fix(core): update

test/test.ts

@@ -200,14 +200,19 @@ class Truck extends smartdata.SmartDataDbDoc<Car, Car> {
 tap.test('should store a new Truck', async () => {
   const truck = new Truck('blue', 'MAN');
   await truck.save();
-  const myTruck = await Truck.getInstance({ color: 'blue' });
-  myTruck.id = 'foo';
-  await myTruck.save();
   const myTruck2 = await Truck.getInstance({ color: 'blue' });
-  console.log(myTruck2);
+  myTruck2.color = 'red';
+  await myTruck2.save();
+  const myTruck3 = await Truck.getInstance({ color: 'blue' });
+  console.log(myTruck3);
 });
 
-tap.test('should ', async () => {});
+tap.test('should use a cursor', async () => {
+  const cursor = await Truck.getCursor({});
+  cursor.forEach(async truckArg => {
+    console.log(truckArg.id);
+  });
+});
 
 // =======================================
 // close the database connection