fix(polymorphism): unique constraint name disambiguation

packages/schema/src/plugins/prisma/schema-generator.ts

@@ -549,9 +549,18 @@ export class PrismaSchemaGenerator {
                         }
                     }
 
-                    model.addAttribute('@@unique', [
+                    const uniqueConstraint = model.addAttribute('@@unique', [
                         new PrismaAttributeArg(undefined, new PrismaAttributeArgValue('Array', args)),
                     ]);
+
+                    if (this.supportNamedConstraints) {
+                        const fieldNames = args.map((arg) => (arg.value as PrismaFieldReference).field).join('_');
+                        const constraintName = this.truncate(`${model.name}_${fieldNames}_unique`);
+                        uniqueConstraint.args.push(
+                            // generate a `map` argument for unique constraint name disambiguation
+                            new PrismaAttributeArg('map', new PrismaAttributeArgValue('String', constraintName)),
+                        );
+                    }
                 }
             }
         }

tests/regression/tests/issue-2001.test.ts

@@ -0,0 +1,49 @@
+import { loadSchema } from '@zenstackhq/testtools';
+
+describe('issue 2001', () => {
+    it('regression', async () => {
+        await loadSchema(
+            `
+            model User {
+              id       Int       @id @default(autoincrement())
+
+              contentUserLikes ContentUserLikes[]
+
+              @@allow('all', true)
+            }
+
+            model Content {
+              id          Int      @id @default(autoincrement())
+              contentType String
+
+              contentUserLikes ContentUserLikes[]
+
+              @@delegate(contentType)
+
+              @@allow('all', true)
+            }
+
+            model Post extends Content {
+              title String
+            }
+
+            model Video extends Content {
+              name     String
+              duration Int
+            }
+
+            model ContentUserLikes {
+                id          Int      @id @default(autoincrement())
+                userId Int
+                user   User @relation(fields: [userId], references: [id], onDelete: Cascade, onUpdate: Restrict)
+
+                contentId Int
+                content Content @relation(fields: [contentId], references: [id], onDelete: Cascade, onUpdate: Restrict)
+
+                @@unique([userId, contentId])
+            }
+            `,
+            { provider: 'postgresql', dbUrl: 'env("DATABASE_URL")', pushDb: false }
+        );
+    });
+});