redone.rb

named_scope :in_default_region, lambda{ {
        :include => :region,
        :conditions => ['regions.id = ?', Region.default]
      }}
 
named_scope :regional_and_or_default, lambda{ |key| {
        :include => [:region],
        :conditions => ['association = ? AND ( region_id = ? OR region_id = ? )', key, self.current_region, Region.default],
        :order => "FIELD(region_id, #{id_or_null( self.current_region )}, #{id_or_null( Region.default )})"
      } }
      
      
      def self.regional_or_default(key)
        self.current_region ? self.regional_and_or_default(key).first : self.in_default_region.by_association(key).first
      end