installing rails 4:
gem install rails --version 4.0.0.rc1 --no-ri --no-rdoc
creating a new rails application:
rails new myapp
uncomment this line:
gem 'therubyracer', platforms: :ruby
put devise on your Gemfile:
gem 'devise', git: 'https://github.com/plataformatec/devise.git'
Running bundle command to install the gem:
bundle
Installing devise on rails app:
rails g devise:install
Creating a devise model with yours modules:
rails generate devise User
If you want, it’s possible to use Admin model.
Run the migrations and now we have devise configured:
rake db:migrate
That’s it.