Django 如何使用“选择相关对象”访问相关对象

我有3种型号，如下所述-

订单

class Orders(BaseModel):

    created_by = models.ForeignKey(User, on_delete=models.PROTECT, null=False, blank=False)
    property = models.ForeignKey(Properties, on_delete=models.PROTECT, null=False, blank=False)
    ....
    ....

class Properties(BaseModel):

    property_long_name = models.CharField(max_length=255, blank=False)
    property_trading_name = models.CharField(unique=True, max_length=255, blank=False)
    ....
    ....

class PropertyOwners(BaseModel):

    property = models.ForeignKey(Properties, related_name='property_owners', on_delete=models.PROTECT, blank=False, null=False)
    owner = models.ForeignKey(User, on_delete=models.PROTECT, blank=False, null=False)
    ....
    ....

属性

class Orders(BaseModel):

    created_by = models.ForeignKey(User, on_delete=models.PROTECT, null=False, blank=False)
    property = models.ForeignKey(Properties, on_delete=models.PROTECT, null=False, blank=False)
    ....
    ....

class Properties(BaseModel):

    property_long_name = models.CharField(max_length=255, blank=False)
    property_trading_name = models.CharField(unique=True, max_length=255, blank=False)
    ....
    ....

class PropertyOwners(BaseModel):

    property = models.ForeignKey(Properties, related_name='property_owners', on_delete=models.PROTECT, blank=False, null=False)
    owner = models.ForeignKey(User, on_delete=models.PROTECT, blank=False, null=False)
    ....
    ....

业主

class Orders(BaseModel):

    created_by = models.ForeignKey(User, on_delete=models.PROTECT, null=False, blank=False)
    property = models.ForeignKey(Properties, on_delete=models.PROTECT, null=False, blank=False)
    ....
    ....

class Properties(BaseModel):

    property_long_name = models.CharField(max_length=255, blank=False)
    property_trading_name = models.CharField(unique=True, max_length=255, blank=False)
    ....
    ....

class PropertyOwners(BaseModel):

    property = models.ForeignKey(Properties, related_name='property_owners', on_delete=models.PROTECT, blank=False, null=False)
    owner = models.ForeignKey(User, on_delete=models.PROTECT, blank=False, null=False)
    ....
    ....

我试图查询

订单

，并希望锁定它将返回的行。我还想锁定

Properties

model的相关行。此外，这些属性将有一个或多个所有者，这些所有者存储在模型

PropertyOwners

中。我想锁定与该订单的属性相关的

ProprertyOwners

行

到目前为止，我试图这样做，但它没有工作，并返回我一个错误-

Queryset

Orders.objects.select_related('property__property_owners').select_for_update().exclude(created_by=created_by).values('id', 'property', 'units', 'created_by', 'sell_price_per_unit', 'order_status').filter(property=order_obj.property, order_type__name=SELL, order_status__in=[PARTIALLY_COMPLETED[1], OPEN[1]], sell_price_per_unit__lte=order_price).order_by('sell_price_per_unit')

错误-

django.core.exceptions.FieldError: Invalid field name(s) given in select_related: 'property_owners'. Choices are: property_type, created_by, approved_by, property_manager

---

queryset返回的所有订单将只属于一个属性。一个物业可能有一个或多个业主。

我认为

选择相关的
不适用于一对多关系。即使是这样，您也应该使用
属性\u所有者\u集
。我没有测试过这个，但尝试了
。prefetch\u related（'property\uu property\u owners\u set'）
。@Selcuk，我尝试过这个，但不起作用。