xml_hidden plugin

Recently I've been investigating the steps needed to open up FilmAmora's API to the outside world. That means supplying xml data so people can do what they want with it.
But I didn't want sensitive data in models to be exposed in the xml. And I also am too lazy to write custom to_xml methods for everything.

So I wrote a plugin call xml_hidden That lets you set something on the class to hide certain attributes from xml output.

class Film < ActiveRecord::Base
  attr_xml_hidden :acquiring_url, :id, :created_at
end

Now whenever I output a film to xml those values can't be seen.