Django ORM联接查询

我有两个模型

class ShipmentBagSealMapping(models.Model):
    bag_seal = models.CharField(max_length = 255)
    status = models.CharField(max_length = 255, default = 'open')
    time = models.DateTimeField( auto_now_add = True, db_index = True)
    shipment_id = models.ForeignKey('Shipment', related_name = 'bags')



class Shipment(models.Model):
    job_id = models.CharField(max_length = 255)
    time = models.DateTimeField( auto_now_add = True, db_index = True)

我想写一个JOIN查询，告诉我

ShipmentBagSealMapping

中

status=close

的记录计数，

shipping

的时间在

[开始时间和结束时间]

范围内

以下是我所尝试的：

total_bags = ShipmentBagSealMapping.objects.filter(shipments__time__range = [start_time,end_time],status='close').values('bag_seal').distinct().count()

但它抛出了一个错误，即：-

Cannot resolve keyword 'shipments' into field. Choices are: bag_seal, id, shipment_id, status, time

我该怎么做？

这应该可以做到：

total_bags = ShipmentBagSealMapping.objects.filter(shipment_id__time__range = [start_time,end_time],status='close').values('bag_seal').distinct().count()

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请注意，您已将该字段定义为

shipping\u id

而非

shippings

Django将自动在您的外键中添加_id，因此进行一些类似的更改可能会有所帮助

class ShipmentBagSealMapping(model.Model):
bag_seal = models.CharField(max_length = 255)
status = models.CharField(max_length = 255 )
time = models.DateTimeField( auto_now_add = True)
shipments = models.ForeignKey('Shipment', related_name = 'bags')

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哦，是的……非常感谢。：）请你也看看这个问题好吗。谢谢