Subscribing via argument from Route

routes.js

this.route('report', {
        path: '/reports/:_id',
        template: 'report',
        data: function () {
            return {
                reports:Reports.findOne({_id:this.params._id})
            };
        },
        waitOn: function(){
            return subscriptionHandles.singlereport(this.params._id);
        },
        action: function() {
            if(this.ready() && this.data())
                this.render();
        }
    });

subscriptions.js

subscriptionHandles = {
    singlereport: function(reportID) {
        return Meteor.subscribe("singlereport", reportID)
    }
};