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,
)
What I want to do is,
symbol = StockSymbol.objects.first()
MyDailyPrice.objects.filter(content_object=symbol)
But it occured errors:
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
already has GenericRelation
. What's wrong with it?
Or do I have to override ojbect manager
?
You can filter with content_type
and object_id
, instead of content_object
.
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)
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