fixbug

app/views/users/_course_item.html.erb

@@ -14,11 +14,11 @@
     <% end %>
     <div class="substance">
       <p class="subName font-16">
-        <span><%= object.name %></span>
+        <span><%= object&.name %></span>
       </p>
-      <span><%= image_tag(url_to_avatar(object.teacher), :width => "60", :height => "60", :class => "radius mt15", :alt => "用户") %></span>
-      <p class="font-14 mt10"><span><%= object.teacher.show_name %></span></p>
-      <p class="font-16 mb15 task-hide"><span class="color-grey-98"><%= object.teacher.school_name == "" ? "--" : object.teacher.school_name %></span></p>
+      <span><%= image_tag(url_to_avatar(object&.teacher), :width => "60", :height => "60", :class => "radius mt15", :alt => "用户") %></span>
+      <p class="font-14 mt10"><span><%= object&.teacher.&show_name %></span></p>
+      <p class="font-16 mb15 task-hide"><span class="color-grey-98"><%= object&.teacher&.school_name.present? ? "--" : object&.teacher&.school_name %></span></p>
     </div>
     <div class="edu-txt-center course-bottom">
       <div class="inline color-grey-B4">