From 1f6ed64e540e96850d945e9ce8c76e62dd5fc89a Mon Sep 17 00:00:00 2001
From: sw <939547590@qq.com>
Date: Fri, 17 Jul 2015 14:48:20 +0800
Subject: [PATCH] =?UTF-8?q?=E5=88=A0=E9=99=A4=E4=BD=9C=E5=93=81=E6=97=B6?=
 =?UTF-8?q?=EF=BC=8C=E5=88=A0=E9=99=A4=E4=BD=9C=E5=93=81=E7=9A=84=E7=82=B9?=
 =?UTF-8?q?=E8=B5=9E=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/models/student_work.rb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/app/models/student_work.rb b/app/models/student_work.rb
index 0db36b4ba..c80d1315b 100644
--- a/app/models/student_work.rb
+++ b/app/models/student_work.rb
@@ -9,5 +9,11 @@ class StudentWork < ActiveRecord::Base
   belongs_to :project
   has_one :student_work_test
 
+  before_destroy :delete_praise
+
   acts_as_attachable
+
+  def delete_praise
+    PraiseTread.where("praise_tread_object_id = #{self.id} AND praise_tread_object_type = 'StudentWork'").destroy_all
+  end
 end