Calling router.map now appends the routes instead of replacing them

packages/ember-routing/lib/system/router.js

@@ -302,18 +302,26 @@ function transitionCompleted(router) {
 
 Ember.Router.reopenClass({
   map: function(callback) {
-    var router = this.router = new Router();
+    var router = this.router;
+    if (!router){
+      router = this.router = new Router();
+      router.callbacks = [];
+    }
 
     if (get(this, 'namespace.LOG_TRANSITIONS_INTERNAL')) {
       router.log = Ember.Logger.debug;
     }
 
     var dsl = Ember.RouterDSL.map(function() {
       this.resource('application', { path: "/" }, function() {
+        for (var i=0; i < router.callbacks.length; i++){
+          router.callbacks[i].call(this);
+        }
         callback.call(this);
       });
     });
 
+    router.callbacks.push(callback);
     router.map(dsl.generate());
     return router;
   }

packages/ember/tests/routing/basic_test.js

@@ -35,6 +35,7 @@ module("Basic Routing", {
       Ember.TEMPLATES.application = compile("{{outlet}}");
       Ember.TEMPLATES.home = compile("<h3>Hours</h3>");
       Ember.TEMPLATES.homepage = compile("<h3>Megatroll</h3><p>{{home}}</p>");
+      Ember.TEMPLATES.camelot = compile('<section><h3>Is a silly place</h3></section>');
     });
   },
 
@@ -74,6 +75,53 @@ test("The Homepage", function() {
   equal(Ember.$('h3:contains(Hours)', '#qunit-fixture').length, 1, "The home template was rendered");
 });
 
+test("The Home page and the Camelot page with multiple Router.map calls", function() {
+  Router.map(function() {
+    this.route("home", { path: "/" });
+  });
+
+  Router.map(function() {
+    this.route("camelot", {path: "/camelot"});
+  });
+
+  App.HomeRoute = Ember.Route.extend({
+  });
+
+  App.CamelotRoute = Ember.Route.extend({
+  });
+
+  var currentPath;
+
+  App.ApplicationController = Ember.Controller.extend({
+    currentPathDidChange: Ember.observer(function() {
+      currentPath = get(this, 'currentPath');
+    }, 'currentPath')
+  });
+
+  App.CamelotController = Ember.Controller.extend({
+    currentPathDidChange: Ember.observer(function() {
+      currentPath = get(this, 'currentPath');
+    }, 'currentPath')
+  });
+
+  bootApplication();
+
+  Ember.run(function() {
+    router.handleURL("/camelot");
+  });
+
+  equal(currentPath, 'camelot');
+  equal(Ember.$('h3:contains(silly)', '#qunit-fixture').length, 1, "The camelot template was rendered");
+
+
+  Ember.run(function() {
+    router.handleURL("/");
+  });
+
+  equal(currentPath, 'home');
+  equal(Ember.$('h3:contains(Hours)', '#qunit-fixture').length, 1, "The home template was rendered");
+});
+
 test("The Homepage register as activeView", function() {
   Router.map(function() {
     this.route("home", { path: "/" });