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| class RatingSystem(models.Model): | ||
| book = models.ForeignKey(Book, on_delete=models.CASCADE) | ||
| rated_by = models.ForeignKey(User, on_delete=models.CASCADE) | ||
| rating = models.SmallIntegerField(default=None) |
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You can also use MinValueValidator, MaxValueValidator for this as validators at database level.
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| for ratings_multi in RatingSystem.objects.filter(book=book): | ||
| totalrating += ratings_multi.rating | ||
| book.rating = totalrating/RatingSystem.objects.filter(book=book).count() |
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While this is correct a more clean and Django-ish way for doing this could be:
RatingSystem.objects.filter(book__pk=book_id).aggregate(Avg('rating'))['rating__avg']
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