feed query optimized

app/controllers/v1/feed_controller.rb

 class V1::FeedController < ApplicationController
   include ::Paginator
+  include ActivitiesFilterService
   before_action :authenticate_user!
 
   # GET v1/feed
@@ -13,11 +14,23 @@ class V1::FeedController < ApplicationController
   private
 
   def activities_followed
-    activities = []
+    query = ""
+    values = [""]
+
     current_user.watching.each do |watching|
-      activities.push(*watching.activities_filtered.to_a)
+        if !watching.respond_to?(:state) || watching.state == "published"
+          query += " (trackable_type = ? and trackable_id = ?) or (owner_type = ? and owner_id = ?) or (recipient_type = ? and recipient_id = ?) or"
+          values << watching.class.to_s
+          values << watching.id
+          values << watching.class.to_s
+          values << watching.id
+          values << watching.class.to_s
+          values << watching.id
+        end
     end
-    activities
+
+    values[0] = query[0..-3]
+    PublicActivity::Activity.where(key: activities_filter).where(values).order(created_at: :desc)
   end
 
 end