Metaprogramming I did today

what_did_you_do_today.rb

# Question: can you tell what's going on here?

classes = subclasses_of(ActiveRecord::Base)

classes.each do |klass|
  klass.class_eval do
    before_save do |record|
      record.class.columns.each do |c|
        if ( (c.type == :datetime) && (record.send("#{c.name}_changed?")) && record.send("#{c.name}").present? )
          unmunged_datetime = record.send(c.name) + 5.hours
          record.send("#{c.name}=", unmunged_datetime)
        end 
      end 
    end
  end
end

For all active record models, save time + 5.hours if you happen to be updating any datetime columns...

Though, at first glance it seems like it may not be particularly performance friendly & could clobber existing before_save functionality?

Exactly. :)

That's an interesting thought RE performance (we don't have enough data to really have a hit). And umm I didn't think about clobbering existing before_save filters (in our case it wasn't an issue, but very good point)