diff --git a/lib/cancan/controller_resource.rb b/lib/cancan/controller_resource.rb
index b417d5c6..8bd09df4 100644
--- a/lib/cancan/controller_resource.rb
+++ b/lib/cancan/controller_resource.rb
@@ -143,6 +143,7 @@ def resource_class
       when false  then name.to_sym
       when nil    then namespaced_name.to_s.camelize.constantize
       when String then @options[:class].constantize
+      when Proc   then klass = @options[:class].call(@controller); klass.is_a?(String) ? klass.constantize : klass
       else @options[:class]
       end
     end
@@ -212,8 +213,13 @@ def name
 
     def namespaced_name
       @name || @params[:controller].sub("Controller", "").singularize.camelize.constantize
-    rescue NameError
-      name
+    rescue Exception => e
+      #Object is not missing Constant means we actually do have that model, un-namespaced
+      if [NameError,ArgumentError].include?(e.class)
+        name
+      else
+        raise e
+      end
     end
 
     def name_from_controller
diff --git a/spec/cancan/controller_resource_spec.rb b/spec/cancan/controller_resource_spec.rb
index c89480c9..1c7c3e1d 100644
--- a/spec/cancan/controller_resource_spec.rb
+++ b/spec/cancan/controller_resource_spec.rb
@@ -332,6 +332,22 @@ class Project < ::Project; end
     @controller.instance_variable_get(:@project).should == project
   end
 
+  it "should load the model using a custom class that is a proced constant" do
+    project = Project.create!
+    @params.merge!(:action => "show", :id => project.id)
+    resource = CanCan::ControllerResource.new(@controller, :class => lambda{ Project })
+    resource.load_resource
+    @controller.instance_variable_get(:@project).should == project
+  end
+
+  it "should load the model using a custom class that is a proced string" do
+    project = Project.create!
+    @params.merge!(:action => "show", :id => project.id)
+    resource = CanCan::ControllerResource.new(@controller, :class => lambda{ "Project" })
+    resource.load_resource
+    @controller.instance_variable_get(:@project).should == project
+  end
+
   it "should load the model using a custom namespaced class" do
     project = Sub::Project.create!
     @params.merge!(:action => "show", :id => project.id)