index.html.erb

#/views/products/index.html.erb

<div class="hide-for-small panel">
  <h3>Sidebar</h3>
  <h5 class="subheader">Feature Product</h5>
    <% Product.random do |product|%>
      <%= image_tag(Product.image_url) %> 
      <h5><%= link_to Product.title, product %></h5>
      <p><%= button_to 'Add to Cart', line_items_path(:product_id => product) %></p>
    <% end %>               
</div>

products.rb

#/models/products.rb


class Product < ActiveRecord::Base 
 
  def Product.random
    find.limit(1).offset(rand(self.count)).first
  end

end