Rails makes such a nice change from coding in .NET. I mean, I do like .NET and C#, but sometimes its very bloated and can be quite cumbersome to do things. Rails, on the other hand, isn't big. Or cumbersome. In fact, its downright lean and to-the-point, unlike my blog posts (what there are of them!). Anyway, today we're talking category trees, surely one of the most exciting concepts that there is to talk about. One thing that made me smile recently was the need to list all the categories that a...