Longevity Release 0.23 - Use Type Classes to Improve Type Safety of Persistent API

This longevity release has been a long time in the making. The main improvement here, and the one that has taken by far the most effort, is instituting the use of type classes to provide type safety for the persistence API. I've done a technical writeup on this work in my previous blog post. It's actually pretty interesting because I've never seen type classes quite this way before, so I think it's worth the read. The TLDR is that the repository API is now fully type safe, and the last instance of forcing users to inherit from a longevity trait has been removed.

Here are some of the other major improvements in this release:

Scripting with Scala and SBT

I wanted to write about a great experience I had with Scala and SBT today. This morning I had to write a script to convert one .csv file into another. I figured, there's no way I'm not doing this in Scala. So I sat down to write my little script. I opened up script.scala in my current directory, and started typing:

object script extends App {
  println("hi")
}