facebook.rb

def self.authenticate(controller)
  if can_authenticate?(controller)
    token = controller.params[:token]
    account_attributes = controller.params[:account_attributes)
    identity = self.find_or_initialize_by(uid: retrieve_uid(account_attributes))
    identity.token = token
    
    if controller .current_account
      with_account(identity, controller, account_attributes)
    else
      without_account(identity, controller, account_attributes)
    end
  end
end