"on_delete=models.CASCADE" in OneToOne not work as ForeignKey relationship

[charettes]

@hoangpn

Therefore, I expect the order of deletion should be (Exporter, Farm) → Project, and I wonder if we have any simple solution to do that.

Well, did you read the reply above? It contains two solutions, one simple but brittle and a second one more advanced but with stronger guarantees. Not sure what else you are expecting here.