Cannot call method path on undefined when populating

[TylerS]

I have two schemas, defined like so (extra fields ommitted): 

Transaction = new Schema({

'lineItems' : {type: [LineItem]},

'orderNumber' : { type: Number}

});

LineItem = new Schema({

'product' : {type: Schema.ObjectId,ref: 'Product'}

});

I then have a query, which is attempting to populate the lineItems.product documents:

var qry = app.Transaction.findOne({orderNumber : req.params.orderNumber})

.populate('lineItems.product')

.run(function(err,transaction) {

res.render('store/receipt', { transaction : transaction})

})

This is throwing the following error when it tries to populate lineItems.product:

[ERROR] TypeError

TypeError: Cannot call method 'path' of undefined

    at /home/tyler/projects/prescribed/node_modules/mongoose/lib/model.js:233:44

    at /home/tyler/projects/prescribed/node_modules/mongoose/lib/model.js:239:14

    at Array.forEach (native)

When I debugged into it, I found that the subschema on line 233 is undefined, however I'm not sure how this could be? 

[Arlo]

I've run into this crash tonight as well. I'm using the current version of Mongoose.

My structure seems to be identical (this is trimmed):

The Models:

Share = new Schema({

data: String,

comments: [Comment],

user_id: { type: Schema.ObjectId, ref: 'User' }

});

Comment = new Schema({

data: String,

user_id: { type: Schema.ObjectId, ref: 'User' }

});

Inside Node/Express:

Share.findById( req.params.id ).populate('comments.user_id').run( function(err, share) {

res.send(share.comments);

});

Crash:

TypeError: Cannot call method 'path' of undefined

    at /home/ubuntu/www/node_modules/mongoose/lib/model.js:234:44

    at /home/ubuntu/www/node_modules/mongoose/lib/model.js:240:14

    at Array.forEach (native)

[Aaron Heckmann]

In both examples it appears that the schemas are defined in reverse order.

child schemas should be defined first before passing them into parent schemas, otherwise with javascript variable hoisting you are just passing undefined.

LineItem = new Schema({

'product' : {type: Schema.ObjectId,ref: 'Product'}

});

Transaction = new Schema({

'lineItems' : {type: [LineItem]},

'orderNumber' : { type: Number}

});

// LineItem down here is too late since its already been passed into the parent.

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[Tyler Schroeder]

Doh! Thank you, that did the trick. 

[Arlo]

You'd think I'd have known this from having to do the same thing in Django Models.

Whew... thanks!