app/models/feed_item.rb

   1 class FeedItem < ActiveRecord::Base
   2   validates_presence_of :feed_name, :title, :description
   3   validates_uniqueness_of :title, :scope => :feed_name
   4   validate :feed_name_must_be_legal
   5
   6   def FeedItem.valid_feed_name?(feed_name)
   7     Rack::Utils::escape(feed_name) == feed_name and
   8       Rack::Utils::unescape(feed_name) == feed_name and
   9       feed_name != 'index' and
  10       feed_name != 'show' and
  11       feed_name != 'update' and
  12       feed_name != 'action'
  13   end
  14
  15   private
  16
  17   def feed_name_must_be_legal
  18     unless FeedItem.valid_feed_name?(feed_name)
  19       errors.add(:feed_name, 'is invalid')
  20     end
  21   end
  22 end