Add task to generate poll slugs

lib/tasks/polls.rake

@@ -0,0 +1,8 @@
+namespace :poll do
+  desc "Generate slugs polls"
+  task generate_slugs: :environment do
+    Poll.find_each do |poll|
+      poll.update_columns(slug: poll.generate_slug, updated_at: Time.current) if poll.generate_slug?
+    end
+  end
+end