require 'dm-core'

module DataMapper

  module Trimmer
    
    def self.included(base)
      base.class_eval do
        alias_method :set_without_trimmer!, :set!
        alias_method :set!, :set_with_trimmer!
      end
    end
    
    def set_with_trimmer!(name, value)
      value = value.strip if value.respond_to?(:strip)
      value = nil if value.respond_to?(:empty?) && value.empty?
      set_without_trimmer!(name, value)
    end

  end

  Property.send(:include, Trimmer)
  
end