<%= link_to image_tag(url_to_avatar(activity.author), :width => "50", :height => "50"), user_path(activity.author_id), :alt => "用户头像" %>
<% if activity.try(:author).try(:realname) == ' ' %> <%= link_to activity.try(:author), user_path(activity.author_id), :class => "newsBlue mr15" %> <% else %> <%= link_to activity.try(:author).try(:realname), user_path(activity.author_id), :class => "newsBlue mr15" %> <% end %> TO <%= link_to activity.course.name.to_s+"(课程名称)", course_path(activity.container_id), :class => "newsBlue ml15", :style=>"word-break:break-all" %>
<%=activity.filename.to_s(附件名称)%>
时间：<%= format_date(activity.created_on) %>
（附件描述）<%=activity.description.to_s%>