Mongoose models fail to sync

[tracend]

After the latest update to Mongoose (v3.6) the models aren't always available in their expected form.

Most likely this has to do with passing the models as constructors from one file to the other - which is not considered best practice.

When they reach the Sync class they have 'lost' their constructor attributes (schema etc.)

Console.log:

    backend.handle(req, res, function(err) {
            ^
TypeError: Object function model(doc, fields, skipId) {
    if (!(this instanceof model))
      return new model(doc, fields, skipId);
    Model.call(this, doc, fields, skipId);
  } has no method 'handle'
    at Sync.handle (/Users/tracend/Repositories/Websites/assetorium/node_modules/crudr/lib/sync.js:55:13)
    at Sockets.events.Object.keys.forEach.self.io.of.on.events.created (/Users/tracend/Repositories/Websites/assetorium/node_modules/crudr/lib/sockets.js:115:11)