create.rb

  def create
    logout_keeping_session!
    if using_open_id?
      authenticate_with_open_id(params[:openid_url], :return_to => open_id_create_url, 
        :required => [:nickname, :email]) do |result, identity_url, registration|
        if result.successful?
          create_new_user(:identity_url => identity_url, :login => registration['nickname'], :email => registration['email'])
        else
          failed_creation(result.message || "Sorry, something went wrong")
        end
      end
    else
      create_new_user(params[:user])
    end
  end