学生自己上传的资源应允许自己删除

app/views/files/_course_list.html.erb

@@ -57,7 +57,7 @@
             <div class="mt5">
               <p class="f_l mb5 c_grey02">文件大小：<%= number_to_human_size(file.filesize) %></p>
               <%= link_to( l(:button_delete), attachment_path(file),
-                           :data => {:confirm => l(:text_are_you_sure)}, :method => :delete,:class => "f_r re_de") if delete_allowed && file.container_id == @course.id && file.container_type == "Course"%>
+                           :data => {:confirm => l(:text_are_you_sure)}, :method => :delete,:class => "f_r re_de") if (delete_allowed || User.current.id == file.author_id) && file.container_id == @course.id && file.container_type == "Course"%>
               <p class="f_r c_grey02" ><%= time_tag(file.created_on).html_safe %><%= l(:label_bids_published_ago) %>&nbsp;&nbsp;|&nbsp;&nbsp;下载<%= file.downloads %>&nbsp;&nbsp;|&nbsp;&nbsp;引用<%= file.quotes.nil? ? 0:file.quotes  %> </p>
             </div>
             <div class="cl"></div>