diff --git a/motion/adapters/array_model_adapter.rb b/motion/adapters/array_model_adapter.rb
index baf0f8e..776db48 100644
--- a/motion/adapters/array_model_adapter.rb
+++ b/motion/adapters/array_model_adapter.rb
@@ -164,6 +164,7 @@ def do_insert(options = {})
     end
 
     def do_update(options = {})
+      true
     end
 
     def do_delete
diff --git a/spec/model_spec.rb b/spec/model_spec.rb
index 1bb8c8c..4169132 100644
--- a/spec/model_spec.rb
+++ b/spec/model_spec.rb
@@ -168,6 +168,12 @@ class TypeCast
       Task.where(:name).eq('updated').should == 0
       lambda{task.save}.should.change{Task.where(:name).eq('updated')}
     end
+
+    it 'should not raise MotionModel::RecordNotSaved when save! is called' do
+      task = Task.create(:name => 'updateable')
+      task.name = 'updated'
+      lambda{task.save!}.should.not.raise(MotionModel::RecordNotSaved)
+    end
   end
 
   describe 'deleting' do