FEATURE: update likes and flags live.

app/assets/javascripts/discourse/controllers/topic_controller.js

@@ -361,7 +361,9 @@ Discourse.TopicController = Discourse.ObjectController.extend(Discourse.Selected
       }
 
       var postStream = topicController.get('postStream');
-      if (data.type === "revised"){
+      if (data.type === "revised" || data.type === "acted"){
+        // TODO we could update less data for "acted"
+        // (only post actions)
         postStream.triggerChangedPost(data.id, data.updated_at);
         return;
       }

app/controllers/posts_controller.rb

@@ -212,6 +212,10 @@ def find_post_revision_from_params
   def render_post_json(post)
     post_serializer = PostSerializer.new(post, scope: guardian, root: false)
     post_serializer.add_raw = true
+    counts = PostAction.counts_for([post], current_user)
+    if counts && counts = counts[post.id]
+      post_serializer.post_actions = counts
+    end
     render_json_dump(post_serializer)
   end
 

app/models/post_action.rb

@@ -20,6 +20,7 @@ class AlreadyActed < StandardError; end
 
   after_save :update_counters
   after_save :enforce_rules
+  after_save :notify_subscribers
 
   def self.update_flagged_posts_count
     posts_flagged_count = PostAction.joins(post: :topic)
@@ -136,6 +137,7 @@ def self.act(user, post, post_action_type_id, opts={})
             staff_took_action: opts[:take_action] || false,
             related_post_id: related_post_id,
             targets_topic: !!targets_topic )
+
   rescue ActiveRecord::RecordNotUnique
     # can happen despite being .create
     # since already bookmarked
@@ -259,6 +261,18 @@ def enforce_rules
     SpamRulesEnforcer.enforce!(post.user) if post_action_type_key == :spam
   end
 
+  def notify_subscribers
+    if (is_like? || is_flag?) && post
+      MessageBus.publish("/topic/#{post.topic_id}",{
+                      id: post.id,
+                      post_number: post.post_number,
+                      type: "acted"
+                    },
+                    group_ids: post.topic.secure_group_ids
+      )
+    end
+  end
+
   def self.auto_hide_if_needed(post, post_action_type)
     return if post.hidden