app/controllers/callbacks_controller.rb

#
# Licensed to the Apache Software Foundation (ASF) under one
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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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class CallbacksController < Devise::OmniauthCallbacksController
  def facebook
    @user = User.from_omniauth(request.env['omniauth.auth'])
    sign_in_and_redirect @user
  end

  def google_oauth2
    @user = User.from_omniauth(request.env['omniauth.auth'])
    sign_in_and_redirect @user
  end
end