sort added on created at desc

app/controllers/ad_banners_controller.rb

@@ -13,7 +13,7 @@ class AdBannersController < ApplicationController
 
   def image_widget(adbanner)
       images = []
-      adbanner.ad_images.can_display.each_with_index do |b,i|
+      adbanner.ad_images.can_display.desc(:created_at).each_with_index do |b,i|
         if b.language_enabled.include?(I18n.locale.to_s)
           image_link = OrbitHelper.is_mobile_view ? b.file.mobile.url : b.file.url
           klass = i == 0 ? "active" : ""

app/views/admin/ad_banners/_index.html.erb

@@ -240,7 +240,7 @@
         data-cycle-timeout="5000"
         >
         <% if !banner.ad_images.can_display.blank? %>
-          <% banner.ad_images.can_display.each do |image| %>
+          <% banner.ad_images.can_display.desc(:created_at).each do |image| %>
             <% if image.exchange_item == '1' %>
               <div class="slide-img" style=" background: url('<%= image.file.thumb.url %>'); background-size: cover; background-position: center;"></div>
             <% elsif image.exchange_item == '2' %>
@@ -300,7 +300,7 @@
           <a href="<%= new_admin_ad_image_path(banner: banner.id.to_s) %>" class="ad-image-new-btn">
           <i class="icon-plus"></i> <%= t("new_image") %>
           </a>
-          <% banner.ad_images.each_with_index do |image,idx| %>
+          <% banner.ad_images.desc(:created_at).each_with_index do |image,idx| %>
             <div class="ad-banner-image-wrap">
               <% if image.exchange_item == '1' %>
                 <div class="ad-banner-image <%= image.expired? ? "grayscale" : "" %>" style="background: url('<%= image.file.thumb.url %>'); background-size: cover; background-position: center;">