theforeman/foreman-docker

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app/views/foreman_docker/common_parameters/_dns_entry.html.erb

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<tr class="fields form-group <%= 'has-error' if f.object.errors.any? %>">
  <td><%= f.text_field(:key,  :class => "form-control",
                       :placeholder => _("DNS e.g. 8.8.8.8")) %></td>
  <td style='vertical-align: middle' class='text-center'>
    <span class="help-block">
      <%= link_to_remove_fields('', f) %>
    </span>
  </td>
  <span class="help-block">
    <%= f.object.errors.full_messages.to_sentence %>
  </span>
</tr>