Sometimes you want to check if something's loaded before you hit the db.

There are a number of reasons this might happen: you have a test, it runs fine individually, but when you run rake test or rake test:units, it fails. This might be because one test is writing to the db and those changes aren't getting rolled back.

I know named scopes are getting all changed around in Rails 3, but I figured this out a while ago, and then forgot it, came here to find my answer, and realized I never wrote it down. The problem is that when you're building complex chained scopes its often...

Well, I think I've already looked this up and forgotten it twice.

I wanted to view a log of all the lines I'd written in an IRB session, but didn't see a simple equivalent of bash's "history" command.