fix: default auth without user context

packages/runtime/src/enhancements/default-auth.ts

@@ -15,7 +15,7 @@ import { DefaultPrismaProxyHandler, PrismaProxyActions, makeProxy } from './prox
 export function withDefaultAuth<DbClient extends object>(
     prisma: DbClient,
     options: InternalEnhancementOptions,
-    context?: EnhancementContext
+    context: EnhancementContext = {}
 ): DbClient {
     return makeProxy(
         prisma,
@@ -32,14 +32,10 @@ class DefaultAuthHandler extends DefaultPrismaProxyHandler {
         prisma: DbClientContract,
         model: string,
         options: InternalEnhancementOptions,
-        private readonly context?: EnhancementContext
+        private readonly context: EnhancementContext
     ) {
         super(prisma, model, options);
 
-        if (!this.context?.user) {
-            throw new Error(`Using \`auth()\` in \`@default\` requires a user context`);
-        }
-
         this.userContext = this.context.user;
     }
 
@@ -95,6 +91,9 @@ class DefaultAuthHandler extends DefaultPrismaProxyHandler {
     }
 
     private getDefaultValueFromAuth(fieldInfo: FieldInfo) {
+        if (!this.userContext) {
+            throw new Error(`Evaluating default value of field \`${fieldInfo.name}\` requires a user context`);
+        }
         return fieldInfo.defaultValueProvider?.(this.userContext);
     }
 }

tests/integration/tests/enhancements/with-policy/auth.test.ts

@@ -505,4 +505,33 @@ describe('With Policy: auth() test', () => {
             ])
         );
     });
+
+    it('Default auth() without user context', async () => {
+        const { enhance } = await loadSchema(
+            `
+        model User {
+            id String @id
+            posts Post[]
+
+            @@allow('all', true)
+        }
+
+        model Post {
+            id String @id @default(uuid())
+            title String
+            author User @relation(fields: [authorId], references: [id])
+            authorId String @default(auth().id)
+
+            @@allow('all', true)
+        }
+        `
+        );
+
+        const db = enhance();
+        await expect(db.user.create({ data: { id: 'userId-1' } })).toResolveTruthy();
+        await expect(db.post.create({ data: { title: 'title' } })).rejects.toThrow(
+            'Evaluating default value of field `authorId` requires a user context'
+        );
+        await expect(db.post.findMany({})).toResolveTruthy();
+    });
 });