Embedded discriminators: pushing a subdocument does not work

[davebaol]

As @meammeiam reported in issue 1856, if you try to push a new event it saves an empty item.

To reproduce this issue just add the code below to the code from the blog post about embedded discriminators:

Batch.create(batch).then(function(doc) {
    doc.events.push({ kind: 'Purchased', product: 24 });
    doc.save().then(function(doc) {
        console.log(doc);
    });
});

Software versions:

• node.js 6.1.0
• mongodb 3.4.1
• mongoose 4.8.4

[davebaol]

@vkarpov15
Thanks, your fix works like a charm. Great work!

[meammeiam]

@vkarpov15
Yes, It works great now! Thank you very much for your hard work! Mongoose is awesome!

@davebaol Thanks for filing the bug!