public static void deleteAllImagesFormDb() {
    List<MImages> imageList = new ArrayList<MImages>();
    imageList = MImages.all();

    for (int i = 0; i < imageList.size(); i++) {
      MImages.delete(imageList.get(i).id);
    } // for
  } // deleteAllImagesFormDb;
  public static void updateLikesInDbLocal(String imageId, String displayId) {
    Logger.info("  --update local likes in db for image: " + imageId);
    List<MImages> images = new ArrayList<MImages>();
    images = MImages.all();

    // find the right image based on imageId
    for (int i = 0; i < images.size(); i++) {
      MImages image = images.get(i);
      if (image.idInstagram.equals(imageId)) {
        Logger.info(
            "    i= " + i + " imageId: " + image.idInstagram + " author: " + image.authorName);
        // update likes in db (local likes +1)
        // TODO find a way to update the filed, not to delete and add the same image
        image.updateNumberOfLikesLocal();
        MImages.delete(image.id);
        MImages.addNew(
            new MImages(
                image.idInstagram,
                image.url,
                "instagram",
                image.authorName,
                image.authorPic,
                image.timeCreated,
                image.numberOfLikesIns,
                image.numberOfLikesLocall));
      } // if
    } // for

    // send the like update to all clients except the source
    sendLikeUpdateToClients(imageId, displayId);

    // update the hot images
    updateHotImages();

    Logger.info("-----------------------------");
  } // updateLikesInDbLocal