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

[derhuebiii]

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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).