what is devise ? and how to use devise gem

 


 Q => What is the devise And how to use devise gem in rails ?

Devise is a well known solution for authentication in Rails applications. It's full featured (it not only adds authentication but also password recovery, email changing, session timeout, locking, ip tracking, etc.) and can be expanded to add even more (like JWT authentication).



Create a new Rails project:


   rails new Demo


Add the Devise gem to your Gem file:


   gem 'devise'



Run this commend to install the gem.
   

   $ bundle install


Run the Devise installation generator:


  rails generate devise:install


 Make sure you have defined default url options in your environments files. Open up config/environments/development.rb and add this line:


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



Generate a User model:


rails generate devise User


Run database migrations:


rails db:migrate


Customize the Devise views:


rails generate devise:views



Controller filters and helpers

Devise will create some helpers to use inside your controllers and views. To set up a controller with user authentication, just add this before_action (assuming your devise model is 'User'):


before_action :authenticate_user!


To verify if a user is signed in, use the following helper:


user_signed_in?


For the current signed-in user, this helper is available:

   
    current_user


You can access the session for this scope:


    user_session

Comments

Post a Comment

Popular posts from this blog

Rails Create new Project

Image
 Rails Create New Project first you create a new project commend is:   rails@rails-dell : ~/Desktop$ rails new blog Add the blog folder in file    rails@rails-dell : ~/Desktop$ cd blog rails@rails-dell : ~/Desktop/blog$ Go to visual studio code see And see The rails application:- generate model in rails application:-   rails@rails-dell : ~/Desktop/blog$ rails g model Message title: string description:text See this in the terminal :- invoke  active_record       create    db/migrate/20230213145830_create_messages.rb       create    app/models/message.rb       invoke    test_unit       create      test/models/message_test.rb       create      test/fixtures/messages.yml Let's create migrate   rails@rails-dell : ~/Desktop/blog$ rails db:migrate See this in the terminal :- == 20230213145830 CreateMessages: migratin...
Read more

Ruby Variable

Image
 Ruby Variable  Ruby have a four type variable - 1. Local Variable 2. Instance Variable 3. Class Variable 4. Global Variable 1. Local variable                                        A Local variable name  start with  lowercase letter(a-z) or underscore (_)  .  Local variables are not available outside the methods. There is no need to initialize the local variables . Example    age = 21 _Age = 22 2. Instance variable                                                    An instance variable name starts with a @ sign. It belongs to one instance of the class and can be accessed from any instance of the class within a method. They only have limited access to a particular instance of a class.  There is no need t...
Read more