public List<String> getIdsToDownload() throws IOException, JSONException, HttpException {
   // Default value is currently epoch
   long lastUpdateMillis =
       context.getSharedPreferences().getLong(RapidFtrApplication.LAST_CHILD_SYNC, 0);
   DateTime lastUpdate = new DateTime(lastUpdateMillis);
   return childEntityHttpDao.getUpdatedResourceUrls(lastUpdate);
 }
 @Override
 public Child getRecord(String resourceUrl) throws IOException, JSONException, HttpException {
   Child child = childEntityHttpDao.get(resourceUrl);
   GenericSyncService.setAttributes(child);
   return child;
 }