View model observing itself

[kastiglione]

In order to do validation, I'm creating an isValid signal property on the view model. The signal is created the usual way with -combineLatest:reduce: with the input signals being RACObserve(self, propertyNameX). It seems strange to be observing self, but it also seems to be a necessary approach. Is this the way to do it, or is there a better way?

EDIT: Related to #2.

[jspahrsummers]

We observe self all the time. I don't see any problem with it in theory or practice.

Why do you feel like it's strange?

[kastiglione]

Yeah, I figured it was just me. I say "strange" because I've always known observing as technique for external objects to employ. Observing self feels like speaking of oneself in the third person. It's not that I thought there would be problems. Thanks for confirming.

[jspahrsummers]

I think it's comparable to subscribing to a signal on self, since properties are signals under RAC.

[kastiglione]

That is a helpful perspective.