Added Quantity nesting with awesome_nested_set

app/controllers/quantities_controller.rb

@@ -5,7 +5,6 @@ class QuantitiesController < ApplicationController
 
   def index
     @quantity = Quantity.new
-    @quantities = @project.quantities
   end
 
   def create
@@ -14,7 +13,6 @@ class QuantitiesController < ApplicationController
       flash[:notice] = 'Created new quantity'
       redirect_to project_quantities_url(@project)
     else
-      @quantities = @project.quantities
       render :index
     end
   end
@@ -32,7 +30,8 @@ class QuantitiesController < ApplicationController
     params.require(:quantity).permit(
       :name,
       :description,
-      :domain
+      :domain,
+      :parent_id
     )
   end