django-taggit深度关系查询

from django.db.models import Prefetch
from taggit.models import Tag

tags = Tag.objects.all().prefetch_related(
    Prefetch(
        'taggeditem_set',
        queryset=TaggedItem.objects.select_related('content_object'),
        to_attr='related_objects'
    )
)

for tag in tags:
    for related_object in tag.related_objects:
        # 处理关联对象
        pass

from django.db.models import Count, Prefetch
from taggit.models import Tag

tags = Tag.objects.annotate(
    num_related_objects=Count('taggeditem__content_object')
).filter(num_related_objects__gt=0).prefetch_related(
    Prefetch(
        'taggeditem_set',
        queryset=TaggedItem.objects.select_related('content_object'),
        to_attr='related_objects'
    )
)

for tag in tags:
    for related_object in tag.related_objects:
        # 处理关联对象
        pass