编辑分组作业时的基于项目实施总是默认选中

app/views/users/_user_group_attr.html.erb

@@ -10,7 +10,7 @@
 </div>
 <div class="mb10 mt10">
   <label>
-    <input type="checkbox" class="mr5" name="base_on_project" checked value="<%=(edit_mode && homework.is_group_homework?) ? homework.homework_detail_group.base_on_project : 1 %>" id="base_on_project"/>
+    <input type="checkbox" class="mr5" name="base_on_project" value="<%=(edit_mode && homework.is_group_homework?) ? homework.homework_detail_group.base_on_project : 1 %>" id="base_on_project"/>
     <span class="f14 fontGrey3 mr10">基于项目实施</span>
   </label>
   <p class="c_red">提醒：勾选后各小组必须在Trustie平台创建项目，教师可随时观察平台对各小组最新进展的实时统计。</p>