Mongoose error on creating Model (using Step)

Question

When trying to create a model in Mongoose I get the following error

[TypeError: Cannot read property 'options' of undefined]

I have no idea what's causing it

"use strict"; var Step = require('step'); var mongoose = require('mongoose'); var Schema = mongoose.Schema;  function randomFunction() {     var categorySchema = new Schema({         id: Number,         name: String,         description: String     }, { collection: 'categories' });      var Category;      //...      mongoose.connect('mongodb://localhost/grouping');      new Step(         function() { //Connect to mongodb             var db = mongoose.connection;             db.on('error', console.error.bind(console, 'connection error:'));             db.on('open', this);         },         function() {  //Create model             console.log(categorySchema); //Logs the schema object right             Category = mongoose.Model('Category', categorySchema);           },         function(err) {             console.log(err);  //Error here         });     //... } 

I'm very new to Mongo (and fairly new to node) but I have absolutely no idea what the error message means.

I know I have options defined in the schema but I cant see how it would be undefined, can anyone point me in the right direction?

Note - this is a big cut out of the original code, this is the general structure (there's actually some code below mongoose.Model('Cat... but it gets skipped, I assume because the error is thrown by the mongoose.Model call as not even a console.log("Hello"); is printed straight after it.

EDIT I've found that inside Mongoose (mongoose/lib/document.js) tries to get this.schema but it's undefined

function Document (obj, fields, skipId) { //Line 37     this.$__ = new InternalCache;     this.isNew = true;     this.errors = undefined;      var schema = this.schema; //-> undefined     // ... 

Answer 1

So it turns out I'm not the observent kind,

mongoose.Model should be mongoose.model

Answer 2

You can also get the same error for calling this.

MyModel = new mongoose.model('<your model name>', mySchema)

if you do remove the new.