entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID')
entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id')
key = models.CharField(max_length=255)
entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID')
entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id')
key = models.CharField(max_length=255)