order.rb

def self.statuses
  Order.all.collect{|x| x.status}.uniq
end
# Currently : STATUSES = ["SHIPPED", "PROCESSING", "RECEIVED", "INCOMPLETE", "VOIDED", "REFUNDED", "FRAUDULENT", "ON HOLD"]

validates_inclusion_of :status, :in => statuses
statuses.map{|x| x.downcase.gsub(" ", "_")}.each { |s| named_scope s, :conditions => { :status => s } }

### JOSH PREFERS
named_scope :with_status, lambda{|s| { :conditions => { :status => s } } }

# > Order.with_status('shipped')
# > Order.with_status(['shipped', 'processing'])