diff --git a/lib/cancan/controller_resource.rb b/lib/cancan/controller_resource.rb
index 1d6a3e0..355ebb6 100644
--- a/lib/cancan/controller_resource.rb
+++ b/lib/cancan/controller_resource.rb
@@ -145,7 +145,7 @@ module CanCan
     def resource_class
       case @options[:class]
       when false  then name.to_sym
-      when nil    then (@name || namespaced_name).to_s.camelize.constantize
+      when nil    then namespaced_name.to_s.camelize.constantize
       when String then @options[:class].constantize
       else @options[:class]
       end
@@ -230,7 +230,7 @@ module CanCan
     end
 
     def namespaced_name
-      @params[:controller].sub("Controller", "").singularize.camelize.constantize
+      (@name || @params[:controller].sub("Controller", "")).singularize.camelize.constantize
     rescue NameError
       name
     end
diff --git a/spec/cancan/controller_resource_spec.rb b/spec/cancan/controller_resource_spec.rb
index 5a2981e..e37e9ec 100644
--- a/spec/cancan/controller_resource_spec.rb
+++ b/spec/cancan/controller_resource_spec.rb
@@ -235,6 +235,18 @@ describe CanCan::ControllerResource do
     project = @controller.instance_variable_get(:@project)
     project.category.should eq(category)
   end
+  
+  it "parent resources shouldn't be altered" do
+    category = Category.create!
+    @params.merge!(:action => "create", :category_id => category.id, :project => { :name => 'foo' })
+    
+    CanCan::ControllerResource.new(@controller, :category, :load => true).process
+    CanCan::ControllerResource.new(@controller, :project, :load => true, :through => :category).process
+    
+    project = @controller.instance_variable_get(:@project)
+    project.new_record?.should eq(true)
+    project.name.should eq('foo')
+  end
 
   it "authorizes nested resource through parent association on index action" do
     pending