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Devise is a flexible authentication solution for Rails. It is a complete MVC solution based on Rails engines. It allows you to have multiple models signed in at the same time. It hashes and stores a password in the database to validate the authenticity of a user while signing in. The authentication can be done both through POST requests or HTTP Basic Authentication.

This ultimate feature of Ruby on Rails development makes your application more secure than other platforms.

STEP 1: gem 'devise' install

                                 

STEP 2: run bundle install

 

STEP 3: run rails generate devise:install

 

rails generate deviserun STEP 4: :views

 

Let’s see an example of STEP 5: application in which need 2 models assuming one is member model and the other is contact model. So now we are going to create our member model using devise:

run rails generate devise member

The migration file will be located in

db/migrate/ devise_create_members.rb.

 

 

rake that, you should have to runAfter STEP 6: db:create (For creating new database)

 

rake runSTEP 7: db:migrate

Once you run the db:migrate command, rails will create a table called members with the following field that the Devise specified in the migration file. Check the tables have created successfully.

STEP 8: run the server by typing “rails server” and copy and paste the 1 and 2 addresses to your browser search bar.

1- http://0.0.0.0:3000/members/sign_up

2- http://0.0.0.0:3000/members/sign_in

 

STEP 9: run rails generate migration add_username_to_members username:string

We have to add the username to the sign-up form. This command will generate another migration file in your “db/migrate” directory.

 

rake runSTEP 10: db:migrate

 

STEP 11: run rails generate model contact

 

Edit the migration file of contact and specify the 2 fields as shown below.

 

Open db/migrate/ 20180312073055_create_contacts.rb.

 

STEP 12: run rake db:migrate

STEP 13: run rails generate controller home

 

And then create a new index file for the home controller like “app/views/home/index.html.erb” and then add the following.

 

 

STEP 14: Once you have done, open app/config/routes.rb

add this line

 

root :to =>'home#index'

 

STEP 15: run rails generate controller registration

Open “app/controllers/registration_controller.rb” and then edit the file as shown below.

 

 

STEP 16: We have to mention the relationships between 2 models (member, contact). Here the relationship will be as follows.

Open_Filepath: app/models/member.rb

 

 

Open_Filepath: app/models/contact.rb

 

 

STEP 17: Now refer the registration controller file in app/controllers/registration, here after completing the registration & the values that the member entered is stored in the table successfully I just redirected the member to the dashboard page. So we have to add that page to our home controller.

 

Open_Filepath: app/views/home/dashboard.html.erb

 

Open app/config/routes.STEP 18: rb and you have to specify this path in our routes.rb file.

 

STEP 19: run “rails s” and go to http://localhost:3000 address to your browser search bar.