bulk operations with mongoskin and mongodb 3.x?

[pleasantone]

I've read the various bits of literature, and I'm seeing the same problem that the questioner in

http://stackoverflow.com/a/25636911

was seeing.

My code looks like something like this (I wrote it in coffeescript and am converting to js pseudocode):

coll = db.collection('foobar');
bulk = coll.initializeUnorderedBulkOp();
messages.forEach(function(entry) {
    bulk.insert(entry);
});
bulk.execute(function (err, result) {
   if (err) throw err
   inserted += result.nInserted
});

1. bulk is an object
2. bulk.insert works just fine
3. bulk.execute is undefined

The answer in the stackoverflow question said, "only the callback flavor of db.collection() works,
so I tried:

db.collection('foobar', function (err, coll) {
    logger.debug("got here");
    if (err) throw(err);
   bulk = coll.initializeUnorderedBulkOp();
   ... same code as before

We never get to "got here" implying that the "callback flavor" of db.collection() was dropped for 3.0? Unfortunately, my python is way better than my JS prototyping skills, so looking at the skin source code doesn't make any sense to me.

What is the right way, with mongoskin 2.1.0 and the 2.2.0 mongodb JS driver, to do a bulk operation, or is this not implemented at all anymore?

[pleasantone]

Don't do this, use insert with an array of documents instead.