def update_ratings(item_id):
# itemiin liittyvät muuttujat
item = Item.get_by_id(item_id=item_id)
ratings = Rating.get_by_item(item_id=item_id)
i_rating = 0.0
r = 0
# useriin liittyvät muuttujat
user = User.get_by_id(id=item.user_id)
user_items = Item.get_all_by_user(user_id=item.user_id)
u_rating = 0.0
ru = 0
# lasketaan itemin ratingien keskiarvo
for rating in ratings:
r = r + 1
i_rating = i_rating + rating.__dict__["rating"]
i_rating_dict = {"rating": i_rating / r}
item.rating = i_rating_dict.get("rating")
# lasketaan userin kaikkien itemien ratingien keskiarvo
for rating in user_items:
if rating.__dict__["rating"] is None:
continue
ru = ru + 1
u_rating = u_rating + rating.__dict__["rating"]
u_rating_dict = {"rating": u_rating / ru}
user.rating = u_rating_dict.get("rating")
# tallennetaan muutokset
item.save()
user.save()
def get(self, item_id):
item = Item.get_by_id(item_id=item_id)
if item is None:
return item_not_found()
ratings = Rating.get_by_item(item_id=item.id)
return rating_list_schema.dump(ratings).data, HTTPStatus.OK
