修正讨论区帖子数量显示不正确问题

app/views/layouts/base_courses.html.erb

@@ -133,7 +133,7 @@
         </div>
         <div class="subNav">
           <%= link_to l(:label_course_board), course_boards_path(@course), :class => "f14 c_blue02" %>
-          <%= link_to "(#{@course.boards.count})", course_boards_path(@course), :class => "subnav_num c_orange" %>
+          <%= link_to "(#{@course.boards[0].topics.count})", course_boards_path(@course), :class => "subnav_num c_orange" %>
           <%= link_to( "+#{l(:label_message_new)}", course_boards_path(@course), :class => 'subnav_green ml95 c_white') if is_teacher %>
         </div>
         <div class="subNav">