devise_for :users,:controllers => {:registrations => 'registrations'}

registrations_controller.rb

Class RegistrationsController < Devise::RegistrationsController
 
  def create
    super
    session[:omniauth] = nil unless @user.new_record?
  end
 
  private
 
  def build_resource(*args)
    super
    if session["devise.omniauth"]
      @user.apply_omniauth(session["devise.omniauth"])
      session["devise.omniauth"] = nil
   end
  end
end

这是我的来自AuthenticationsController的创建方法

def create
    omniauth = request.env["omniauth.auth"]
    authentication = Authentication.find_by_provider_and_uid(omniauth['provider'],omniauth['uid'])
    if authentication
      flash[:notice] = "Signed in successfully."
      sign_in_and_redirect(:user,authentication.user)
    elsif current_user
      current_user.authentications.create!(:provider => omniauth['provider'],:uid => omniauth['uid'])
      flash[:notice] = "Authentication successful."
      redirect_to authentications_url
    else
      user = User.new
      user.apply_omniauth(omniauth)
      if user.save
        flash[:notice] = "Signed in successfully."
        sign_in_and_redirect(:user,user)
      else
        session[:omniauth] = omniauth.except('extra')
        redirect_to new_user_registration_url
      end
    end
end