app/views/talks/_talk.html.erb
<% cache(talk) do %>
<li class="talks-list__talk group">
<div class="speaker-avatar"><%= gravatar_image_tag talk.speaker.email, :gravatar => { :size => 220 }, alt: talk.speaker.name %></div>
<div class="talks-list__talk__info">
<span class="is-smooth-text"><strong><%= l talk.horary, :format => :talk %></strong> na <%= talk.room.name %> com <strong><%= talk.speaker.name %></strong></span>
<br>
<strong class="talks-list__talk__title"><%= talk.name %></strong>
<p class="talks-list__talk__subtitle"><%= talk.description %></p>
</div>
</li>
<% end %>