如果我正确，您可以使用django raw sql获取必要的数据：
q = """\
SELECT yourappname_category.id,
yourappname_category.name,
COUNT(outfit_id) > 0 as added
FROM yourappname_category
LEFT JOIN yourappname_category_outfits
ON yourappname_category.id = yourappname_category_outfits.category_id
AND yourappname_category_outfits.outfit_id=%s
WHERE yourappname_category.owner_id=%s
GROUP BY yourappname_category.id, yourappname_category.name"""
categories = Category.objects.raw(q, [obj.id, user.id])
results = [{'id': c.id, 'name': c.name, 'added': c.added} for c in categories]
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