<div class="tools pull-right">
  <%= topic_follow_tag(@topic) %>
  <%= likeable_tag(@topic) %>
  <%= topic_favorite_tag(@topic) %>
  <% if owner?(@topic) or admin? %>
    <%= link_to "", edit_topic_path(@topic), :class => "icon small_edit", :title => "修改本帖" %>
    <%= link_to "", topic_path(@topic.id), :method => :delete, 'data-confirm' => t("common.confirm_delete"), :class => "icon small_delete", :title => "删除本帖" %>
  <% end %>
</div>

既然安装了 gem Cancan，上面一段为什么不使用 if can？

实在看不懂，求指点。

<div class="tools pull-right">
  <%= topic_follow_tag(@topic) %>
  <%= likeable_tag(@topic) %>
  <%= topic_favorite_tag(@topic) %>
  <% if can? %>
    <%= link_to "", edit_topic_path(@topic), :class => "icon small_edit", :title => "修改本帖" %>
    <%= link_to "", topic_path(@topic.id), :method => :delete, 'data-confirm' => t("common.confirm_delete"), :class => "icon small_delete", :title => "删除本帖" %>
  <% end %>
</div>