django genericforeignkey null

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1class MyModel(models.Model):
2    ...other fields...
3    content_type = models.ForeignKey(ContentType, blank=True, null=True, on_delete=models.SET_NULL)
4    object_id = models.PositiveIntegerField(blank=True, null=True)
5    content_object = generic.GenericForeignKey('content_type', 'object_id')

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