如何在 Django ORM 中多次查询反向外键

Question

假设以下模型：

class Store(models.Model):
    name = models.CharField(max_length=255)


class Stock(models.Model):
    name = models.CharField(max_length=255)
    store = models.ForeignKey(Store, on_delete=models.PROTECT)


class Consignment(models.Model):
    cost = models.FloatField()


class Order(models.Model):
    quantity = models.IntegerField()
    stock = models.ForeignKey(Stock, on_delete=models.PROTECT)
    consignment = models.ForeignKey(Consignment, on_delete=models.PROTECT)

如何创建特定“商店”查询集的所有实例的所有“托运”的查询集，如下所示：

target_stores = Store.objects.filter(name__startswith="One")
consignments = target_stores.consignments.all()

Answer 1

您可以通过使用

__

分隔符跨越多个关系来进行反向查询：

Consignment.objects.filter(order__stock__store__name__startswith='One')