add test for pg computed values across multiple schema

tests/e2e/orm/client-api/pg-computed-multischema.test.ts

@@ -0,0 +1,53 @@
+import { createTestClient } from '@zenstackhq/testtools';
+import { describe, expect, it } from 'vitest';
+
+describe('Postgres multi-schema with computed fields', () => {
+    it('supports computed fields on models in custom schemas', async () => {
+        const db = await createTestClient(
+            `
+            datasource db {
+                provider = "postgresql"
+                url = '$DB_URL'
+                schemas = ["public", "mySchema1", "mySchema2"]
+            }
+
+            model Author {
+                id    Int    @id @default(autoincrement())
+                name  String
+                books Book[]
+                @@schema("mySchema1")
+            }
+
+            model Book {
+                id       Int    @id @default(autoincrement())
+                title    String
+                authorId Int
+                author   Author @relation(fields: [authorId], references: [id])
+                authorName String @computed()
+                @@schema("mySchema2")
+            }
+            `,
+            {
+                provider: 'postgresql',
+                usePrismaPush: true,
+                computedFields: {
+                    Book: {
+                        authorName: (eb: any) => eb
+                            .selectFrom('mySchema1.Author')
+                            .select('Author.name')
+                            .whereRef('Author.id', '=', 'authorId')
+                            .limit(1)
+                    },
+                },
+            } as any
+        );
+
+        // Create author and book
+        const author = await db.author.create({ data: { name: 'Jane Doe' } });
+        const book = await db.book.create({ data: { title: 'ZenStack Guide', authorId: author.id } });
+
+        // Fetch book and check computed field
+        const fetched = await db.book.findUnique({ where: { id: book.id } });
+        expect(fetched?.authorName).toBe('Jane Doe');
+    });
+});