Adding a model to a firebase collection changes its cid

[jlowhy]

When I add a model to a firebase collection, the initial cid value of the model is changed. Is this intended?

This happens when the model object is passed through SyncCollection._parseModels.
_parseModels will return an object that is stripped of everything other than its attributes.

As a result, when the new model is saved and added into the collection, a new cid will be assigned to it.

This behaviour was problematic to me as I assumed that based on backbone.js convention, the cid value will not change upon creation.

[davideast]

Can you provide an example? I'd like to step through the process myself.

[jlowhy]

Hi David, here's a fiddle for it:
http://jsfiddle.net/8cnu309p/2/

I should add that this happens if the model already has a defined id.