save: function(){
  var url = "/api/v1/player_evaluations";
  var recordType = "player_evaluation";
  var topLevelKey = `${recordType}s`;
  var itemsToSave = this.get('myItems');

  var store = this.get('store');
  var type = "post";
  var dataType = "json";
  var contentType = "application/json; charset=utf-8";

  var recordCollection = Ember.A();
  for(var i = 0; i < itemsToSave.length; i++) {
    recordCollection.push store.createRecord(recordType, itemsToSave[i]);
  }

  var paylaod = {}
  var paylaod[topLevelKey] = recordCollection.map(function(record) { record.serialize() });
  var data = JSON.stringify(payload);
  Ember.$.ajax({ url, type, dataType, data, contentType }).then function(data) {  store.pushPayload recordType, data }
}