我在将GenericRelation
与update_or_create
一起使用时遇到问题。
我有以下型号:
class LockCode(TimeStampedModel):
context_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
context_id = models.PositiveIntegerField()
context = GenericForeignKey('context_type', 'context_id')
class Mission(DirtyFieldsMixin, models.Model):
lock_codes = GenericRelation(
LockCode,
content_type_field='context_type',
object_id_field='context_id',
related_query_name='mission'
)
我尝试使用任务作为键来创建或更新
LockCode
:mission = ....
LockCode.objects.update_or_create(
context=mission,
defaults={
#some other columns there
}
我有
FieldError: Field 'context' does not generate an automatic reverse relation and therefore cannot be used for reverse querying. If it is a GenericForeignKey, consider adding a GenericRelation.
当我显式使用context_id和context_type时,它起作用:
LockCode.objects.update_or_create(
context_id=mission.pk,
context_type=ContentType.objects.get_for_model(Mission),
defaults={
#some other columns there
}
我的配置有问题吗?还是将
GenericForeignKey
用于update_or_create的唯一方法? 最佳答案
找到了解决方案。只需要使用mission
而不是context
进入update_or_create:
mission = ....
LockCode.objects.update_or_create(
mission=mission,
defaults={
#some other columns there
}
关于python - 用于update_or_create的Django GenericRelation,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/56855817/