Fix pull request 1

app/views/layouts/_navigation_links.html.slim

-- if current_user.present?
+- if policy(:product).new?
   li
     = link_to "New product", new_product_path
 

lib/tasks/crawler.rake

@@ -20,7 +20,10 @@ namespace :crawler do
         items.each do |item|
           break if category.products.count >= 20 # limit 20 products each category
           param_item = VacuumAwsService.parse_item(item)
-          category.products.create(param_item) if param_item.present? && category.products.where(pid: param_item[:pid], title: param_item[:title]).limit(1).blank?
+          if param_item.present? && category.products.where(pid: param_item[:pid], title: param_item[:title]).limit(1).blank? &&
+           category.products.find_by(title: param_item["title"]).blank?
+            category.products.create(param_item)
+          end
         end
       end
     end