gistfile1.rb

module TimeAttributeExtensions
  module ClassMethods

    def define_attribute_methods_with_time_parsing
      if define_attribute_methods_without_time_parsing

        columns_hash.each do |name, column|
          if [:datetime, :timestamp].include?(column.type)
            unless method_defined?(:"#{name}_without_time_parsing=")

              define_method("#{name}_with_time_parsing=") do |time|
                send(:"#{name}_without_time_parsing=", parse_time_from_hash(time))
              end

              alias_method_chain :"#{name}=", :time_parsing
            end
          end
        end

        return true
      end
    end
  end
  
  module InstanceMethods
    def parse_time_from_hash(time)
      # Do time parsing here
    end
  end

  def self.included(receiver)
    receiver.send(:include, InstanceMethods)
    receiver.extend ClassMethods

    unless receiver.respond_to?(:define_attribute_methods_without_time_parsing)
      class << receiver
        alias_method_chain :define_attribute_methods, :time_parsing
      end
    end
  end
end