BUGFIX: when RTT is short likes may not appear to work

BUGFIX: site settings db provider not triggering updates
  at the correct point

app/models/post_action.rb

@@ -20,7 +20,7 @@ class PostAction < ActiveRecord::Base
 
   after_save :update_counters
   after_save :enforce_rules
-  after_save :notify_subscribers
+  after_commit :notify_subscribers
 
   def self.update_flagged_posts_count
     posts_flagged_count = PostAction.joins(post: :topic)
@@ -154,7 +154,10 @@ class PostAction < ActiveRecord::Base
 
   def remove_act!(user)
     trash!(user)
-    run_callbacks(:save)
+    # NOTE: save is called to ensure all callbacks are called
+    # trash will not trigger callbacks, and triggering after_commit
+    # is not trivial
+    save
   end
 
   def is_bookmark?

lib/site_setting_extension.rb

@@ -214,8 +214,10 @@ module SiteSettingExtension
     provider.save(name, val, type)
     current[name] = convert(val, type)
     clear_cache!
+  end
 
-    @last_message_sent = MessageBus.publish('/site_settings', {process: process_id})
+  def notify_changed!
+    MessageBus.publish('/site_settings', {process: process_id})
   end
 
   def has_setting?(name)

lib/site_settings/db_provider.rb

@@ -3,6 +3,10 @@ module SiteSettings; end
 class SiteSettings::DbProvider
 
   def initialize(model)
+    model.after_commit do
+      model.notify_changed!
+    end
+
     @model = model
   end
 
@@ -28,18 +32,18 @@ class SiteSettings::DbProvider
 
     return unless table_exists?
 
-    count = @model.where({
+    model = @model.find_by({
       name: name
-    }).update_all({
-      name: name,
-      value: value,
-      data_type: data_type,
-      updated_at: Time.now
     })
 
-    if count == 0
-      @model.create!(name: name, value: value, data_type: data_type)
-    end
+    model ||= @model.new
+
+    model.name = name
+    model.value =  value
+    model.data_type =  data_type
+
+    # save! used to ensure after_commit is called
+    model.save!
 
     true
   end