diff --git a/app/controllers/blog_comments_controller.rb b/app/controllers/blog_comments_controller.rb
index 7220eec27..0224a587d 100644
--- a/app/controllers/blog_comments_controller.rb
+++ b/app/controllers/blog_comments_controller.rb
@@ -71,18 +71,18 @@ class BlogCommentsController < ApplicationController
         @course.save
         redirect_to course_path(:id=>params[:course_id])
       else
-        @article.children.delete
-        @article.delete
+        @article.children.destroy
+        @article.destroy
         redirect_to user_blogs_path(:user_id=>User.current)
       end
 
     else#如果是回复被删，
       if params[:course_id] #如果带了course_id过来了，那么这是要跳到课程大纲去的
-        @article.delete
+        @article.destroy
         redirect_to syllabus_course_path(:id=>params[:course_id])
       else
         root = @article.root
-        @article.delete
+        @article.destroy
         redirect_to user_blog_blog_comment_path(:user_id=>root.author_id,:blog_id=>root.blog_id,:id=>root.id)
       end
 
diff --git a/app/views/users/_user_activities.html.erb b/app/views/users/_user_activities.html.erb
index 5061acbc1..6e590d293 100644
--- a/app/views/users/_user_activities.html.erb
+++ b/app/views/users/_user_activities.html.erb
@@ -56,7 +56,7 @@
         </script>
         <% unless user_activity.act_type == "ProjectCreateInfo" %>
         <% act= user_activity.act  %>
-        <% cache (user_activity) do %>
+        <% cache (act) do %>
         <% case user_activity.container_type.to_s %>
         <% when 'Course' %>
             <% if act  %>