public Rating addRatings(HashMap<String, Object> rat) {
		@SuppressWarnings("unchecked")
		HashMap<String, String> holder = (HashMap<String, String>)rat.get("rating");
		if(holder.containsKey("authorsId")) this.authorsId = holder.get("authorsId");
		if(holder.containsKey("comment")) this.comment = holder.get("comment");
		if(holder.containsKey("date")) this.date = Date.valueOf(holder.get("date"));
		if(holder.containsKey("stars")) this.stars = Integer.parseInt(holder.get("stars"));

		
		return this;
	}