I think the issue was by ths following , You can make a custom filter with an id parameter. That filter will take the item, verify if it has the good id, and the verify if it's active or not. My original example was in this Plunker http://plnkr.co/edit/FSwzndyjRxJIymehsZIg?p=preview
Is there another way to observe for changes to a sub property of an object in Google Polymer 1.0?
By : mgymrek
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I had what I think is a similar problem when trying to be notified of changes to an array in a computed property. In my case I wanted to know when it's children were modified so that I could recompute something else with the changed children. Here's a snippet of working code from a polymer element: