课程首页公开资料数显示错误

app/views/welcome/_course_list.html.erb

@@ -25,7 +25,7 @@
             <%= link_to course.school.name.try(:gsub, /(.+)$/, '\1'), options={:action => 'course', :school_id => course.school.id}, html_options={:method => 'get'} %>
         <% end %>
         (<%= course.members.count %>人)
-        <% files_count = course.attachments.count %>
+        <% files_count = visable_attachemnts_incourse(course).count %>
         <% if files_count > 0%>
             (<%= link_to "#{files_count.to_s}份", course_files_path(course) %>公开资料)
         <% end %>