Jonathan's code (above) made sense to me. But I couldn't really figure out what was going on in the original article's case statement. 🙁 It makes sense conceptually, but the specifics of the code were too funky for me to parse. Partly this is because I'm new to this stuff, but also partly because the Jonathan's code is so much more nicely formatted and easy to reconcile. I'd humbly request that the article author reformat his code so it's more readable.

And also, please note that as of the time of this posting, the incorrect column name ("todoGroup") is still specified in the original article.