DS.JSONSerializer#serializeAttribute()

serializeAttribute can be used to customize how DS.attr properties are serialized

For example if you wanted to ensure all your attributes were always serialized as properties on an attributes object you could write:

import DS from 'ember-data';

export default DS.JSONSerializer.extend({
  serializeAttribute: function(snapshot, json, key, attributes) {
    json.attributes = json.attributes || {};
    this._super(snapshot, json.attributes, key, attributes);
  }
});