Referential actions not (all) working when `referentialIntegrity` set to `prisma`

Bug description

Hi & thanks for the awesome work in Prisma,

Looks like when setting referentialIntegrity to prisma, referential actions have some problems:

• they stopped working altogether in Prisma v3.5.0

In v3.4.2:

• they default to NoAction instead of Restrict (as it is supposed to as I understand the docs)
• they don’t work with composite id/unique constraints
• SetNull doesn’t work as noticed in #9483

Cheers!

How to reproduce

1. Create the DB with Prisma Migrate using the provided Prisma schema (cf below)
2. Create a user with related posts
3. Delete the user and check the foreign key on the posts that were related to the deleted user

Expected behavior

No response

Prisma information

generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["referentialIntegrity"]
}

datasource db {
  provider          = "mysql"
  url               = env("DATABASE_URL")
  shadowDatabaseUrl = env("SHADOW_DATABASE_URL")
  referentialIntegrity = "prisma"
}

model User {
  id    Int     @id @default(autoincrement())
  posts Post[]
}

model Post {
  id        Int     @id @default(autoincrement())
  author    User   @relation(fields: [authorId], references: [id], onDelete: Cascade) # <- edit accordingly
  authorId  Int
}

Environment & setup

• OS: Mac OS
• Database: Planetscale
• Node.js version: v16.13.0

Prisma Version

Latest roughly working version is 3.4.2 as below (3.5.0 ignores completely referential actions)

prisma                  : 3.4.2
@prisma/client          : 3.4.2
Current platform        : darwin
Query Engine (Node-API) : libquery-engine 57771c0558568c7d08bd34c7248af5244ae16bd9 (at node_modules/@prisma/engines/libquery_engine-darwin.dylib.node)
Migration Engine        : migration-engine-cli 57771c0558568c7d08bd34c7248af5244ae16bd9 (at node_modules/@prisma/engines/migration-engine-darwin)
Introspection Engine    : introspection-core 57771c0558568c7d08bd34c7248af5244ae16bd9 (at node_modules/@prisma/engines/introspection-engine-darwin)
Format Binary           : prisma-fmt 57771c0558568c7d08bd34c7248af5244ae16bd9 (at node_modules/@prisma/engines/prisma-fmt-darwin)
Default Engines Hash    : 57771c0558568c7d08bd34c7248af5244ae16bd9
Studio                  : 0.438.0
Preview Features        : referentialIntegrity

[pimeys]

I will do a git bisect tonight to see why we had the regression and when exactly it was fixed.

[guillaumervls]

Looks like these problems are all gone in 3.6.0 indeed ! But I would double check if I were you, I checked quickly 😄