user - show.html.erb

<% provide(:title, @user.name) %>
<div class="row">
  <aside class="col-md-4">
    <section class="user_info">
      <h1>
        <%= gravatar_for @user %>
        <%= @user.name %><br>
      </h1>
    </section>
  </aside>
  <div class="collectionList">
        <% @user.collections.each do |d| %>
        <div class="collectionSample">
          <strong><%= link_to d.name, {:controller => "collections", :action => "show", :id => d.id } %></strong><br />
          Distinct Cards: <%= d.card_collections.count %> <br />
          Total Cards: 
            <% d.card_collections.each do |x| %>
            <% y = [] %>
            <% y << x.card_counts %>
            <% y.flatten! %>
            <% y = y.inject(0){|sum,x| sum + x } %>
            <%= y %>
            <% end %>
          <% if d.public %> Public <% end %><br />
        </div>
        <% end %>
      </div>
</div>

Total Cards: <%= d.card_collections.sum(:card_counts) %>