use more specific names than user

author and recipient are matching the domain they are employed in (mail delivery) closer.

Especially the name 'current_user' only happens to be the thing being assigned as author,
but does not transport any special meaning in itself.

app/workers/deliver_work_package_created_job.rb

@@ -30,27 +30,27 @@
 class DeliverWorkPackageCreatedJob
   include MailNotificationJob
 
-  def initialize(user_id, work_package_id, current_user_id)
-    @user_id         = user_id
+  def initialize(recipient_id, work_package_id, author_id)
+    @recipient_id    = recipient_id
     @work_package_id = work_package_id
-    @current_user_id = current_user_id
+    @author_id       = author_id
   end
 
   private
 
   def notification_mail
-    @notification_mail ||= UserMailer.work_package_added(user, work_package, current_user)
+    @notification_mail ||= UserMailer.work_package_added(recipient, work_package, author)
   end
 
-  def user
-    @user ||= Principal.find(@user_id)
+  def recipient
+    @recipient ||= Principal.find(@recipient_id)
   end
 
   def work_package
     @work_package ||= WorkPackage.find(@work_package_id)
   end
 
-  def current_user
-    @current_user ||= Principal.find(@current_user_id)
+  def author
+    @author ||= Principal.find(@author_id)
   end
 end

app/workers/deliver_work_package_updated_job.rb

@@ -30,27 +30,27 @@
 class DeliverWorkPackageUpdatedJob
   include MailNotificationJob
 
-  def initialize(user_id, journal_id, current_user_id)
-    @user_id         = user_id
-    @journal_id      = journal_id
-    @current_user_id = current_user_id
+  def initialize(recipient_id, journal_id, author_id)
+    @recipient_id = recipient_id
+    @journal_id   = journal_id
+    @author_id    = author_id
   end
 
   private
 
   def notification_mail
-    @notification_mail ||= UserMailer.work_package_updated(user, journal, current_user)
+    @notification_mail ||= UserMailer.work_package_updated(recipient, journal, author)
   end
 
-  def user
-    @user ||= Principal.find(@user_id)
+  def recipient
+    @recipient ||= Principal.find(@recipient_id)
   end
 
   def journal
     @journal ||= Journal.find(@journal_id)
   end
 
-  def current_user
-    @current_user ||= Principal.find(@current_user_id)
+  def author
+    @author ||= Principal.find(@author_id)
   end
 end