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Link:
https://launchschool.com/blog/how-to-use-devise-in-rails-for-authentication

- Criando generates no devise
Link:
https://github.com/plataformatec/devise/wiki/Tool:-Generate-and-customize-controllers

- Criar role Admin no devise
Link:
https://github.com/plataformatec/devise/wiki/How-To:-Add-an-Admin-Role

- Rails Authorization
Link:
http://railsapps.github.io/rails-authorization.html