修改课程老师名称过长时页面显示异常

app/views/welcome/_course_list.html.erb

@@ -13,7 +13,7 @@
 
         </span>
         <span class='font_bolder'>
-            <%= link_to(course.try(:teacher).try(:realname), user_path(course.teacher)) %>
+            <%= link_to(course.try(:teacher).try(:realname).truncate(6, omission: '...'), user_path(course.teacher)) %>
           <%#=course.try(:teacher).try(:name)%>
         </span>
       </div>