app/views/blog/shared/_categories.html.erb


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<h2><%= t('.title') %></h2>
<ul id='categories'>
  <% @blog_categories.each do |category| %>
    <li<%= " class='selected'" if @category.present? and @category.id == category.id %>>
      <%= link_to "#{category.title} (#{category.posts.count})", blog_category_url(category) %>
    </li>
  <% end %>
</ul>