fix: model meta generator doesn't correctly identify relation names

packages/sdk/src/model-meta-generator.ts

@@ -206,7 +206,7 @@ function getBackLink(field: DataModelField) {
 }
 
 function getRelationName(field: DataModelField) {
-    const relAttr = field.attributes.find((attr) => attr.decl.ref?.name === 'relation');
+    const relAttr = field.attributes.find((attr) => attr.decl.ref?.name === '@relation');
     const relName = relAttr && relAttr.args?.[0] && getLiteral<string>(relAttr.args?.[0].value);
     return relName;
 }

tests/integration/tests/regression/issue-1241.test.ts

@@ -0,0 +1,88 @@
+import { loadSchema } from '@zenstackhq/testtools';
+import { randomBytes } from 'crypto';
+
+describe('issue 1241', () => {
+    it('regression', async () => {
+        const { enhance, prisma } = await loadSchema(
+            `
+            model User {
+                id String @id @default(uuid())
+                todos Todo[]
+
+                @@auth
+                @@allow('all', true)
+              }
+
+              model Todo {
+                id String @id @default(uuid())
+
+                user_id String
+                user User @relation(fields: [user_id], references: [id])
+
+                images File[] @relation("todo_images")
+                documents File[] @relation("todo_documents")
+
+                @@allow('all', true)
+              }
+
+              model File {
+                id String @id @default(uuid())
+                s3_key String @unique
+                label String
+
+                todo_image_id String?
+                todo_image Todo? @relation("todo_images", fields: [todo_image_id], references: [id])
+
+                todo_document_id String?
+                todo_document Todo? @relation("todo_documents", fields: [todo_document_id], references: [id])
+
+                @@allow('all', true)
+            }
+            `,
+            { logPrismaQuery: true }
+        );
+
+        const user = await prisma.user.create({
+            data: {},
+        });
+        await prisma.todo.create({
+            data: {
+                user_id: user.id,
+
+                images: {
+                    create: new Array(3).fill(null).map((_, i) => ({
+                        s3_key: randomBytes(8).toString('hex'),
+                        label: `img-label-${i + 1}`,
+                    })),
+                },
+
+                documents: {
+                    create: new Array(3).fill(null).map((_, i) => ({
+                        s3_key: randomBytes(8).toString('hex'),
+                        label: `doc-label-${i + 1}`,
+                    })),
+                },
+            },
+        });
+
+        const db = enhance();
+
+        const todo = await db.todo.findFirst({ where: {}, include: { documents: true } });
+        await expect(
+            db.todo.update({
+                where: { id: todo.id },
+                data: {
+                    documents: {
+                        update: todo.documents.map((doc: any) => {
+                            return {
+                                where: { s3_key: doc.s3_key },
+                                data: { label: 'updated' },
+                            };
+                        }),
+                    },
+                },
+                include: { documents: true },
+            })
+        ).toResolveTruthy();
+    });
+});