this is a backwards compatible approach to namespace-less nested routes.

idea.js

Router.map(function(root) {
  // this === root
  this.route("articles", function(scope) {
    // this === scope, hence making `scope` an optional
    // arg unless you have some reason to use it within callbacks below
 
    // these two are identical and generate a route
    // named "articles.show"
    this.route("show");
    //scope.route("show");
 
    // but if you want to declare a route that doesn't 
    // get namespaced, you can use `root`
    root.route("comments");
  });
});