Rails and Devise

Devise is a useful authentication library. This repository follow the GoRails tutorial.

installation

gem install devise
bundle install

setup

after run this below command, follow the suggestion 5 steps in console

rails generate devise:install

generate User tables by devise helper

rails generate devise user
rake db:migrate

Routes

on file routes.rb we will get this line

devise_for :users

check routes by rails routes.

• new_user_registration_path register new user
• new_user_session_path login user
• destroy_user_session_path log out user

Custom Devise’s Views

• rails generate devise:views
• go to app/views/devise/

  Helper

  View

• <%= notice %> notice message from devise such as ‘login success’
• <%= alert %> alert or error message from devise such as ‘need to login`
• <% if user_signed_in? %>
• <%= current_user %> such as <%= current_user.email %>

Controller

check user session before access

class BooksController < ApplicationController
before_action :authenticate_user!, except: [:index, :show]

create Book with current user

# app/models/user.rb
class User < ApplicationRecord
...
  has_many :books
...

# app/models/book.rb
class Book < ApplicationRecord
...
  belongs_to :books
...

class BooksController < ApplicationController
...
  def create
    # @book = Book.new(book_params) # original
    @book = current_user.books.new(book_params) # can use current_user for create books
  ...
  end
...

Resource

• User Authentication in Rails with Devise