fix(delegate): update with "connect" is not properly rejected for polymorphic models

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

@@ -298,7 +298,8 @@ function getBackLink(field: DataModelField) {
 
     const relName = getRelationName(field);
 
-    const sourceModel = field.$container as DataModel;
+    // in case of polymorphism, the source model is the base delegate model
+    const sourceModel = field.$inheritedFrom ?? (field.$container as DataModel);
     const targetModel = field.type.reference.ref as DataModel;
 
     for (const otherField of targetModel.fields) {

tests/integration/tests/enhancements/with-delegate/policy-interaction.test.ts

@@ -208,4 +208,64 @@ describe('Polymorphic Policy Test', () => {
         await expect(db.asset.findUnique({ where: { id: vid1.id } })).toResolveNull();
         await expect(db.asset.findUnique({ where: { id: vid2.id } })).toResolveTruthy();
     });
+
+    it('interaction with connect', async () => {
+        const schema = `
+        model User {
+            id Int @id @default(autoincrement())
+        }
+
+        model Asset {
+            id Int @id @default(autoincrement())
+            assetType String
+            comments Comment[]
+
+            @@delegate(assetType)
+            @@allow('all', true)
+        }
+
+        model Post extends Asset {
+            title String
+            postType String
+            @@delegate(postType)
+        }
+
+        model RatedPost extends Post {
+            rating Int
+        }
+
+        model Comment {
+            id Int @id @default(autoincrement())
+            content String
+            asset Asset? @relation(fields: [assetId], references: [id])
+            assetId Int?
+            @@allow('read,create', true)
+            @@allow('update', auth().id == 1)
+        }
+        `;
+
+        const { enhance } = await loadSchema(schema);
+        const db = enhance();
+
+        const comment1 = await db.comment.create({
+            data: { content: 'Comment1' },
+        });
+
+        await expect(
+            db.ratedPost.create({ data: { title: 'Post1', rating: 5, comments: { connect: { id: comment1.id } } } })
+        ).toBeRejectedByPolicy();
+
+        const post1 = await db.ratedPost.create({ data: { title: 'Post1', rating: 5 } });
+        await expect(
+            db.post.update({ where: { id: post1.id }, data: { comments: { connect: { id: comment1.id } } } })
+        ).toBeRejectedByPolicy();
+        await expect(
+            db.ratedPost.update({ where: { id: post1.id }, data: { comments: { connect: { id: comment1.id } } } })
+        ).toBeRejectedByPolicy();
+
+        const user1Db = enhance({ id: 1 });
+        await expect(
+            user1Db.ratedPost.update({ where: { id: post1.id }, data: { comments: { connect: { id: comment1.id } } } })
+        ).toResolveTruthy();
+    });
 });

tests/regression/tests/issue-1674.test.ts

@@ -0,0 +1,87 @@
+import { loadSchema } from '@zenstackhq/testtools';
+describe('issue 1674', () => {
+    it('regression', async () => {
+        const { prisma, enhance } = await loadSchema(
+            `
+            model User {
+                id       String @id @default(cuid())
+                email    String @unique @email @length(6, 32)
+                password String @password @omit
+                posts    Post[]
+
+                // everybody can signup
+                @@allow('create', true)
+
+                // full access by self
+                @@allow('all', auth() == this)
+            }
+
+            model Blog {
+                id        String   @id @default(cuid())
+                createdAt DateTime @default(now())
+                updatedAt DateTime @updatedAt
+
+                post      Post? @relation(fields: [postId], references: [id], onDelete: Cascade)
+                postId String?
+            }
+
+            model Post {
+                id        String   @id @default(cuid())
+                createdAt DateTime @default(now())
+                updatedAt DateTime @updatedAt
+                title     String   @length(1, 256)
+                content   String
+                published Boolean  @default(false)
+                author    User     @relation(fields: [authorId], references: [id])
+                authorId  String
+
+                blogs Blog[] 
+
+                type String
+
+                // allow read for all signin users
+                @@allow('read', auth() != null && published)
+
+                // full access by author
+                @@allow('all', author == auth())
+
+                @@delegate(type)
+            }
+
+            model PostA extends Post {
+            }
+
+            model PostB extends Post {
+            }
+            `
+        );
+
+        const user = await prisma.user.create({
+            data: { email: '[email protected]', password: 'password' },
+        });
+
+        const blog = await prisma.blog.create({
+            data: {},
+        });
+
+        const db = enhance(user);
+        await expect(
+            db.postA.create({
+                data: {
+                    content: 'content',
+                    title: 'title',
+                    blogs: {
+                        connect: {
+                            id: blog.id,
+                        },
+                    },
+                    author: {
+                        connect: {
+                            id: user.id,
+                        },
+                    },
+                },
+            })
+        ).toBeRejectedByPolicy();
+    });
+});