FIX: PostOwnerChange should update 'topic.last_poser'

app/services/post_owner_changer.rb

@@ -12,21 +12,22 @@ class PostOwnerChanger
 
   def change_owner!
     @post_ids.each do |post_id|
-      post = Post.with_deleted.where(id: post_id, topic_id: @topic.id).first
-      next if post.blank?
-      @topic.user = @new_owner if post.is_first_post?
+      next unless post = Post.with_deleted.find_by(id: post_id, topic_id: @topic.id)
 
-      if post.user == nil
-        @topic.recover! if post.is_first_post?
+      if post.is_first_post?
+        @topic.user = @new_owner
+        @topic.recover! if post.user.nil?
       end
+
       post.topic = @topic
       post.set_owner(@new_owner, @acting_user, @skip_revision)
       PostAction.remove_act(@new_owner, post, PostActionType.types[:like])
 
-      if post.post_number == 1
-        TopicUser.change(@new_owner.id, @topic.id, notification_level: NotificationLevels.topic_levels[:watching])
-      else
-        TopicUser.change(@new_owner.id, @topic.id, notification_level: NotificationLevels.topic_levels[:tracking])
+      level = post.is_first_post? ? :watching : :tracking
+      TopicUser.change(@new_owner.id, @topic.id, notification_level: NotificationLevels.topic_levels[level])
+
+      if post == @topic.posts.order("post_number DESC").where("NOT hidden AND posts.deleted_at IS NULL").first
+        @topic.last_poster = @new_owner
       end
 
       @topic.update_statistics