Improve Rake tasks performance replacing .all.each with .find_each

lib/tasks/slugs.rake

@@ -2,7 +2,7 @@ namespace :slugs do
   desc "Generate slug attribute for objects from classes that use Sluggable concern"
   task generate: :environment do
     %w(Budget Budget::Heading Budget::Group).each do |class_name|
-      class_name.constantize.all.each(&:generate_slug)
+      class_name.constantize.find_each(&:generate_slug)
     end
   end
 end