pseudo code

thingy.rb

class AppConfig < ActiveRecord::Base # Or whatever, its a model
  attr_accessible :homepage_template, :connection_password, :i_dunno_whatever
  
  # bear with me, its all pseudo code
  validates :homepage_template, :presence => true, :inclusion => { :in => MagicalTemplateHelper.homepage_templates }
  validates_presence_of :connection_password
  
  # settings for arbitrary shit we need to set
  # these are way hard to validate
  # and require a lot of conditional b/s 
  # for the application to take them seriously 
  # in terms of behavior
  has_many :settings
  
end