sanitizer.rb

module Sanitizer
  extend ActiveSupport::Concern
  
  module ClassMethods
    def sanitize(*args, opts)
      
      target = opts[:on]
      condition = opts[:if] || true
      
      args.each do |column|
        class_eval <<-RUBY
          def #{column}=(value)
            #{target}.send("#{column}=", Sanitize.clean(value)) if #{condition}.call
          end  
        RUBY
      end
    end
  end
end