27 lines
847 B
Python
27 lines
847 B
Python
from typing import TypeVar
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from django.db.models import Avg
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from django.db.models.functions import Coalesce
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from django.db import models
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T = TypeVar('T')
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class PublicationQuerySet(models.QuerySet[T]):
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def with_score(self):
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qs = self
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qs = qs.annotate(average_score=Coalesce(Avg("ratings__score"), 0.0))
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return qs
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def only_publish(self):
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from .models import Publication
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qs = self
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return qs.filter(status=Publication.StatusVarioations.PUBLIC.value)
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class PublicationManager(models.Manager[T]):
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def get_queryset(self):
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return PublicationQuerySet[T](self.model, using=self._db).with_score()
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def with_related(self):
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return self.get_queryset().select_related('user', 'category')
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def only_publish(self):
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return self.get_queryset().only_publish() |