Problem when delete with cascade

I have two models

model Sale {
  id            String    @id @default(cuid())
  cart          Item[]
}

model Item {
  id                    String  @id @default(cuid())
  name              String
  sale                Sale     @relation(fields: [saleId], references: [id])
  saleId             String
}

Looking at show create table item on Mysql, I do have

  CONSTRAINT `item_ibfk_2` FOREIGN KEY (`saleId`) REFERENCES `Sale` (`id`) ON DELETE CASCADE ON UPDATE CASCADE

If I do delete from sale where id='some id' it deletes the sale and the items as expected.

But, when I do the same in Prisma prisma.sale.delete({ where: { id: 'some id' } }) I got the error bellow

Invalid `prisma.sale.delete()` invocation in webpack-internal:///./graphql/customs/MutationSale.js:459:38 The change you are trying to make would violate the required relation 'SaleToItem' between the `Sale` and `Item` models.

Am I doing something wrong?

Environment & setup

• OS: Mac OS
• Database: MySQL 5.7
• Node.js version: 14.9.0
• Prisma version: 2.9.0

[P4sca1]

@heybenchen Yes, this is actually a bug, so it does not work like explained in the docs. See https://github.com/prisma/prisma/issues/2057 for more info.

[ryands17]

@heybenchen if your foreign key is nullable, then cascade deletes will work fine. It just doesn’t work in the issue that @P4sca1 has described above. As per the tutorial, the foreign key is nullable on the Post model so cascade deletes should work.