This allows you to do something like this: Say Advertiser is an assoc on banner, you could do something like: Advertiser.first.featured_banners And if you later add a banner type named 'Awesome' you could immediately call Advertiser.first.awesome_banner without writing new code in the model.

method_missing_override.rb

#Here's what I'm using. Maybe you could adapt it to your case. I have this on a Message model.

def method_missing(method_name, *args, &block)
  if method_name =~ /(.*)_recipients$/
	  self.correspondences.where('recipient_type = ?', $1.to_s.humanize)
	  .collect{ |c| c.recipient }.flatten.uniq
	else
	  super
	end
end