回复的时候要更新activity的的更新时间

app/controllers/blog_comments_controller.rb

@@ -104,7 +104,11 @@ class BlogCommentsController < ApplicationController
     @blogComment.title = "RE: #{@article.title}" unless params[:blog_comment][:title]
     @article.children << @blogComment
     @user_activity_id = params[:user_activity_id]
-
+    user_activity = UserActivity.where("act_type='BlogComment' and act_id =#{@article.id}").first
+    if user_activity
+      user_activity.updated_at = Time.now
+      user_activity.save
+    end
     attachments = Attachment.attach_files(@blogComment, params[:attachments])
     render_attachment_warning_if_needed(@blogComment)
     #@article.save