Fix unknown user variable after deletion

.vscode/settings.json

@@ -107,6 +107,7 @@
         "factorybot",
         "helpdesk",
         "katex",
-        "turbolinks"
+        "turbolinks",
+        "Unsets"
     ]
 }

app/mailers/user_cleaner_mailer.rb

@@ -5,24 +5,22 @@ class UserCleanerMailer < ApplicationMailer
   #
   # @param [Integer] num_days_until_deletion:
   #  The number of days until the account will be deleted.
-  def pending_deletion_email(num_days_until_deletion)
-    user = params[:user]
+  def pending_deletion_email(user_email, user_locale, num_days_until_deletion)
     sender = "#{t("mailer.warning")} <#{DefaultSetting::PROJECT_EMAIL}>"
-    I18n.locale = user.locale
+    I18n.locale = user_locale
 
     @num_days_until_deletion = num_days_until_deletion
     subject = t("mailer.pending_deletion_subject",
                 num_days_until_deletion: @num_days_until_deletion)
-    mail(from: sender, to: user.email, subject: subject, priority: "high")
+    mail(from: sender, to: user_email, subject: subject, priority: "high")
   end
 
   # Creates an email to inform a user that their account has been deleted.
-  def deletion_email
-    user = params[:user]
+  def deletion_email(user_email, user_locale)
     sender = "#{t("mailer.warning")} <#{DefaultSetting::PROJECT_EMAIL}>"
-    I18n.locale = user.locale
+    I18n.locale = user_locale
 
     subject = t("mailer.deletion_subject")
-    mail(from: sender, to: user.email, subject: subject, priority: "high")
+    mail(from: sender, to: user_email, subject: subject, priority: "high")
   end
 end

app/models/user_cleaner.rb

@@ -76,8 +76,9 @@ def set_deletion_date_for_inactive_users
                   .find_each do |user|
       user.update(deletion_date: Date.current + 40.days)
 
-      if user.generic? # rubocop:disable Style/IfUnlessModifier
-        UserCleanerMailer.with(user: user).pending_deletion_email(40).deliver_later
+      if user.generic?
+        UserCleanerMailer.pending_deletion_email(user.email, user.locale, 40)
+                         .deliver_later
       end
     end
   end
@@ -114,7 +115,7 @@ def delete_users_according_to_deletion_date!
     User.where(deletion_date: ..Date.current).find_each do |user|
       next unless user.generic?
 
-      UserCleanerMailer.with(user: user).deletion_email.deliver_later
+      UserCleanerMailer.deletion_email(user.email, user.locale).deliver_later
       user.destroy
       num_deleted_users += 1
     end