Mongodb: db.collection.copyTo() and eval() have been deprecated. What's the alternatives?

Question

I find that db.collection.copyTo() and eval() have been deprecated since 3.0. But I do not find what can be instead.

What\'s the alternatives?

Answer 1

For a server-side solution you can use aggregation...

db.getCollection('source')
    .aggregate([
        { $out: 'destination' }
    ]);