[Firestore Mixin] Collection (using live:true) not updating variable in realtime when new document added

[derhuebiii]

Description

Using the Firestore Mixin I do not get collection realtime updates (using live:true) when a new document is added to a collection. If I change data within an existing document this is reflected, so realtime updates work there.
I also checked with an observer, same behaviour.

Expected outcome

Update of data variable if document is added/deleted.

Actual outcome

Data is not reflected as realtime update.

Live Demo

Steps to reproduce

Browsers Affected

• Chrome
• Firefox
• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10

[derhuebiii]

@mbleigh @merlinnot any ideas/comments? Thanks!

[merlinnot]

It might be a problem with notifying Polymer of changes in an array. Can you verify that the changes are actually there after adding a document by looking at the value in a debugger or even logging it in a console (manually, from developer tools).