Query类的relation方法和with方法一样支持使用闭包进行自定义关联查询

library/think/model/relation/HasOne.php

@@ -38,13 +38,16 @@ class HasOne extends OneToOne
 
     /**
      * 延迟获取关联数据
+     * @param \Closure  $closure 闭包查询条件
      * @access public
      */
-    public function getRelation()
+    public function getRelation($colsure = null)
     {
         // 执行关联定义方法
         $localKey = $this->localKey;
-
+        if ($closure) {
+            call_user_func_array($closure, [ & $this->query]);
+        }
         // 判断关联类型执行查询
         return $this->query->where($this->foreignKey, $this->parent->$localKey)->find();
     }