heartcombo--devise/lib/devise/models/omniauthable.rb

require 'devise/omniauth'

module Devise
  module Models
    # Adds OmniAuth support to your model.
    #
    # == Options
    #
    # Oauthable adds the following options to devise_for:
    #
    #   * +omniauth_providers+: Which providers are avaialble to this model. It expects an array:
    #
    #       devise_for :database_authenticatable, :omniauthable, :omniauth_providers => [:twitter]
    #
    module Omniauthable
      extend ActiveSupport::Concern

      module ClassMethods
        Devise::Models.config(self, :omniauth_providers)
      end
    end
  end
end