<%= link_to image_tag(url_to_avatar(activity.author), :width => "50", :height => "50"), user_path(activity.author_id), :alt => "用户头像" %>
<% if @ctivity.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+" | 课程通知", course_news_index_path(activity.course), :class => "newsBlue ml15" %>
<%= link_to activity.title.to_s, news_path(activity), :class => "postGrey" %>
发布时间:<%= format_time(activity.created_on) %>
<%= activity.description.html_safe %>