FIX: ensure PostAlerter is always run in sidekiq

app/jobs/regular/notify_category_change.rb

@@ -0,0 +1,15 @@
+require_dependency "post_alerter"
+
+module Jobs
+  class NotifyCategoryChange < Jobs::Base
+    def execute(args)
+      post = Post.find_by(id: args[:post_id])
+
+      if post&.topic
+        post_alerter = PostAlerter.new
+        post_alerter.notify_post_users(post, User.where(id: args[:notified_user_ids]))
+        post_alerter.notify_first_post_watchers(post, post_alerter.category_watchers(post.topic))
+      end
+    end
+  end
+end

app/jobs/regular/post_alert.rb

@@ -4,9 +4,12 @@ module Jobs
   class PostAlert < Jobs::Base
 
     def execute(args)
-      # maybe it was removed by the time we are making the post
-      post = Post.where(id: args[:post_id]).first
-      PostAlerter.post_created(post, args[:options] || {}) if post && post.topic
+      post = Post.find_by(id: args[:post_id])
+      if post&.topic
+        opts = args[:options] || {}
+        new_record = true == args[:new_record]
+        PostAlerter.new(opts).after_save_post(post, new_record)
+      end
     end
 
   end

app/models/topic.rb

@@ -675,19 +675,9 @@ SQL
         CategoryUser.auto_watch(category_id: new_category.id, topic_id: self.id)
         CategoryUser.auto_track(category_id: new_category.id, topic_id: self.id)
 
-        post = self.ordered_posts.first
-
-        if post
-          post_alerter = PostAlerter.new
-
-          post_alerter.notify_post_users(
-            post,
-            [post.user, post.last_editor].uniq
-          )
-
-          post_alerter.notify_first_post_watchers(
-            post, post_alerter.category_watchers(self)
-          )
+        if post = self.ordered_posts.first
+          notified_user_ids = [post.user_id, post.last_editor_id].uniq
+          Jobs.enqueue(:notify_category_change, post_id: post.id, notified_user_ids: notified_user_ids)
         end
       end
 
@@ -788,8 +778,7 @@ SQL
 
     last_post = posts.order('post_number desc').where('not hidden AND posts.deleted_at IS NULL').first
     if last_post
-      # ensure all the notifications are out
-      PostAlerter.new.after_save_post(last_post)
+      Jobs.enqueue(:post_alert, post_id: last_post.id)
       add_small_action(user, "invited_group", group.name)
 
       group_id = group.id

app/services/post_action_notifier.rb

@@ -41,7 +41,6 @@ class PostActionNotifier
   end
 
   def self.post_action_deleted(post_action)
-
     return if @disabled
 
     # We only care about deleting post actions for now
@@ -69,7 +68,6 @@ class PostActionNotifier
   end
 
   def self.post_action_created(post_action)
-
     return if @disabled
 
     # We only notify on likes for now
@@ -89,7 +87,6 @@ class PostActionNotifier
   end
 
   def self.after_create_post_revision(post_revision)
-
     return if @disabled
 
     post = post_revision.post

app/services/post_alerter.rb

@@ -134,13 +134,11 @@ class PostAlerter
     user_ids -= [post.user_id]
     users = User.where(id: user_ids)
 
-    Scheduler::Defer.later("Notify First Post Watchers") do
     DiscourseEvent.trigger(:before_create_notifications_for_users, users, post)
     users.each do |user|
       create_notification(user, Notification.types[:watching_first_post], post)
     end
   end
-  end
 
   def sync_group_mentions(post, mentioned_groups)
     GroupMention.where(post_id: post.id).destroy_all
@@ -406,6 +404,7 @@ class PostAlerter
         DiscourseEvent.trigger(:post_notification_alert, user, payload)
       end
     end
+
     created.id ? created : nil
   end
 
@@ -486,12 +485,10 @@ class PostAlerter
     users = [users] unless users.is_a?(Array)
     users = users.reject { |u| u.staged? } if post.topic&.private_message?
 
-    Scheduler::Defer.later("Notify Users") do
     DiscourseEvent.trigger(:before_create_notifications_for_users, users, post)
     users.each do |u|
       create_notification(u, Notification.types[type], post, opts)
     end
-    end
 
     users
   end
@@ -499,7 +496,6 @@ class PostAlerter
   def notify_pm_users(post, reply_to_user, notified)
     return unless post.topic
 
-    Scheduler::Defer.later("Notify PM Users") do
     # users that aren't part of any mentioned groups
     users = directly_targeted_users(post).reject { |u| notified.include?(u) }
     DiscourseEvent.trigger(:before_create_notifications_for_users, users, post)
@@ -523,7 +519,6 @@ class PostAlerter
       end
     end
   end
-  end
 
   def notify_post_users(post, notified)
     return unless post.topic
@@ -575,13 +570,11 @@ class PostAlerter
     exclude_user_ids = notified.map(&:id)
     notify = notify.where("id NOT IN (?)", exclude_user_ids) if exclude_user_ids.present?
 
-    Scheduler::Defer.later("Notify Post Users") do
     DiscourseEvent.trigger(:before_create_notifications_for_users, notify, post)
     notify.pluck(:id).each do |user_id|
       user = User.find_by(id: user_id)
       create_notification(user, Notification.types[:posted], post)
     end
   end
-  end
 
 end

lib/post_jobs_enqueuer.rb

@@ -26,7 +26,11 @@ class PostJobsEnqueuer
   private
 
   def enqueue_post_alerts
-    Jobs.enqueue(:post_alert, post_id: @post.id, options: @opts[:post_alert_options])
+    Jobs.enqueue(:post_alert,
+      post_id: @post.id,
+      new_record: true,
+      options: @opts[:post_alert_options],
+  )
   end
 
   def feature_topic_users

lib/post_revisor.rb

@@ -577,7 +577,7 @@ class PostRevisor
 
   def alert_users
     return if @editor.id == Discourse::SYSTEM_USER_ID
-    PostAlerter.new.after_save_post(@post)
+    Jobs.enqueue(:post_alert, post_id: @post.id)
   end
 
   def publish_changes