How to queue a class method with delayed job

Ok, so you have a project using Delayed Job but need to queue a class method. But oh no! You can't queue a class method because of either "ArgumentError: Cannot enqueue items which do not respond to perform" or "TypeError: can't dump anonymous class Class". What do you do now?

The simple and clean solution: use Resque [1] instead. It scales a lot better and doesn't put extra overhead on your database. Seriously consider for a moment that each delayed job worker is querying the database once every second...the same database that your application is probably using to load its models. Resque offsets that by using a fast keystore database separate from the other models (unless you're using redis models, but if you do that then ... haha?). But for those of you who can't use resque for one reason or another, here's a little piece of code that will give something similar.

[1] I don't like how resque is supposed to be pronounced like rescue, it should be pronounced like resk.
Kia Kroas :=: 17 Dec, 2010 02:14:02

This code can be used for example to queue your ActionMailer model's deliver_* methods. I know there are some hacks out there that try to make ActionMailer play nice with DelayedJob but they don't particularly seem like pleasing hacks. They overshoot too much by trying to get Delayed Job to work specifically with ActionMailer rather than doing the general solution that would work elsewhere.

Anyway, here it is:

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