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300 lines
8.8 KiB
300 lines
8.8 KiB
4 years ago
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<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace think\model\relation;
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use think\Exception;
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use think\Loader;
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use think\Model;
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use think\model\Relation;
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class MorphTo extends Relation
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{
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// 多态字段
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protected $morphKey;
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protected $morphType;
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// 多态别名
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protected $alias;
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protected $relation;
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/**
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* 构造函数
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* @access public
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* @param Model $parent 上级模型对象
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* @param string $morphType 多态字段名
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* @param string $morphKey 外键名
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* @param array $alias 多态别名定义
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* @param string $relation 关联名
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*/
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public function __construct(Model $parent, $morphType, $morphKey, $alias = [], $relation = null)
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{
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$this->parent = $parent;
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$this->morphType = $morphType;
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$this->morphKey = $morphKey;
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$this->alias = $alias;
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$this->relation = $relation;
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}
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/**
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* 获取当前的关联模型类的实例
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* @access public
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* @return Model
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*/
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public function getModel()
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{
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$morphType = $this->morphType;
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$model = $this->parseModel($this->parent->$morphType);
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return (new $model);
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}
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/**
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* 延迟获取关联数据
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* @param string $subRelation 子关联名
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* @param \Closure $closure 闭包查询条件
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* @return mixed
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*/
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public function getRelation($subRelation = '', $closure = null)
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{
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$morphKey = $this->morphKey;
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$morphType = $this->morphType;
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// 多态模型
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$model = $this->parseModel($this->parent->$morphType);
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// 主键数据
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$pk = $this->parent->$morphKey;
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$relationModel = (new $model)->relation($subRelation)->find($pk);
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if ($relationModel) {
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$relationModel->setParent(clone $this->parent);
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}
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return $relationModel;
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}
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/**
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* 根据关联条件查询当前模型
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* @access public
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* @param string $operator 比较操作符
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* @param integer $count 个数
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* @param string $id 关联表的统计字段
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* @param string $joinType JOIN类型
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* @return Query
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*/
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public function has($operator = '>=', $count = 1, $id = '*', $joinType = 'INNER')
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{
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return $this->parent;
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}
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/**
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* 根据关联条件查询当前模型
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* @access public
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* @param mixed $where 查询条件（数组或者闭包）
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* @param mixed $fields 字段
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* @return Query
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*/
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public function hasWhere($where = [], $fields = null)
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{
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throw new Exception('relation not support: hasWhere');
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}
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/**
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* 解析模型的完整命名空间
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* @access protected
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* @param string $model 模型名（或者完整类名）
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* @return string
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*/
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protected function parseModel($model)
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{
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if (isset($this->alias[$model])) {
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$model = $this->alias[$model];
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}
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if (false === strpos($model, '\\')) {
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$path = explode('\\', get_class($this->parent));
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array_pop($path);
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array_push($path, Loader::parseName($model, 1));
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$model = implode('\\', $path);
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}
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return $model;
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}
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/**
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* 设置多态别名
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* @access public
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* @param array $alias 别名定义
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* @return $this
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*/
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public function setAlias($alias)
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{
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$this->alias = $alias;
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return $this;
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}
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/**
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* 移除关联查询参数
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* @access public
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* @return $this
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*/
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public function removeOption()
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{
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return $this;
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}
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/**
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* 预载入关联查询
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* @access public
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* @param array $resultSet 数据集
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* @param string $relation 当前关联名
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* @param string $subRelation 子关联名
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* @param \Closure $closure 闭包
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* @return void
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* @throws Exception
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*/
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public function eagerlyResultSet(&$resultSet, $relation, $subRelation, $closure)
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{
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$morphKey = $this->morphKey;
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$morphType = $this->morphType;
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$range = [];
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foreach ($resultSet as $result) {
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// 获取关联外键列表
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if (!empty($result->$morphKey)) {
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$range[$result->$morphType][] = $result->$morphKey;
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}
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}
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if (!empty($range)) {
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// 关联属性名
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$attr = Loader::parseName($relation);
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foreach ($range as $key => $val) {
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// 多态类型映射
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$model = $this->parseModel($key);
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$obj = new $model;
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$pk = $obj->getPk();
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$list = $obj->all($val, $subRelation);
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$data = [];
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foreach ($list as $k => $vo) {
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$data[$vo->$pk] = $vo;
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}
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foreach ($resultSet as $result) {
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if ($key == $result->$morphType) {
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// 关联模型
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if (!isset($data[$result->$morphKey])) {
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throw new Exception('relation data not exists :' . $this->model);
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} else {
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$relationModel = $data[$result->$morphKey];
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$relationModel->setParent(clone $result);
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$relationModel->isUpdate(true);
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$result->setRelation($attr, $relationModel);
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}
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}
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}
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}
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}
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}
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/**
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* 预载入关联查询
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* @access public
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* @param Model $result 数据对象
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* @param string $relation 当前关联名
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* @param string $subRelation 子关联名
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* @param \Closure $closure 闭包
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* @return void
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*/
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public function eagerlyResult(&$result, $relation, $subRelation, $closure)
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{
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$morphKey = $this->morphKey;
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$morphType = $this->morphType;
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// 多态类型映射
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$model = $this->parseModel($result->{$this->morphType});
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$this->eagerlyMorphToOne($model, $relation, $result, $subRelation);
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}
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/**
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* 关联统计
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* @access public
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* @param Model $result 数据对象
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* @param \Closure $closure 闭包
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* @return integer
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*/
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public function relationCount($result, $closure)
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{
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}
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/**
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* 多态MorphTo 关联模型预查询
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* @access public
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* @param object $model 关联模型对象
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* @param string $relation 关联名
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* @param $result
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* @param string $subRelation 子关联
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* @return void
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*/
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protected function eagerlyMorphToOne($model, $relation, &$result, $subRelation = '')
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{
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// 预载入关联查询 支持嵌套预载入
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$pk = $this->parent->{$this->morphKey};
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$data = (new $model)->with($subRelation)->find($pk);
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if ($data) {
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$data->setParent(clone $result);
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$data->isUpdate(true);
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}
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$result->setRelation(Loader::parseName($relation), $data ?: null);
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}
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/**
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* 添加关联数据
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* @access public
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* @param Model $model 关联模型对象
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* @param string $type 多态类型
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* @return Model
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*/
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public function associate($model, $type = '')
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{
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$morphKey = $this->morphKey;
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$morphType = $this->morphType;
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$pk = $model->getPk();
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$this->parent->setAttr($morphKey, $model->$pk);
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$this->parent->setAttr($morphType, $type ?: get_class($model));
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$this->parent->save();
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return $this->parent->setRelation($this->relation, $model);
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}
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/**
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* 注销关联数据
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* @access public
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* @return Model
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*/
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public function dissociate()
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{
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$morphKey = $this->morphKey;
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$morphType = $this->morphType;
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$this->parent->setAttr($morphKey, null);
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$this->parent->setAttr($morphType, null);
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$this->parent->save();
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return $this->parent->setRelation($this->relation, null);
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}
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/**
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* 创建关联统计子查询
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* @access public
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* @param \Closure $closure 闭包
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* @param string $name 统计数据别名
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* @return string
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*/
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public function getRelationCountQuery($closure, &$name = null)
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{
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throw new Exception('relation not support: withCount');
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}
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}
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