Django用空的ManyToManyField选择对象 [英] Django select objects with empty ManyToManyField

问题描述

考虑到以下模型，知道一个家庭，如何选择没有买家的孩子？

Considering the following models, knowing a family, how do I select Kids with no buyers?

class Family...

class Kid(models.Model):
    name = models.CharField(max_length=255)
    family = models.ForeignKey(Family)
    buyer = models.ManyToManyField(Buyer, blank=True, null=True)

family = get_object_or_404(Family, pk=1)
for_sale = family.kid_set.filter(buyer... this screws my child trade business

推荐答案

family.kid_set .filter（buyer__isnull = True）应该工作。

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