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thinkphp/library/think/model/Relation.php

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+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: liu21st <liu21st@gmail.com>
+// +----------------------------------------------------------------------
+
+namespace think\model;
+
+use think\db\Query;
+use think\Exception;
+use think\Model;
+
+/**
+ * Class Relation
+ * @package think\model
+ *
+ * @mixin Query
+ */
+abstract class Relation
+{
+    // 父模型对象
+    protected $parent;
+    /** @var  Model 当前关联的模型类 */
+    protected $model;
+    /** @var Query 关联模型查询对象 */
+    protected $query;
+    // 关联表外键
+    protected $foreignKey;
+    // 关联表主键
+    protected $localKey;
+    // 基础查询
+    protected $baseQuery;
+
+    /**
+     * 获取关联的所属模型
+     * @access public
+     * @return Model
+     */
+    public function getParent()
+    {
+        return $this->parent;
+    }
+
+    /**
+     * 获取当前的关联模型类
+     * @access public
+     * @return string
+     */
+    public function getModel()
+    {
+        return $this->model;
+    }
+
+    /**
+     * 获取关联的查询对象
+     * @access public
+     * @return Query
+     */
+    public function getQuery()
+    {
+        return $this->query;
+    }
+
+    /**
+     * 封装关联数据集
+     * @access public
+     * @param array $resultSet 数据集
+     * @return mixed
+     */
+    protected function resultSetBuild($resultSet)
+    {
+        return (new $this->model)->toCollection($resultSet);
+    }
+
+    protected function getQueryFields($model)
+    {
+        $fields = $this->query->getOptions('field');
+        return $this->getRelationQueryFields($fields, $model);
+    }
+
+    protected function getRelationQueryFields($fields, $model)
+    {
+        if ($fields) {
+
+            if (is_string($fields)) {
+                $fields = explode(',', $fields);
+            }
+
+            foreach ($fields as &$field) {
+                if (false === strpos($field, '.')) {
+                    $field = $model . '.' . $field;
+                }
+            }
+        } else {
+            $fields = $model . '.*';
+        }
+
+        return $fields;
+    }
+
+    /**
+     * 执行基础查询（仅执行一次）
+     * @access protected
+     * @return void
+     */
+    protected function baseQuery()
+    {}
+
+    public function __call($method, $args)
+    {
+        if ($this->query) {
+            // 执行基础查询
+            $this->baseQuery();
+
+            $result = call_user_func_array([$this->query, $method], $args);
+            if ($result instanceof Query) {
+                return $this;
+            } else {
+                $this->baseQuery = false;
+                return $result;
+            }
+        } else {
+            throw new Exception('method not exists:' . __CLASS__ . '->' . $method);
+        }
+    }
+}