Problem when passing a singleton to another viewmodel using self.VM.Navigate

Question

In the public part of my app the user starts with a link to a VM (IndexBookingPage) with DVM params. An action looks up the publicbookingpage object from Id, and if found navigate to Eventlist. This part works. But in the Eventlist self is null. Why? IndexBookingPage

EventList

Answer 1

Don't set self inside a viewmodel.

Instead, use OneSession.oclSingleton by itself. Use a let statement if you think it's too bulky in text to repeat OneSession.oclSingleton.

Why do you have "Requires root" on the IndexBookingPage at all?

Answer 2

I have change to OneSession.oclSingleton instead, and now it works. Is there a rule when to use self or Class.oclSingleton?

I just tried different solutions, thats why I checked required root.