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/controllers/exercise_controller.rb

@@ -27,7 +27,7 @@ class ExerciseController < ApplicationController
     if @is_teacher || User.current.admin?
       exercises = @course.exercises.order("created_at asc")
     else
-      exercises = @course.exercises.where("exercise_status <> 1 ").order("created_at asc")
+      exercises = @course.exercises.where("exercise_status <> 1").order("created_at asc")
     end
     @exercises = paginateHelper exercises,20 #分页
     respond_to do |format|

app/views/exercise/_exercise.html.erb

@@ -56,7 +56,10 @@
             <!--li><%#= link_to poll_name, poll_result_poll_path(poll.id), :class => "polls_title polls_title_st fl c_dblue" %></li>
             <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"%>
+        <%= 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>