学生打开新建的作业列表报500

app/views/student_work/_student_work_list.html.erb

@@ -56,8 +56,8 @@
           <% else %>
             <% work= params[:show_work_id].nil? ? @homework.student_works.where("user_id = ?",User.current.id).first : StudentWork.find(params[:show_work_id]) %>
           <% end %>
-          location.hash = "<%=work.id %>";
           <% unless work.nil? %>
+              location.hash = "<%=work.id %>";
               <% if @homework.homework_type == 2 %>
                   $("#about_hwork_<%= work.id%>").html("<%= escape_javascript(render :partial => 'programing_work_show',:locals => {:work =>work,:score =>student_work_score(work,User.current),:student_work_scores => work.student_works_scores.order("updated_at desc"),:is_focus => @is_focus}) %>");