test(client): wrong error for multiple queries in tx #15433

packages/client/src/runtime/DataLoader.ts

@@ -70,12 +70,14 @@ export class DataLoader<T = unknown> {
           .then((results) => {
             if (results instanceof Error) {
               for (let i = 0; i < batch.length; i++) {
-                batch[i].reject(results)
+                console.log('HMMM')
+                batch[i].reject(results[i])
               }
             } else {
               for (let i = 0; i < batch.length; i++) {
                 const value = results[i]
                 if (value instanceof Error) {
+                  console.log('LEL')
                   batch[i].reject(value)
                 } else {
                   batch[i].resolve(value)
@@ -84,6 +86,7 @@ export class DataLoader<T = unknown> {
             }
           })
           .catch((e) => {
+            console.log('LOLOL')
             for (let i = 0; i < batch.length; i++) {
               batch[i].reject(e)
             }

packages/client/tests/functional/issues/15433-wrong-error-query-tx/_matrix.ts

@@ -0,0 +1,9 @@
+import { defineMatrix } from '../../_utils/defineMatrix'
+
+export default defineMatrix(() => [
+  [
+    {
+      provider: 'sqlite',
+    },
+  ],
+])

packages/client/tests/functional/issues/15433-wrong-error-query-tx/prisma/_schema.ts

@@ -0,0 +1,20 @@
+import { idForProvider } from '../../../_utils/idForProvider'
+import testMatrix from '../_matrix'
+
+export default testMatrix.setupSchema(({ provider }) => {
+  return /* Prisma */ `
+  generator client {
+    provider = "prisma-client-js"
+  }
+  
+  datasource db {
+    provider = "${provider}"
+    url      = env("DATABASE_URI_${provider}")
+  }
+  
+  model User {
+    id ${idForProvider(provider)}
+    email String @unique
+  }
+  `
+})

packages/client/tests/functional/issues/15433-wrong-error-query-tx/tests.ts

@@ -0,0 +1,24 @@
+import testMatrix from './_matrix'
+// @ts-ignore
+import type { PrismaClient } from './node_modules/@prisma/client'
+
+declare let prisma: PrismaClient
+
+testMatrix.setupTestSuite(
+  (suiteConfig, suiteMeta) => {
+    test('example', async () => {
+      await prisma.$transaction([
+        prisma.user.create({ data: { email: 'john1@doe.io' } }),
+        prisma.user.create({ data: { email: 'john2@doe.io' } }),
+        prisma.user.create({ data: { email: 'john3@doe.io' } }),
+        prisma.user.create({ data: { email: 'john1@doe.io' } }),
+      ])
+    })
+  },
+  {
+    optOut: {
+      from: ['postgresql', 'mysql', 'mongodb', 'cockroachdb', 'sqlserver'],
+      reason: 'this is something that is handled by the client',
+    },
+  },
+)