Question

symbol.py

class Symbol(BaseModel):
    name = models.CharField(max_length=30,)

    class Meta:
        abstract = True

class StockSymbol(Symbol):
    market = models.CharField(max_length=10,)
    my_daily_price = GenericRelation(MyDailyPrice)

daily_price.py

class DailyPrice(BaseModel):
    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey('content_type', 'object_id')

    class Meta:
        abstract = True

class MyDailyPrice(DailyPrice):
    open = models.DecimalField(
        max_digits=15,
        decimal_places=2,
    )

我想做的是，

symbol = StockSymbol.objects.first()
MyDailyPrice.objects.filter(content_object=symbol)

但它出现了错误：

FieldError: Field 'content_object' does not generate an automatic reverse relation and therefore cannot be used for reverse querying. If it is a GenericForeignKey, consider adding a GenericRelation.

StockSymbol已有GenericRelation。它有什么问题？

或者我是否必须覆盖ojbect manager？

Answer 1

您可以使用content_type和object_id代替content_object进行过滤。

from django.contrib.admin.options import get_content_type_for_model
symbol = StockSymbol.objects.first()
MyDailyPrice.objects.filter(content_type=get_content_type_for_model(symbol), object_id=symbol.pk)

Django：我可以使用objects.filter（）作为通用外键吗？

1 个答案: