fix: allow POST /users/@me/channels with recipient_id 0 (#1160)

packages/schema/src/domains/tests/UserRequestSchemas.test.ts

@@ -79,4 +79,11 @@ describe('CreatePrivateChannelRequest', () => {
 		);
 		expect(CreatePrivateChannelRequest.safeParse({recipients}).success).toBe(false);
 	});
+	it('allows DM requests to the system user id 0', () => {
+		const parsed = CreatePrivateChannelRequest.safeParse({recipient_id: '0'});
+		expect(parsed.success).toBe(true);
+		if (parsed.success) {
+			expect(parsed.data.recipient_id).toBe(0n);
+		}
+	});
 });

packages/schema/src/domains/user/UserRequestSchemas.ts

@@ -272,9 +272,13 @@ export const CreatePrivateChannelRequest = z
 			.optional()
 			.describe(`Array of user IDs for creating a group DM (max ${MAX_GROUP_DM_OTHER_RECIPIENTS})`),
 	})
-	.refine((data) => (data.recipient_id && !data.recipients) || (!data.recipient_id && data.recipients), {
-		message: 'Either recipient_id or recipients must be provided, but not both',
-	});
+	.refine(
+		(data) =>
+			(data.recipient_id != null && data.recipients == null) || (data.recipient_id == null && data.recipients != null),
+		{
+			message: 'Either recipient_id or recipients must be provided, but not both',
+		},
+	);
 
 export type CreatePrivateChannelRequest = z.infer<typeof CreatePrivateChannelRequest>;