user.rb

class User < ActiveRecord::Base
  attr_accessible :image, :name, :provider, :screen_name, :uid

  def self.find_or_create_with_omniauth(auth)
    user = User.find_by_provider_and_uid(auth["provider"], auth["uid"])
    unless user
      user = User.new
      user[:provider] = auth["provider"]
      user[:uid] = auth["uid"]

      unless auth["info"].blank?
        user[:name] = auth["info"]["name"]
        user[:screen_name] = auth["info"]["nickname"]
        user[:image] = auth["info"]["image"]
      end

      user.save
    end

    user
  end
end