de login para usuário
## Instalando o Devise
No arquivo Gemfile adicionar:
gem 'devise', '~> 4.2'
Salvar o arquivo Gemfile.
Executar o comando:
C:\Projetos\computacaonapratica>bundle install
Em seguida, executar o comando: 
C:\Projetos\computacaonapratica>rails g devise:install
create  config/initializers/devise.rb
      create  config/locales/devise.en.yml
===============================================================================
​
Some setup you must do manually if you haven't yet:
​
  1. Ensure you have defined default url options in your environments files. Here
     is an example of default_url_options appropriate for a development environment
     in config/environments/development.rb:
​
       config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
​
     In production, :host should be set to the actual host of your application.
​
  2. Ensure you have defined root_url to *something* in your config/routes.rb.
     For example:
​
       root to: "home#index"
​
  3. Ensure you have flash messages in app/views/layouts/application.html.erb.
     For example:
​
       <'p class="notice"><'%= notice %><'/p>
       <'p class="alert"><'%= alert %><'/p>
​
  4. You can copy Devise views (for customization) to your app by running:
​
       rails g devise:views
​
===============================================================================
​
​
# Configurar o Devise
## Adicionar no arquivo config/environments/development.rb:
config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
Salvar o arquivo.
## Adicionar no arquivo config/routes.rb:
root 'pages#home'
Salvar o arquivo.
## Criar a rota
Executar o comando: 
C:\Projetos\computacaonapratica>rake routes
Prefix Verb   URI Pattern       Controller#Action
        new_user_session GET    /users/sign_in(.:format)       devise/sessions#new
            user_session POST   /users/sign_in(.:format)       devise/sessions#create
    destroy_user_session DELETE /users/sign_out(.:format)      devise/sessions#destroy
           user_password POST   /users/password(.:format)      devise/passwords#create
       new_user_password GET    /users/password/new(.:format)  devise/passwords#new
      edit_user_password GET    /users/password/edit(.:format) devise/passwords#edit
                         PATCH  /users/password(.:format)      devise/passwords#update
                         PUT    /users/password(.:format)      devise/passwords#update
cancel_user_registration GET    /users/cancel(.:format)        devise/registrations#cancel
       user_registration POST   /users(.:format)               devise/registrations#create
   new_user_registration GET    /users/sign_up(.:format)       devise/registrations#new
  edit_user_registration GET    /users/edit(.:format)          devise/registrations#edit
                         PATCH  /users(.:format)               devise/registrations#update
                         PUT    /users(.:format)               devise/registrations#update
                         DELETE /users(.:format)               devise/registrations#destroy
                    root GET    /                              pages#home
​
## Criar a pasta app/views/pages
## Criar o arquivo home.html.erb dentro da pasta app/views/pages
Com o seguinte conteúdo:
<p>pages#home</p>
<%= link_to "Log in", new_user_session_path %> | <%= link_to "Log out", destroy_user_session_path, method: :delete %>
Salvar o arquivo.
## Criar o controlador PagesController em app/controller/pages_controller.rb
Com o seguinte conteúdo:
​
class PagesController < ApplicationController
  def home
      
  end
​
end
Salvar o arquivo.
## No arquivo app/views/layouts/application.html.erb:
  <html>
  ...
  
  <body>
     <p class="notice"><%= notice %></p>
     <p class="alert"><%= alert %></p>
     <%= yield %>
  </body>
 </html>
Salvar o arquivo.
# Criar o model User
C:\Projetos\computacaonapratica>rails g devise User
invoke  active_record
      create    db/migrate/20170809005335_devise_create_users.rb
      create    app/models/user.rb
      invoke    test_unit
      create      test/models/user_test.rb
      create      test/fixtures/users.yml
      insert    app/models/user.rb
       route  devise_for :users
# Adicionar no Banco de Dados
rails 4> C:\Projetos\computacaonapratica>rake db:migrate
​
== 20170809005335 DeviseCreateUsers: migrating ================================
-- create_table(:users)
   -> 0.0033s
-- add_index(:users, :email, {:unique=>true})
   -> 0.0019s
-- add_index(:users, :reset_password_token, {:unique=>true})
   -> 0.0013s
== 20170809005335 DeviseCreateUsers: migrated (0.0092s) =======================
# Abrir o programa DB Browser for SQLite que está instalado na máquina
Selecionar o esquema em "Abrir banco de dados" com o arquivo:
C:\Projetos\computacaonapratica/db/development.sqlite3
Abrir a tabela "Users" em Navergar dados > Tabela "User"
# Adicionar as Views
C:\Projetos\computacaonapratica>rails g devise:views
 
Expected boolean default value for '--markerb'; got :erb (string)
      invoke  Devise::Generators::SharedViewsGenerator
      create    app/views/devise/shared
      create    app/views/devise/shared/_links.html.erb
      invoke  form_for
      create    app/views/devise/confirmations
      create    app/views/devise/confirmations/new.html.erb
      create    app/views/devise/passwords
      create    app/views/devise/passwords/edit.html.erb
      create    app/views/devise/passwords/new.html.erb
      create    app/views/devise/registrations
      create    app/views/devise/registrations/edit.html.erb
      create    app/views/devise/registrations/new.html.erb
      create    app/views/devise/sessions
      create    app/views/devise/sessions/new.html.erb
      create    app/views/devise/unlocks
      create    app/views/devise/unlocks/new.html.erb
      invoke  erb
      create    app/views/devise/mailer
      create    app/views/devise/mailer/confirmation_instructions.html.erb
      create    app/views/devise/mailer/email_changed.html.erb
      create    app/views/devise/mailer/password_change.html.erb
      create    app/views/devise/mailer/reset_password_instructions.html.erb
      create    app/views/devise/mailer/unlock_instructions.html.erb
​
​
# Iniciar o servidor e cadastrar um novo usuário
C:\Projetos\computacaonapratica>rails s
Acessar a página http://localhost:3000/users/sign_up​
​


Cadastrar um novo usuário


# O sistema direciona para a página Home.


Verificar no banco de dados se o usuário foi criado com sucesso.


# Fazer o log out.


# Fazer o login


# Mensagem de login com sucesso
DICA: Se houver algum erro "cannot load such file -- bcrypt_ext", precisa alterar no arquivo Gemfile da raíz do projeto
gem 'bcrypt', git: 'https://github.com/codahale/bcrypt-ruby.git', 
:require => 'bcrypt'
2. Criar um projeto em Ruby on Rails
4. Criar um Menu para Aplicação em Ruby on Rails
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Outline
1. Entrar no projeto rails criado ComputacaoNaPratica
2. Instalar o bootstrap
3. Criar a página de login para usuário