Product should be defined.
    ✘ TypeError: 'undefined' is not an object (evaluating 'this.collectionType.prototype') in http://localhost:7357/a
pp/bower_components/backbone-relational/backbone-relational.js (line 835)
        TypeError: 'undefined' is not an object (evaluating 'this.collectionType.prototype')
            at http://localhost:7357/app/bower_components/backbone-relational/backbone-relational.js:835
            at http://localhost:7357/app/bower_components/backbone-relational/backbone-relational.js:537
            at http://localhost:7357/app/bower_components/backbone/backbone-min.js:1
            at http://localhost:7357/app/bower_components/backbone-relational/backbone-relational.js:137
            at http://localhost:7357/app/bower_components/backbone-relational/backbone-relational.js:1176