Added toggling Quantity primary-ness

config/locales/en.yml

@@ -10,6 +10,7 @@ en:
   field_domain: 'Domain'
   field_parent_quantity: 'Parent'
   field_shortname: 'Short name'
+  button_toggle: 'Toggle'
   activerecord:
     errors:
       models:

config/routes.rb

@@ -11,7 +11,9 @@ resources :projects do
       get 'nutrients', on: :collection
     end
     resources :sources, :only => [:index, :create, :destroy]
-    resources :quantities, :only => [:index, :create, :destroy]
+    resources :quantities, :only => [:index, :create, :destroy] do
+      post 'toggle', on: :member
+    end
     resources :units, :only => [:index, :create, :destroy]
   end
 end