// Grab all users
  q = SC.Query.create({recordType:Listenapp.User});
  var users = Listenapp.alonetone.findAll(q);

  // Ok, now only get users starting with S
  q.set('conditions':'name STARTS_WITH "A"); //does not work actually, get syntax error

  // If I hack the data_source
  if(SC.instanceOf(fetchKey, SC.Query) && fetchKey.conditions === undefined) return [];

  // and do the following

   q= SC.Query.create({recordType: Listenapp.User, 'conditions':'name BEGINS_WITH "A"'});
   var users = Listenapp.alonetone.findAll(q);

  // then i get the result i'm looking for