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https://stackoverflow.com/questions/18497253/how-to-let-a-non-signed-in-user-access-a-restricted-page-only-once
http://www.google.de/url?url=http://www.rubypigeon.com/posts/how-to-implement-simple-authentication-without-devise/
https://github.com/plataformatec/devise/wiki/How-To:-Email-only-sign-up
https://github.com/plataformatec/devise/wiki/How-To:-Require-authentication-for-all-pages
https://github.com/plataformatec/devise/wiki/How-To:-Display-a-custom-sign_in-form-anywhere-in-your-app
https://github.com/plataformatec/devise/wiki/How-To:-Allow-users-to-sign-in-using-their-username-or-email-address
https://github.com/plataformatec/devise/wiki/How-To:-Set-up-devise-as-a-single-user-system
https://www.theodinproject.com/courses/ruby-on-rails/lessons/sessions-cookies-and-authentication
https://launchschool.com/blog/how-to-use-devise-in-rails-for-authentication
https://devhints.io/devise
https://codepany.com/blog/rails-5-user-accounts-with-3-types-of-roles-devise-rails_admin-cancancan/
https://www.sitepoint.com/devise-authentication-in-depth/
https://medium.com/%40chinnatiptaemkaeo/integrate-omniauth-facebook-to-rails-5-1389d760d92a