tap/app/views/users/show.html.erb

<%= render partial: 'flash' %>
<div class="row">
  <%= render 'sidebar' %>
   <div id="user_info" class="col-sm-9">
    <% if (all_orders = @user.all_orders(params[:page])).any? %>
      <h4>Previously ordered</h4>
      Total:
      <ul>
        <li>
        <%= @user.products_group_by_category.map{|c| pluralize(c.count, c.category)}.to_sentence %>
        </li>
      </ul>

      Specifics:
      <%= content_tag :ul do %>
        <% @user.products_group_by_id.each do |p| %>
        <%= content_tag :li, pluralize(p.count, p.name) %>
      <% end %>
    <% end %>

      <h4>All orders (<%= @user.orders_count %>)</h4>
      <table class="orders"><%= render all_orders %></table>
      <%= will_paginate all_orders %>
    </div>
  <% end %>
</div>
</div>