From f0aaa7290c2c64c33c1e63cf45b6ff1ef7c0b2ab Mon Sep 17 00:00:00 2001
From: thinkphp <thinkphp@qq.com>
Date: Mon, 27 Mar 2017 17:56:11 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=B9=E8=BF=9BModel=E7=B1=BB=E7=9A=84readTr?=
 =?UTF-8?q?ansform=E5=92=8CwriteTransform=E6=96=B9=E6=B3=95?=
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---
 library/think/Model.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/library/think/Model.php b/library/think/Model.php
index ae4f2993..47fdc502 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -367,6 +367,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      */
     protected function writeTransform($value, $type)
     {
+        if (is_null($value)) {
+            return null;
+        }
+
         if (is_array($type)) {
             list($type, $param) = $type;
         } elseif (strpos($type, ':')) {
@@ -475,6 +479,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      */
     protected function readTransform($value, $type)
     {
+        if (is_null($value)) {
+            return null;
+        }
+
         if (is_array($type)) {
             list($type, $param) = $type;
         } elseif (strpos($type, ':')) {