Improve method Profile#full_name

app/models/profile.rb

@@ -2,6 +2,7 @@ class Profile < ApplicationRecord
   has_many :posts
 
   def full_name
-    [first_name, last_name].map(&:presence).compact.join ' '
+    [first_name, last_name].map(&:presence).compact.join(' ').presence ||
+      "Profile#{" ##{id}" if id.present?}"
   end
 end