Type Error in Promisifying Mongoose Connect
I am working on the same tutorial.
Bluebird changes the api in 3.0 from// 2.x Promise.promisify(fn, ctx);// 3.0 Promise.promisify(fn, {context: ctx});
I made the call change and the calls stopped throwing the errors.
See here for the Bluebird explanation:http://bluebirdjs.com/docs/new-in-bluebird-3.html
Hope this helps