Update namespace if user changed username. Dont move project if new record

app/observers/project_observer.rb

 class ProjectObserver < ActiveRecord::Observer
   def before_save(project)
     # Move repository if namespace changed
-    if project.namespace_id_changed?
+    if project.namespace_id_changed? and not project.new_record?
       move_project(project)
     end
   end

app/observers/user_observer.rb

@@ -9,6 +9,12 @@ class UserObserver < ActiveRecord::Observer
     log_info("User \"#{user.name}\" (#{user.email})  was removed")
   end
+  def after_save user
+    if user.username_changed?
+      user.namespace.update_attributes(code: user.username)
+    end
+  end
+
   protected
   def log_info message