title: Sending extra, non-model data in a save request with backbone.js?
body: <p>I'm looking for a solution for dealing with an issue of state between models using backbone.js.</p>
  
  <p>I have a time tracking app where a user can start/stops jobs and it will record the time the job was worked on. I have a job model which holds the job's data and whether it is currently 'on'.</p>
  
  <p>Only 1 job can be worked on at a time. So if a user starts a job the currently running job must be stopped. I'm wondering what the best solution to do this is. I mean I could simply toggle each job's 'on' parameter accordingly and then call save on each but that results in 2 requests to the server each with a complete representation of each job.</p>
  
  <p>Ideally it would be great if I could piggyback additional data in the save request similarly to how it's possible to send extra data in a fetch request. I only need to send the id of the currently running job and since this really is unrelated to the model it needs to be sent <em>alongside</em> the model, not part of it.</p>
  
  <p>Is there a good way to do this? I guess I could find a way to maintain a reference to the current job server side if need be :\</p>