Getting a list of field values ​​for a GenericForeignKey relationship?

Question

Django

There is a model associated with another via GenericForeignKey
models.py

class Report(models.Model):
    ....
    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
    usage_id = models.PositiveIntegerField(verbose_name='ID', db_column='id')
    usage = GenericForeignKey('content_type', 'usage_id')
    ....

Does djanga have a way/shortcut to get a list of usage field values ​​similar to

Models. objects.all().values_list('usage', flat=True)

only working with GenericForeignKey ?

Answer 1

`usage` is not a field, but a key
, I think that's how it should be
Report.objects.all().prefetch_related('usage')