fix(policy): only include field selections for evaluating field-level policies if the corresponding fields are selected

fixes #1978

Author: ymc9

packages/runtime/src/enhancements/node/policy/policy-utils.ts

@@ -1183,7 +1183,7 @@ export class PolicyUtil extends QueryUtils {
 
         if (this.hasFieldLevelPolicy(model)) {
             // recursively inject selection for fields needed for field-level read checks
-            const readFieldSelect = this.getFieldReadCheckSelector(model);
+            const readFieldSelect = this.getFieldReadCheckSelector(model, args.select);
             if (readFieldSelect) {
                 this.doInjectReadCheckSelect(model, args, { select: readFieldSelect });
             }
@@ -1311,17 +1311,20 @@ export class PolicyUtil extends QueryUtils {
     }
 
     // get a merged selector object for all field-level read policies
-    private getFieldReadCheckSelector(model: string) {
+    private getFieldReadCheckSelector(model: string, fieldSelection: Record<string, any> | undefined) {
         const def = this.getModelPolicyDef(model);
         let result: any = {};
         const fieldLevel = def.fieldLevel?.read;
         if (fieldLevel) {
-            for (const def of Object.values(fieldLevel)) {
-                if (def.entityChecker?.selector) {
-                    result = deepmerge(result, def.entityChecker.selector);
-                }
-                if (def.overrideEntityChecker?.selector) {
-                    result = deepmerge(result, def.overrideEntityChecker.selector);
+            for (const [field, def] of Object.entries(fieldLevel)) {
+                if (!fieldSelection || fieldSelection[field]) {
+                    // field is selected, merge the field-level selector
+                    if (def.entityChecker?.selector) {
+                        result = deepmerge(result, def.entityChecker.selector);
+                    }
+                    if (def.overrideEntityChecker?.selector) {
+                        result = deepmerge(result, def.overrideEntityChecker.selector);
+                    }
                 }
             }
         }

tests/regression/tests/issue-1978.test.ts

@@ -0,0 +1,41 @@
+import { loadSchema } from '@zenstackhq/testtools';
+
+describe('issue 1978', () => {
+    it('regression', async () => {
+        const { prisma, enhance } = await loadSchema(
+            `
+            model User {
+                id Int @id
+                posts Post[]
+                secret String @allow('read', posts?[published])
+                @@allow('all', true)
+            }
+            
+            model Post {
+                id Int @id
+                author User @relation(fields: [authorId], references: [id])
+                authorId Int
+                published Boolean @default(false)
+                @@allow('all', true)
+            }
+            `,
+            { logPrismaQuery: true }
+        );
+
+        const user1 = await prisma.user.create({
+            data: { id: 1, secret: 'secret', posts: { create: { id: 1, published: true } } },
+        });
+        const user2 = await prisma.user.create({
+            data: { id: 2, secret: 'secret' },
+        });
+
+        const db = enhance();
+        await expect(db.user.findFirst({ where: { id: 1 } })).resolves.toMatchObject({ secret: 'secret' });
+        await expect(db.user.findFirst({ where: { id: 1 }, select: { id: true } })).resolves.toEqual({ id: 1 });
+
+        let r = await db.user.findFirst({ where: { id: 2 } });
+        expect(r.secret).toBeUndefined();
+        r = await db.user.findFirst({ where: { id: 2 }, select: { id: true } });
+        expect(r.secret).toBeUndefined();
+    });
+});