app/views/events/edit.erb
<div class="well">
<form class="centered" method="post" action='/events/<%= @event.id %>/update'>
<%= csrf_token_field %>
<h1>Detalles del evento</h1>
<input type="text" id="event[name]" name="event[name]" placeholder="nombre del evento" class="large" value="<%= @event.name %>"/>
<input type="text" id="event[date]" name="event[date]" placeholder="fecha:aaaa-mm-dd" value="<%= render_date(@event.date) %>" />
<input type="submit" class="btn big" id="saveButton" value="Guardar" />
<% if flash[:error] %>
<div class="alert alert-error">
<%=flash[:error] %>
</div>
<% end %>
<br/>
<div class="">
<p>Link corto: <%= @event.short_url %> </p>
</div>
</form>
</div>