FIX: suppress notification flood when post is edited (#8838)

app/services/post_alerter.rb

@@ -248,8 +248,8 @@ class PostAlerter
     # TODO decide if it makes sense to also publish a desktop notification
   end
 
-  def should_notify_edit?(notification, opts)
-    notification.data_hash["display_username"] != opts[:display_username]
+  def should_notify_edit?(notification, post, opts)
+    notification.data_hash["display_username"] != (opts[:display_username].presence || post.user.username)
   end
 
   def should_notify_like?(user, notification)
@@ -258,9 +258,9 @@ class PostAlerter
     false
   end
 
-  def should_notify_previous?(user, notification, opts)
+  def should_notify_previous?(user, post, notification, opts)
     case notification.notification_type
-    when Notification.types[:edited] then should_notify_edit?(notification, opts)
+    when Notification.types[:edited] then should_notify_edit?(notification, post, opts)
     when Notification.types[:liked]  then should_notify_like?(user, notification)
     else false
     end
@@ -328,7 +328,7 @@ class PostAlerter
     # Don't notify the same user about the same type of notification on the same post
     existing_notification_of_same_type = existing_notifications.find { |n| n.notification_type == type }
 
-    return if existing_notification_of_same_type && !should_notify_previous?(user, existing_notification_of_same_type, opts)
+    return if existing_notification_of_same_type && !should_notify_previous?(user, post, existing_notification_of_same_type, opts)
 
     notification_data = {}
 

spec/services/post_alerter_spec.rb

@@ -1095,4 +1095,19 @@ describe PostAlerter do
       end
     end
   end
+
+  describe '#notify_post_users' do
+    fab!(:topic) { Fabricate(:topic) }
+    fab!(:post) { Fabricate(:post, topic: topic) }
+
+    it 'creates single edit notification when post is modified' do
+      TopicUser.create!(user_id: user.id, topic_id: topic.id, notification_level: TopicUser.notification_levels[:watching], highest_seen_post_number: post.post_number)
+      PostAlerter.new.notify_post_users(post, [])
+      expect(Notification.count).to eq(1)
+      expect(Notification.last.notification_type).to eq(Notification.types[:edited])
+
+      PostAlerter.new.notify_post_users(post, [])
+      expect(Notification.count).to eq(1)
+    end
+  end
 end