diff --git a/index.js b/index.js
index e5fd172..a79cea6 100644
--- a/index.js
+++ b/index.js
@@ -149,8 +149,7 @@ Resource.prototype.map = function(method, path, fn){
     , fn: fn
   };
 
-  // apply the route
-  this.app[method](route, function(req, res, next){
+  this._applyRoute(method, route, function(req, res, next){
     req.format = req.params.format || req.format || self.format;
     if (req.format) res.type(req.format);
     if ('object' == typeof fn) {
@@ -167,6 +166,10 @@ Resource.prototype.map = function(method, path, fn){
   return this;
 };
 
+Resource.prototype._applyRoute = function(method, route, fn){
+  this.app[method](route, fn);
+};
+
 /**
  * Nest the given `resource`.
  *
@@ -177,18 +180,24 @@ Resource.prototype.map = function(method, path, fn){
  */
 
 Resource.prototype.add = function(resource){
+  var relativeBase = this.base
+    + (this.name ? this.name + '/': '')
+    + this.param + '/';
+
+  resource._updatePathBase(relativeBase)
+
+  return this;
+};
+
+Resource.prototype._updatePathBase = function(newBase){
   var app = this.app
     , routes
     , route;
 
-  // relative base
-  resource.base = this.base
-    + (this.name ? this.name + '/': '')
-    + this.param + '/';
-
+  this.base = newBase;
   // re-define previous actions
-  for (var method in resource.routes) {
-    routes = resource.routes[method];
+  for (var method in this.routes) {
+    routes = this.routes[method];
     for (var key in routes) {
       route = routes[key];
       delete routes[key];
@@ -198,11 +207,9 @@ Resource.prototype.add = function(resource){
           app.routes[method].splice(i, 1);
         }
       })
-      resource.map(route.method, route.orig, route.fn);
+      this.map(route.method, route.orig, route.fn);
     }
   }
-
-  return this;
 };
 
 /**
@@ -263,11 +270,15 @@ methods.concat(['del', 'all']).forEach(function(method){
 
 app.resource = function(name, actions, opts){
   var options = actions || {};
+  var Resource = (opts || {}).resourceConstructor || app.resource.constructor
   if ('object' == typeof name) actions = name, name = null;
   if (options.id) actions.id = options.id;
   this.resources = this.resources || {};
   if (!actions) return this.resources[name] || new Resource(name, null, this);
   for (var key in opts) options[key] = opts[key];
+  delete options.resourceConstructor
   var res = this.resources[name] = new Resource(name, actions, this);
   return res;
 };
+
+app.resource.constructor = Resource;
diff --git a/test/resource.test.js b/test/resource.test.js
index 4693f62..dacd49f 100644
--- a/test/resource.test.js
+++ b/test/resource.test.js
@@ -33,164 +33,164 @@ describe('app.resource()', function(){
     request(app)
     .post('/forums')
     .expect('create forum', next());
-    
+
     request(app)
     .get('/forums/5')
     .expect('show forum 5', next());
-    
+
     request(app)
     .get('/forums/5/edit')
     .expect('edit forum 5', next());
-    
+
     request(app)
     .del('/forums/5')
     .expect('destroy forum 5', next());
   })
 
   it('should support root resources', function(done){
-     var app = express();
-     var next = batch(done);
-     var forum = app.resource(require('./fixtures/forum'));
-     var thread = app.resource('threads', require('./fixtures/thread'));
-     forum.map(thread);
-  
-     request(app)
-     .get('/')
-     .expect('forum index', next());
-  
-     // request(app)
-     // .get('/12')
-     // .expect('show forum 12', next());
-  
-     // request(app)
-     // .get('/12/threads')
-     // .expect('thread index of forum 12', next());
-  
-     // request(app)
-     // .get('/1/threads/50')
-     // .expect('show thread 50 of forum 1', next());
-   })
-  
-   describe('"id" option', function(){
-     it('should allow overriding the default', function(done){
-       var app = express();
-       var next = batch(done);
-     
-       app.resource('users', {
-         id: 'uid',
-         show: function(req, res){
-           res.send(req.params.uid);
-         }
-       });
-  
-       request(app)
-       .get('/users')
-       .expect(404, next());
-  
-       request(app)
-       .get('/users/10')
-       .expect('10', next());
-     })
-   })
-  
-   describe('with several segments', function(){
-     it('should work', function(done){
-       var app = express();
-       var next = batch(done);
-       var cat = app.resource('api/cat', require('./fixtures/cat'));
-  
-       request(app)
-       .get('/api/cat')
-       .expect('list of cats', next());
-  
-       request(app)
-       .get('/api/cat/new')
-       .expect('new cat', next());
-     })
-   })
-  
-   it('should allow configuring routes', function(done){
-     var app = express();
-     var next = batch(done);
-     var Forum = require('./fixtures/forum').Forum;
-     
-     function load(id, fn) { fn(null, "User"); }
-  
-     var actions = {
-       login: function(req, res){
-         res.end('login');
-       },
-       logout: function(req, res){
-         res.end('logout');
-       }
-     };
-     
-     var users = app.resource('users', actions, { load: load });
-     users.map('get', 'login', actions.login);
-     users.map('get', '/logout', actions.logout);
-  
-     request(app)
-     .get('/users/1/login')
-     .expect('login', next());
-  
-     request(app)
-     .get('/users/logout')
-     .expect('logout', next());
-   })
-  
-   describe('autoloading', function(){
-     describe('when no resource is found', function(){
-       it('should not invoke the callback', function(done){
-          var app = express();
-       
-          function load(id, fn) { fn(); }
-          var actions = { show: function(){
-            assert.fail('called show when loader failed');
-          }};
-       
-          app.resource('pets', actions, { load: load });
-  
-          request(app)
-          .get('/pets/0')
-          .expect(404, done);
-       })
-     })
-  
-     describe('when a resource is found', function(){
-       it('should invoke the callback', function(done){
-         var app = express();
-         var Forum = require('./fixtures/forum').Forum;
-       
-         var actions = { show: function(req, res){
-           res.end(req.forum.title);
-         }};
-       
-         var forum = app.resource('forum', actions);
-         forum.load(Forum.get);
-  
-         request(app)
-         .get('/forum/12')
-         .expect('Ferrets', done);
-       })
-  
-       it('should work recursively', function(done){
+    var app = express();
+    var next = batch(done);
+    var forum = app.resource(require('./fixtures/forum'));
+    var thread = app.resource('threads', require('./fixtures/thread'));
+    forum.map(thread);
+
+    request(app)
+    .get('/')
+    .expect('forum index', next());
+
+    // request(app)
+    // .get('/12')
+    // .expect('show forum 12', next());
+
+    // request(app)
+    // .get('/12/threads')
+    // .expect('thread index of forum 12', next());
+
+    // request(app)
+    // .get('/1/threads/50')
+    // .expect('show thread 50 of forum 1', next());
+  })
+
+  describe('"id" option', function(){
+    it('should allow overriding the default', function(done){
+      var app = express();
+      var next = batch(done);
+
+      app.resource('users', {
+        id: 'uid',
+        show: function(req, res){
+          res.send(req.params.uid);
+        }
+      });
+
+      request(app)
+      .get('/users')
+      .expect(404, next());
+
+      request(app)
+      .get('/users/10')
+      .expect('10', next());
+    })
+  })
+
+  describe('with several segments', function(){
+    it('should work', function(done){
+      var app = express();
+      var next = batch(done);
+      var cat = app.resource('api/cat', require('./fixtures/cat'));
+
+      request(app)
+      .get('/api/cat')
+      .expect('list of cats', next());
+
+      request(app)
+      .get('/api/cat/new')
+      .expect('new cat', next());
+    })
+  })
+
+  it('should allow configuring routes', function(done){
+    var app = express();
+    var next = batch(done);
+    var Forum = require('./fixtures/forum').Forum;
+
+    function load(id, fn) { fn(null, "User"); }
+
+    var actions = {
+      login: function(req, res){
+        res.end('login');
+      },
+      logout: function(req, res){
+        res.end('logout');
+      }
+    };
+
+    var users = app.resource('users', actions, { load: load });
+    users.map('get', 'login', actions.login);
+    users.map('get', '/logout', actions.logout);
+
+    request(app)
+    .get('/users/1/login')
+    .expect('login', next());
+
+    request(app)
+    .get('/users/logout')
+    .expect('logout', next());
+  })
+
+  describe('autoloading', function(){
+    describe('when no resource is found', function(){
+      it('should not invoke the callback', function(done){
          var app = express();
-         var Forum = require('./fixtures/forum').Forum;
-         var Thread = require('./fixtures/thread').Thread;
-       
-         var actions = { show: function(req, res){
-           res.end(req.forum.title + ': ' + req.thread.title);
+
+         function load(id, fn) { fn(); }
+         var actions = { show: function(){
+           assert.fail('called show when loader failed');
          }};
-       
-         var forum = app.resource('forum', { load: Forum.get });
-         var threads = app.resource('thread', actions, { load: Thread.get });
-       
-         forum.add(threads);
-  
+
+         app.resource('pets', actions, { load: load });
+
          request(app)
-         .get('/forum/12/thread/1')
-         .expect('Ferrets: Tobi rules', done);
-       })
-     })
-   })
+         .get('/pets/0')
+         .expect(404, done);
+      })
+    })
+
+    describe('when a resource is found', function(){
+      it('should invoke the callback', function(done){
+        var app = express();
+        var Forum = require('./fixtures/forum').Forum;
+
+        var actions = { show: function(req, res){
+          res.end(req.forum.title);
+        }};
+
+        var forum = app.resource('forum', actions);
+        forum.load(Forum.get);
+
+        request(app)
+        .get('/forum/12')
+        .expect('Ferrets', done);
+      })
+
+      it('should work recursively', function(done){
+        var app = express();
+        var Forum = require('./fixtures/forum').Forum;
+        var Thread = require('./fixtures/thread').Thread;
+      
+        var actions = { show: function(req, res){
+          res.end(req.forum.title + ': ' + req.thread.title);
+        }};
+      
+        var forum = app.resource('forum', { load: Forum.get });
+        var threads = app.resource('thread', actions, { load: Thread.get });
+      
+        forum.add(threads);
+ 
+        request(app)
+        .get('/forum/12/thread/1')
+        .expect('Ferrets: Tobi rules', done);
+      })
+    })
+  })
 })
\ No newline at end of file