Allowing :nested option to accept an array for deep nesting

lib/cancan/controller_additions.rb

@@ -41,6 +41,10 @@ module CanCan
       #   
       #     load_resource :nested => :author
       #   
+      #   Deep nesting can be defined in an array.
+      #   
+      #     load_resource :nested => [:publisher, :author]
+      #   
       # [:+collection+]
       #   Specify which actions are resource collection actions in addition to :+index+. This
       #   is usually not necessary because it will try to guess depending on if an :+id+

lib/cancan/resource_authorization.rb

@@ -34,11 +34,12 @@ module CanCan
     end
     
     def parent_resource
-      if @options[:nested]
-        parent = ControllerResource.new(@controller, @options[:nested])
-        parent.find(@params["#{@options[:nested]}_id".to_sym])
-        parent
+      parent = nil
+      [@options[:nested]].flatten.compact.each do |name|
+        parent = ControllerResource.new(@controller, name, parent)
+        parent.find(@params["#{name}_id".to_sym])
       end
+      parent
     end
     
     def model_name