diff --git a/lib/rom/session/relation.rb b/lib/rom/session/relation.rb
index 708449a..50627aa 100644
--- a/lib/rom/session/relation.rb
+++ b/lib/rom/session/relation.rb
@@ -19,6 +19,13 @@ def self.build(relation, tracker, identity_map)
         new(relation.inject_mapper(mapper), tracker)
       end
 
+      def new(*args, &block)
+        # FIXME: expose some nice API on the mapper to build new models
+        object = mapper.loader.send(:model).new(*args, &block)
+        track(object)
+        object
+      end
+
       def identity(object)
         dumper.identity(object)
       end
diff --git a/spec/shared/unit/relation_context.rb b/spec/shared/unit/relation_context.rb
index a38750f..8a372e7 100644
--- a/spec/shared/unit/relation_context.rb
+++ b/spec/shared/unit/relation_context.rb
@@ -10,6 +10,5 @@
   let(:relation) { Relation.new(axiom, mapper) }
   let(:users)    { session[:users] }
 
-
   let(:user) { session[:users].all.first }
 end
diff --git a/spec/unit/rom/session/relation/save_spec.rb b/spec/unit/rom/session/relation/save_spec.rb
new file mode 100644
index 0000000..9f85433
--- /dev/null
+++ b/spec/unit/rom/session/relation/save_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe Session::Relation, '#save' do
+  subject { users.save(user).state(user) }
+
+  include_context 'Session::Relation'
+
+  context 'when an object is new' do
+    let(:user) { users.new(:id => 3, :name => 'John') }
+
+    it { should be_created }
+  end
+
+  context 'when an object is persisted' do
+    context 'when not dirty' do
+      it { should be_persisted }
+    end
+
+    context 'when dirty' do
+      before do
+        user.name = 'John Doe'
+      end
+
+      it { should be_updated }
+    end
+  end
+end
diff --git a/spec/unit/rom/session_spec.rb b/spec/unit/rom/session_spec.rb
index a0af372..e3f1ea4 100644
--- a/spec/unit/rom/session_spec.rb
+++ b/spec/unit/rom/session_spec.rb
@@ -13,39 +13,6 @@
 
   let(:object) { env[:users].all.first }
 
-  describe '#save' do
-    context 'when an object is persisted' do
-      context 'when not dirty' do
-        it 'does not queue an object to be updated' do
-          session[:users].save(object)
-
-          expect(session[:users].state(object)).to be_persisted
-        end
-      end
-
-      context 'when dirty' do
-        it 'queues an object to be updated' do
-          object.name = 'John Doe'
-
-          session[:users].save(object)
-
-          expect(session[:users].state(object)).to be_updated
-        end
-      end
-    end
-
-    context 'when an object is new' do
-      it 'queues an object to be created' do
-        user = model.new(:id => 3, :name => 'John')
-
-        session[:users].track(user)
-        session[:users].save(user)
-
-        expect(session[:users].state(user)).to be_created
-      end
-    end
-  end
-
   describe '#delete' do
     it 'queues an object to be deleted' do
       session[:users].delete(object)