Ruby on Rails Authentication Cheatsheet

Secure user authentication in ruby on rails is discussed here.

Implementing authentication in a typical Rails application is made easy and secure with devise gem.

Install it using:

   gem 'devise'

Then install it to the user model:

   rails generate devise:install

Next, specify which resources (routes) require authenticated access in your routes, config/routes.rb:

    Rails.application.routes.draw do
      authenticate :user do
        resources :something do  # these resource require authentication
         ...
        end
      end
  
      devise_for :users # sign-up/-in/out routes

      root to: 'static#home' # no authentication required
  
    end

To make authentication secure, enforce higher password complexity and allow TLS connections only.