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| book_reviewed = models.ForeignKey(Book, on_delete=models.CASCADE) | ||
| rating = models.IntegerField( | ||
| default=1, | ||
| validators=[MaxValueValidator(10), MinValueValidator(0)] |
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Good use of validators in Django.
| book_id = request.POST.get('bid') | ||
| rateing = float(request.POST.get('brate')) | ||
| list_book = Review.objects.filter(book_reviewed=Book.objects.get(id__exact=book_id)) | ||
| list_user_book = Review.objects.filter(Q(book_reviewed=Book.objects.get(id__exact=book_id)) & Q(reviewer=request.user)) |
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While this is not wrong but Q is not needed for such simple queries. You can write even very much complex queries without using Q.
| c.save() | ||
| b = Book.objects.get(id__exact=book_id) | ||
| previous_rating_of_book = b.rating | ||
| new_rating = ((previous_rating_of_book*len(list_book))-previous_rating_by_user+rateing)/len(list_book) |
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This is correct but a more Django-ish way for this would be using aggregate funtion in Django ORM:
Review.objects.filter(book__pk=book_id).aggregate(Avg('rating'))['rating__avg']
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