gistfile1.rb

module AttrStripper
  module Stripper
    
    def self.included(base)
      base.alias_method_chain :write_attribute, :attr_stripper
    end

    def write_attribute_with_attr_stripper(attr, value)
      value = value.dup.strip if value.is_a?(String)
      write_attribute_without_attr_stripper(attr,value)
    end
    
  end
end

ActiveRecord::Base.send :include, AttrStripper::Stripper