pulling devise api key out of request

devise-iphone.rb

class ApplicationController < ActionController::Base
  protect_from_forgery

  prepend_before_filter :get_api_key

# devise will look for params[:api_key] automatically. it might need to be configured in devise.rb
  private
  def get_api_key
    if api_key = params[:api_key].blank? && request.headers["X-API-KEY"]
      params[:api_key] = api_key
    end
  end
end