adbanner-test/app/views/admin/ad_banners/_index_table.html.erb

<% content_for :page_specific_css do %>
<style type="text/css">
  .slide-img{
    width: 100%;
    height: 140px;
    background-repeat: no-repeat;
  }
</style>
<% end %>
<table class="table main-list">
  <thead>
    <tr class="sort-header">
      <% @table_fields.each do |f| %>
      <%= thead(f) %>
      <% end %>
    </tr>
  </thead>
  <tbody>
  <% user_has_rights = (current_user.is_admin? ? true : (current_user.is_manager?(@module_app) ? true : current_user.is_manager_with_role?(@module_app) ? true : false)) rescue false %>
  <% @banners.each do |banner| %>
    <tr>
      <td class="span5">
        <div class="cycle-slideshow ad-banner-images "
            data-cycle-slides=".slide-img"
            data-cycle-fx="<%= banner.ad_fx %>"
            data-cycle-speed="<%= banner.speed %>"
            data-cycle-timeout="<%= banner.timeout.to_i*1000 %>"
            >
          <% if !banner.ad_images.can_display.blank? %>
            <% 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.video_snapshot.present? %>
                <div class="slide-img" style=" background: url('<%= image.video_snapshot %>'); background-size: cover; background-position: center;"></div>
              <% elsif image.exchange_item == '2' %>
                <div class="slide-img" style=" background: url('<%= image.youtube_thumb %>'); background-size: cover; background-position: center;"></div>
              <% end %>
            <% end %>
          <% else %>
            <%
              width = banner.width
              height = banner.height
              width = 200 if width.blank?
              height = 80 if height.blank?
            %>
            <div class="slide-img" style="background: url('https://via.placeholder.com/<%= width %>x<%= height %>/888&text=A'); background-size: cover; background-position: center;"></div>
            <div class="slide-img" style="background: url('https://via.placeholder.com/<%= width %>x<%= height %>/666&text=B'); background-size: cover; background-position: center;"></div>
          <% end %>

        </div>
      </td>
      <td>
        <a href="<%= admin_ad_banner_path(banner.id) %>"><%= banner.title rescue "" %> </a>
        <div class="quick-edit">
            <ul class="nav nav-pills">
              <% if can_edit_or_delete?(banner) %>
                  <li><a href="<%= admin_ad_banner_path(banner.id) %>"><%= t("ad_banner.add") %></a></li>
              <% end %>
              <% if user_has_rights %>
                <li><a href="<%= edit_admin_ad_banner_path(banner.id, :page => params[:page]) %>"><%= t(:edit) %></a></li>
                <li><a href="<%= admin_ad_banner_path(banner.id, :page => params[:page]) %>" class="delete text-error" data-method="delete" data-confirm="Are you sure?" ><%= t(:delete_) %></a></li>
              <% end %>
            </ul>
          </div>
      </td>
      <td>
        <%= banner.category.title rescue "" %>
      </td>
    </tr>
  <% end %>
  </tbody>
  </table>
  <div class="bottomnav clearfix" style="left: 81px;">
<% if user_has_rights %>
  <div class="action pull-right">
    <a class="btn btn-primary" href="<%= new_admin_ad_banner_path %>">
      <%= t("ad_banner.new_banner") %>
    </a>
  </div>
<% end %>
   <%= content_tag :div, paginate(@banners), class: "pagination pagination-centered" %>
</div>