若测验已截止且学生已提交则在测验列表后面显示“已答”

app/views/exercise/_exercise.html.erb

@@ -57,6 +57,9 @@
             <li class="pollsbtn_tip fl ml5">已答</li-->
         <%#else%>
         <%= link_to (index.to_i+1).to_s+". "+exercise_name, exercise_path(exercise.id), :class => "polls_title polls_title_st fl c_dblue"%>
+        <% if exercise.end_time <= Time.now && has_commit_exercise?(exercise.id, User.current.id) %>
+            <li class="pollsbtn_tip fl ml5">已答</li>
+        <% end %>
         <%#end%>
     <% end%>
     <li class="polls_date fr mr10">截止时间：<%= format_time(exercise.end_time.to_s)%></li>