Johnny Cache & Management Commands

Discovered a pretty huge caveat to using Johnny Cache to speed up Django ORM queries.

Johnny Cache is a really great library that can speed up Django sites that are slowing down with large joins and complex data models. Django has a built in ORM caching mechanism, but Johnny Cache takes it one step further.

That said, there are some monsters in the undiscovered ocean. One of the big ones is, I feel, not prominent enough: enabling cache validation and invaldiation when running mangaement commands.

You must enable Johnny Cache some where in your project that gets run everytime is used. The top level file is a good candidate in most projects. If you don’t do that, management commands will leave your views all screwed up and you’ll wonder why things that should be published are not.

I learned the hard way.