fix(policy): handle DefaultInsertValueNode in createManyAndReturn (#2461)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: pkudinov

packages/plugins/policy/src/policy-handler.ts

@@ -920,6 +920,10 @@ export class PolicyHandler<Schema extends SchemaDef> extends OperationNodeTransf
         for (let i = 0; i < data.length; i++) {
             const item = data[i]!;
             if (typeof item === 'object' && item && 'kind' in item) {
+                if (item.kind === 'DefaultInsertValueNode') {
+                    result.push({ node: ValueNode.create(null), raw: null });
+                    continue;
+                }
                 const fieldDef = QueryUtils.requireField(this.client.$schema, model, fields[i]!);
                 invariant(item.kind === 'ValueNode', 'expecting a ValueNode');
                 result.push({

tests/regression/test/issue-2460.test.ts

@@ -0,0 +1,37 @@
+import { createPolicyTestClient } from '@zenstackhq/testtools';
+import { describe, expect, it } from 'vitest';
+
+// createManyAndReturn fails with "Invariant failed: expecting a ValueNode"
+// when rows in the batch have asymmetric columns (one row provides a field the other omits)
+describe('Regression for issue #2460', () => {
+    it('createManyAndReturn with asymmetric optional fields across rows', async () => {
+        const db = await createPolicyTestClient(
+            `
+model User {
+    id   Int    @id @default(autoincrement())
+    role String
+    @@allow('all', true)
+}
+
+model Item {
+    id   Int     @id @default(autoincrement())
+    key  String
+    note String?
+    @@allow('all', auth().role == 'admin')
+}
+            `,
+            { provider: 'postgresql' },
+        );
+
+        const user = await db.user.create({ data: { role: 'admin' } });
+
+        const result = await db.$setAuth(user).item.createManyAndReturn({
+            data: [
+                { key: 'a', note: 'hello' },
+                { key: 'b' },
+            ],
+        });
+
+        expect(result).toHaveLength(2);
+    });
+});