title: Serializing outgoing data with Ember.js and Ember-Data
body: <p>I'm using Ember.js 1.0.0 and Ember-Data-beta2.</p>
  
  <p>I have a model <code>Product</code> which belongsTo <code>Company</code>. When creating a product, the user can select which company it belongsTo in a dropdown menu. This adds <code>"company":"25"</code> to the form post, which for the most part is just what I want. Instead of <code>"company"</code>, however, I want the form to submit <code>"company_id"</code>. How can I change this?</p>
  
  <p>From what I can tell, Ember-Data serializers only normalize incoming data, not outgoing data. Would this be handled in the adapter? If so, how do I communicate this convention to Ember?</p>