Rails Spree Extension doesn't show instance in view -

the default spree commerce has "categories" , "brand" taxonomies. have generated extension creates custom testing page taxonomies displayed, in reverse order. practicing purposes.

the custom testing page "/testing" seems routing correctly , using view testing.html.erb, can not load taxonomies instance defined in method. gives me undefined method each nil:nilclass.

note: i'm working in extension only, not in spree app.

spree_custom_extension/controllers/spree/home_controller_extension.rb

module spree   homecontroller.class_eval     def testing       @taxonomies = spree::taxonomy.includes(root: :children).reverse_order     end   end end 

spree_custom_extension/views/spree/home/testing.html.erb

<% @taxonomies.each |taxonomy| %>   <%= taxonomy.name %><br> <% end %> 

spree_custom_extension/config/routes.rb

spree::core::engine.routes.draw   '/testing' => 'home#testing' end