Keeping a document list up to date with Observable using Firestore and NativeScript 8

[carlosdelfino]

Thanks for this plugin, but I'm learning to program with Nativescript 8 and Firebase/Firestore with Angular, all in the current version and I'm having a lot of doubts about the use of Observable, I'm native to CRUD applications with other languages like Java.

Could someone help me with an example to keep a list of documents up to date on the screen using Observables (RxJS), Firestore and Nativescript 8?

Grateful.