<?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) 2006~2023 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 BackedEnum;
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use Closure;
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use think\db\exception\DbException as Exception;
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use think\db\Query;
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use think\helper\Str;
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use think\Model;
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use think\model\Relation;
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/**
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* 多态关联类.
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*/
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class MorphTo extends Relation
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{
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/**
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* 多态关联外键.
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*
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* @var string
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*/
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protected $morphKey;
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/**
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* 多态字段.
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*
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* @var string
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*/
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protected $morphType;
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/**
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* 多态别名.
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*
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* @var array
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*/
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protected $alias = [];
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/**
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* 关联名.
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*
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* @var string
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*/
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protected $relation;
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protected $queryCaller = [];
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/**
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* 架构函数.
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*
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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, string $morphType, string $morphKey, array $alias = [], ?string $relation = null)
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{
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$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 = $relation;
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}
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/**
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* 获取当前的关联模型类的实例.
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*
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* @return Model
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*/
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public function getModel(): Model
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{
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$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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*
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* @param array $subRelation 子关联名
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* @param ?Closure $closure 闭包查询条件
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*
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* @return Model
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*/
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public function getRelation(array $subRelation = [], ?Closure $closure = null)
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{
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$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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$relationModel = class_exists($model) ? $this->buildQuery((new $model())->relation($subRelation))->find($pk) : null;
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if ($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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*
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* @param string $operator 比较操作符
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* @param int $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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* @param Query $query Query对象
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*
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* @return Query
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*/
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public function has(string $operator = '>=', int $count = 1, string $id = '*', string $joinType = '', ?Query $query = null)
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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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*
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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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* @param string $joinType JOIN类型
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* @param ?Query $query Query对象
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*
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* @return Query
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*/
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public function hasWhere($where = [], $fields = null, string $joinType = '', ?Query $query = null)
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{
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$alias = class_basename($this->parent);
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$types = $this->parent->distinct()->column($this->morphType);
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$query = $query ?: $this->parent->db();
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return $query->alias($alias)
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->where(function (Query $query) use ($types, $where, $alias) {
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foreach ($types as $type) {
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if ($type) {
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$query->whereExists(function (Query $query) use ($type, $where, $alias) {
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$class = $this->parseModel($type);
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/** @var Model $model */
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$model = new $class();
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$table = $model->getTable();
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$query
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->table($table)
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->where($alias . '.' . $this->morphType, $type)
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->whereRaw("`{$alias}`.`{$this->morphKey}`=`{$table}`.`{$model->getPk()}`")
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->where($where);
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}, 'OR');
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}
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}
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});
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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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*
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* @param string $model 模型名（或者完整类名）
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*
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* @return Model
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*/
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protected function parseModel($model): string
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{
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if ($model instanceof BackedEnum) {
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$model = $model->value;
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}
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if (isset($this->alias[$model])) {
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$model = $this->alias[$model];
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}
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if (!str_contains($model, '\\')) {
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$path = explode('\\', get_class($this->parent));
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array_pop($path);
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array_push($path, Str::studly($model));
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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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*
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* @param array $alias 别名定义
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*
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* @return $this
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*/
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public function setAlias(array $alias)
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{
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$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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*
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* @return $this
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*/
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public function removeOption(string $option = '')
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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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*
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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 array $subRelation 子关联名
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* @param ?Closure $closure 闭包
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* @param array $cache 关联缓存
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*
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* @throws Exception
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*
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* @return void
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*/
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public function eagerlyResultSet(array &$resultSet, string $relation, array $subRelation, ?Closure $closure = null, array $cache = []): void
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{
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$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($range)) {
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foreach ($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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$data = [];
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if (class_exists($model)) {
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$obj = new $model();
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if (!is_null($closure)) {
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$obj = $closure($obj);
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}
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$pk = $obj->getPk();
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$list = $obj->with($subRelation)
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->cache($cache[0] ?? false, $cache[1] ?? null, $cache[2] ?? null)
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->select($val);
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foreach ($list as $k => $vo) {
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$data[$vo->$pk] = $vo;
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}
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}
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foreach ($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->$morphKey])) {
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$relationModel = null;
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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->exists(true);
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}
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$result->setRelation($relation, $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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* 预载入关联查询.
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*
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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 array $subRelation 子关联名
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* @param ?Closure $closure 闭包
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* @param array $cache 关联缓存
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*
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* @return void
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*/
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public function eagerlyResult(Model $result, string $relation, array $subRelation = [], ?Closure $closure = null, array $cache = []): void
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{
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// 多态类型映射
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$model = $this->parseModel($result->{$this->morphType});
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$this->eagerlyMorphToOne($model, $relation, $result, $subRelation, $cache);
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}
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/**
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* 关联统计
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*
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* @param Model $result 数据对象
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* @param ?Closure $closure 闭包
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* @param string $aggregate 聚合查询方法
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* @param string $field 字段
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*
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* @return int
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*/
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public function relationCount(Model $result, ?Closure $closure = null, string $aggregate = 'count', string $field = '*')
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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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*
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* @param string $model 关联模型对象
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* @param string $relation 关联名
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* @param Model $result
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* @param array $subRelation 子关联
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* @param array $cache 关联缓存
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*
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* @return void
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*/
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protected function eagerlyMorphToOne(string $model, string $relation, Model $result, array $subRelation = [], array $cache = []): void
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{
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// 预载入关联查询 支持嵌套预载入
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$pk = $this->parent->{$this->morphKey};
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$data = null;
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if (class_exists($model)) {
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$data = (new $model())->with($subRelation)
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->cache($cache[0] ?? false, $cache[1] ?? null, $cache[2] ?? null)
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->find($pk);
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if ($data) {
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$data->setParent(clone $result);
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$data->exists(true);
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}
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}
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$result->setRelation($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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*
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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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*
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* @return Model
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*/
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public function associate(Model $model, string $type = ''): Model
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{
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$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, $model);
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}
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/**
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* 注销关联数据.
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*
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* @return Model
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*/
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public function dissociate(): Model
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{
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$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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protected function buildQuery(Query $query)
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{
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foreach ($this->queryCaller as $caller) {
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call_user_func_array([$query, $caller[0]], $caller[1]);
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}
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return $query;
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}
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public function __call($method, $args)
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{
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$this->queryCaller[] = [$method, $args];
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return $this;
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}
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}
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