如何用猫鼬长加减法？

Question

I am trying to use mongoose-long for large numbers. I'm not sure I am using it correctly. I set the value...

 user = new User({val:12345678901234});

val is mongoose.Schema.Types.Long

1) What is the correct way to show val, toString()?

2) So how do I manipulate (add, subtract) this value? Javascript doesn't support full 64bit values, so do I have to do this through mongodb's $inc?

Thanks

Answer 1

You'd want to use $inc to atomically manipulate the value in the stored docs, but outside of update operations you can use the methods of Long :

var sum = user.val.add(123);
console.log(sum.toString());