Uncaught TypeError: Cannot read property 'idAttribute' of undefined - backbone.js

Question

I am using Backbone-Relational, and I recieve the following error:
Uncaught TypeError: Cannot read property 'idAttribute' of undefined
When I access the show_note route.
App.Router = Backbone.Router.extend({
routes: {
'note/:_id': 'show_note'
},
show_note: function(_id) {
console.log('this is the show_note route for _id: ' + _id);
var note = new App.Models.Note.findOrCreate({ _id: _id });
var note_view = new App.Views.main_note({ model: note });
note.fetch();
}
});
The console.log recieves the '_id'. But when I attempt to instantiate var note, I recieve the error. How do I fix this?
EDIT 1
Adding the Note model:
App.Models.Note = Backbone.RelationalModel.extend({
urlRoot: '/notes',
idAttribute: '_id',
relations: [{
type: Backbone.HasMany,
key: 'tags',
relatedModel: 'App.Models.Tag',
reverseRelation: {
key: 'note',
includeInJSON: '_id'
}
}]
});
EDIT 2
Stacktrace added

Answer 1

I solved the issue by removing findOrCreate(), and ended up retrieving the model data like so:
App.Router = Backbone.Router.extend({
routes: {
'note/:_id': 'show_note'
},
show_note: function(_id) {
var note = new App.Models.Note({ _id: _id });
note.fetch({
success: function(data) {
var mainNoteView = new App.Views.main_note({ model: note });
$('#mainNote').append( mainNoteView.render().el );
},
error: function(err) {
console.log(err);
}
});
}
});