PUT, DELETE with JS Application (spine.js)

I'm coding a small api in node.js (express) for my spine.js application. Getting and creating new objects in the database is working pretty well. But on deleting/editing I've git a problem right now. Every object gets an individual id created by the JS app. In the database every entry has a unique key, too.

When I call object.destroy() I can see the ajax request which is sent to my server. But as parameter for the id I always have the id which was given by the app. But for deleting/updating stuff in the database I need the key which is stored in the database (mongoDB in my case) So how can I send the right id to the server or identify the right entry on the server side!?

Why not send the correct id back when creating your model like shown in the Spine documentation.

After a new Page record has been created, Spine sends a POST request to /pages containing the following:

  POST /pages HTTP/1.1 Host: spine-rails3.herokuapp.com Accept:
  application/json, text/javascript, */*; q=0.01 Content-Type:
  application/json; charset=UTF-8 X-Requested-With: XMLHttpRequest
  Content-Length: 65

  {"name":"Dummy page","id":"EEAF4B17-5F1D-4C06-B535-D9B58D84142F"}

Then the server should respond with something like this:

 HTTP/1.1 201 Created Content-Type: application/json; charset=utf-8
 Location: http://spine-rails3.herokuapp.com/pages/196 Content-Length:
 28 Connection: keep-alive

 {"name":"Dummy page","id":1}