Use template_name instead of action_name for notification mails

This is a new feature in rails 6

app/mailers/notification_mailers/base.rb

@@ -40,7 +40,8 @@ module NotificationMailers
 
       {
         from:          name_and_address(from_name, AppConfig.mail.sender_address),
-        to:   name_and_address(@recipient.name, @recipient.email)
+        to:            name_and_address(@recipient.name, @recipient.email),
+        template_name: self.class.name.demodulize.underscore
       }
     end
 

app/mailers/notifier.rb

@@ -51,14 +51,10 @@ class Notifier < ApplicationMailer
   end
 
   def send_notification(type, *args)
-    @notification = NotificationMailers.const_get(type.to_s.camelize).new(*args)
+    @notification = NotificationMailers.const_get(type.camelize).new(*args)
 
     with_recipient_locale do
-      self.action_name = type
-      mail(@notification.headers) do |format|
-        format.text
-        format.html
-      end
+      mail(@notification.headers)
     end
   end
 

app/workers/mail/notifier_base.rb

@@ -6,7 +6,7 @@ module Workers
       sidekiq_options queue: :low
 
       def perform(*args)
-        Notifier.send_notification(self.class.name.gsub("Workers::Mail::", "").underscore, *args).deliver_now
+        Notifier.send_notification(self.class.name.demodulize.underscore, *args).deliver_now
       end
     end
   end