https://github.com/hrueger/prisma-24540

https://github.com/hrueger/prisma-24540

Last synced: 13 days ago
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• Host: GitHub
• URL: https://github.com/hrueger/prisma-24540
• Owner: hrueger
• Created: 2024-06-14T19:45:02.000Z (8 months ago)
• Default Branch: main
• Last Pushed: 2024-06-14T20:38:48.000Z (8 months ago)
• Last Synced: 2024-06-14T21:48:08.175Z (8 months ago)
• Size: 18.6 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Prisma/D1 Bug: IDs of optional relations are lost quietly during migration (prisma/prisma#24540)

## Setup

- `npm i`

- `npx wrangler d1 migrations apply prisma-demo-db --local`

- View the `.sqlite` file in `.wrangler/state/v3/minflare-D1DatabaseObject`. You can see that there is one row in the `User` and one row in the `Post` table. As expected, the `Post` has a `authorId` of `1`.

- Now uncomment the line in the `schema.prisma` file

- `npx prisma migrate diff --from-local-d1 --to-schema-datamodel ./prisma/schema.prisma --script --output prisma/migrations/0003_modify-table.sql`

- `npx wrangler d1 migrations apply prisma-demo-db --local`

- See how the `authorId` is now `NULL` :-(

## Possible fix

Copy the id pairs to temporary tables and then copy them back after the migration. Example migration file to test:

```sql

-- RedefineTables

PRAGMA defer_foreign_keys=ON;

PRAGMA foreign_keys=OFF;

-- Since D1 currently looses ids when the table is connected, copy the id / authorId pairs from Post to a temporary table (only if authorId is not null)

CREATE TABLE "__temp_post_authorId" (

    "id" TEXT NOT NULL,

    "authorId" INTEGER NOT NULL

);

INSERT INTO "__temp_post_authorId" ("id", "authorId") SELECT "id", "authorId" FROM "Post" WHERE "authorId" IS NOT NULL;

CREATE TABLE "new_User" (

    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,

    "email" TEXT NOT NULL,

    "name" TEXT NOT NULL DEFAULT 'Anonymous'

);

INSERT INTO "new_User" ("email", "id") SELECT "email", "id" FROM "User";

DROP TABLE "User";

ALTER TABLE "new_User" RENAME TO "User";

CREATE UNIQUE INDEX "User_email_key" ON "User"("email");

-- Copy the data from the temporary table back to Post

UPDATE "Post" SET "authorId" = (SELECT "authorId" FROM "__temp_post_authorId" WHERE "__temp_post_authorId"."id" = "Post"."id") WHERE "id" IN (SELECT "id" FROM "__temp_post_authorId");

DROP TABLE "__temp_post_authorId";

PRAGMA foreign_keys=ON;

PRAGMA defer_foreign_keys=OFF;

```