Add updated? and created? methods on SaveOperations

[davidepaolotua]

Implements #888.
Adds two new boolean methods to SaveOperation.
They work similarly to new_record? but always return false if the record was not persisted (e.g: failed save or not-yet-performed operation)

[jwoertink]

This is great! Thanks for doing this. I think the only part missing for it to complete #888 is that it needs to work on upsert as well. That was actually the one bit I really needed for this. But if you don't have time to add that, I'm willing to accept this as a partial implementation. I think it's already super useful.

[davidepaolotua]

I'm probably drunk or missing the point but... Doesn't it work for upsert as well? Have a look at the changed tests, but I'm pretty sure I added a check in there (iirc, it was a free-to-have in defining these two methods)

[jwoertink]

Nope, I'm the drunk one! I totally missed that your specs cover upsert already 🎉 Thanks for pointing that out.