2022-01-18 20:02:38 +00:00
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""" template filters """
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from django import template
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from django.db.models import Avg
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from bookwyrm import models
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from bookwyrm.utils import cache
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register = template.Library()
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@register.filter(name="rating")
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def get_rating(book, user):
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"""get the overall rating of a book"""
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return cache.get_or_set(
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2022-05-30 15:42:48 +00:00
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f"book-rating-{book.parent_work.id}",
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lambda u, b: models.Review.objects.filter(
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book__parent_work__editions=b, rating__gt=0
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).aggregate(Avg("rating"))["rating__avg"]
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2022-01-18 20:02:38 +00:00
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or 0,
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user,
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book,
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timeout=15552000,
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)
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@register.filter(name="user_rating")
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def get_user_rating(book, user):
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"""get a user's rating of a book"""
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rating = (
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models.Review.objects.filter(
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user=user,
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book=book,
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rating__isnull=False,
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deleted=False,
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)
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.order_by("-published_date")
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.first()
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)
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if rating:
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return rating.rating
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return 0
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