Fixes #1230. Makes comment counter more efficient

db/migrate/20170316042351_add_comment_count_to_events.rb

@@ -0,0 +1,15 @@
+class AddCommentCountToEvents < ActiveRecord::Migration
+  def up
+    add_column :events, :comments_count, :integer, default: 0
+
+    Event.reset_column_information
+
+    Event.find_each do |event|
+      event.update_attribute :comments_count, event.comment_threads.length
+    end
+  end
+
+  def down
+    remove_column :events, :comments_count
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170213145807) do
+ActiveRecord::Schema.define(version: 20170316042351) do
 
   create_table "ahoy_events", force: :cascade do |t|
     t.uuid     "visit_id",   limit: 16
@@ -234,6 +234,7 @@ ActiveRecord::Schema.define(version: 20170213145807) do
     t.boolean  "is_highlight",                 default: false
     t.integer  "program_id"
     t.integer  "max_attendees"
+    t.integer  "comments_count",               default: 0
   end
 
   create_table "events_registrations", force: :cascade do |t|