1、更换编辑器

2、内核升级

core/library/think/model/relation/BelongsTo.php

@@ -0,0 +1,51 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: liu21st <liu21st@gmail.com>
+// +----------------------------------------------------------------------
+
+namespace think\model\relation;
+
+use think\Model;
+use think\model\relation\OneToOne;
+
+class BelongsTo extends OneToOne
+{
+    /**
+     * 架构函数
+     * @access public
+     * @param Model  $parent 上级模型对象
+     * @param string $model 模型名
+     * @param string $foreignKey 关联外键
+     * @param string $otherKey 关联主键
+     * @param array  $alias 别名定义
+     * @param string $joinType JOIN类型
+     */
+    public function __construct(Model $parent, $model, $foreignKey, $localKey, $alias = [], $joinType = 'INNER')
+    {
+        $this->parent     = $parent;
+        $this->model      = $model;
+        $this->foreignKey = $foreignKey;
+        $this->localKey   = $localKey;
+        $this->alias      = $alias;
+        $this->joinType   = $joinType;
+        $this->query      = (new $model)->db();
+    }
+
+    /**
+     * 延迟获取关联数据
+     * @access public
+     */
+    public function getRelation()
+    {
+        $foreignKey = $this->foreignKey;
+        $localKey   = $this->localKey;
+        return $this->query->where($localKey, $this->parent->$foreignKey)->find();
+    }
+
+}