Use a method for after_initialize rather than a block

app/models/miq_worker.rb

@@ -5,7 +5,8 @@ class MiqWorker < ApplicationRecord
   include SystemdCommon
   include UuidMixin
 
-  before_destroy :error_out_tasks_with_active_queue_message, :log_destroy_of_worker_messages
+  after_initialize :set_system_uid
+  before_destroy   :error_out_tasks_with_active_queue_message, :log_destroy_of_worker_messages
 
   belongs_to :miq_server
   has_many   :messages,           :as => :handler, :class_name => 'MiqQueue'
@@ -40,10 +41,6 @@ class MiqWorker < ApplicationRecord
 
   PROCESS_TITLE_PREFIX = "MIQ:".freeze
 
-  after_initialize do |worker|
-    worker.system_uid = worker.unit_name if worker.systemd_worker?
-  end
-
   def self.atShutdown
     stop_workers
   end
@@ -487,6 +484,10 @@ def clean_active_messages
     end
   end
 
+  private def set_system_uid
+    self.system_uid = unit_name if systemd_worker?
+  end
+
   private def error_out_tasks_with_active_queue_message
     message = "Task Handler: [#{friendly_name}] ID [#{id}] has been deleted!"
     processed_messages.includes(:miq_task).where.not(:miq_task_id => nil).each do |m|