HasOne关联支持使用hasWhere方法

library/think/model/relation/HasOne.php

@@ -50,4 +50,27 @@ class HasOne extends OneToOne
         return $this->query->where($this->foreignKey, $this->parent->$localKey)->find();
     }
 
+    /**
+     * 根据关联条件查询当前模型
+     * @access public
+     * @param Model    $model 模型对象
+     * @param mixed    $where 查询条件（数组或者闭包）
+     * @return Query
+     */
+    public function hasWhere($model, $where = [])
+    {
+        $table = $this->query->getTable();
+        if (is_array($where)) {
+            foreach ($where as $key => $val) {
+                if (false === strpos($key, '.')) {
+                    $where['b.' . $key] = $val;
+                    unset($where[$key]);
+                }
+            }
+        }
+        return $model->db()->alias('a')
+            ->field('a.*')
+            ->join($table . ' b', 'a.' . $this->localKey . '=b.' . $this->foreignKey, $this->joinType)
+            ->where($where);
+    }
 }