<?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 Closure;
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use think\Collection;
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use think\db\BaseQuery as Query;
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use think\db\exception\DbException as Exception;
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use think\Model;
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use think\model\Relation;
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/**
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* 多态一对多关联.
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*/
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class MorphMany 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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* 多态字段名.
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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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* 多态类型.
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*
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* @var string
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*/
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protected $type;
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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 $model 模型名
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* @param string $morphKey 关联外键
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* @param string $morphType 多态字段名
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* @param string $type 多态类型
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*/
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public function __construct(Model $parent, string $model, string $morphKey, string $morphType, string $type)
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{
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$this->parent = $parent;
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$this->model = $model;
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$this->type = $type;
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$this->morphKey = $morphKey;
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$this->morphType = $morphType;
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$this->query = (new $model())->db();
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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 Collection
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*/
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public function getRelation(array $subRelation = [], ?Closure $closure = null): Collection
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{
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if ($closure) {
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$closure($this->query);
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}
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$this->baseQuery();
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return $this->query->relation($subRelation)
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->select()
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->setParent(clone $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 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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throw new Exception('relation not support: has');
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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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throw new Exception('relation not support: hasWhere');
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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 $cache 关联缓存
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*
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* @return void
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*/
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public function eagerlyResultSet(array &$resultSet, string $relation, array $subRelation, ?Closure $closure = null, array $cache = []): void
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{
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$morphType = $this->morphType;
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$morphKey = $this->morphKey;
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$type = $this->type;
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$range = [];
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foreach ($resultSet as $result) {
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$pk = $result->getPk();
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// 获取关联外键列表
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if (isset($result->$pk)) {
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$range[] = $result->$pk;
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}
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}
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if (!empty($range)) {
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$where = [
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[$morphKey, 'in', $range],
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[$morphType, '=', $type],
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];
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$data = $this->eagerlyMorphToMany($where, $subRelation, $closure, $cache);
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// 关联数据封装
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foreach ($resultSet as $result) {
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if (!isset($data[$result->$pk])) {
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$data[$result->$pk] = [];
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}
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$result->setRelation($relation, $this->resultSetBuild($data[$result->$pk], clone $this->parent));
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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 $cache = []): void
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{
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$pk = $result->getPk();
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if (isset($result->$pk)) {
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$key = $result->$pk;
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$data = $this->eagerlyMorphToMany([
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[$this->morphKey, '=', $key],
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[$this->morphType, '=', $this->type],
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], $subRelation, $closure, $cache);
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if (!isset($data[$key])) {
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$data[$key] = [];
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}
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$result->setRelation($relation, $this->resultSetBuild($data[$key], clone $this->parent));
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}
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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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* @param string $name 统计字段别名
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*
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* @return mixed
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*/
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public function relationCount(Model $result, ?Closure $closure = null, string $aggregate = 'count', string $field = '*', ?string &$name = null)
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{
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$pk = $result->getPk();
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if (!isset($result->$pk)) {
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return 0;
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}
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if ($closure) {
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$closure($this->query, $name);
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}
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return $this->query
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->where([
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[$this->morphKey, '=', $result->$pk],
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[$this->morphType, '=', $this->type],
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])
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->$aggregate($field);
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}
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/**
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* 获取关联统计子查询.
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*
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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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* @param string $name 统计字段别名
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*
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* @return string
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*/
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public function getRelationCountQuery(?Closure $closure = null, string $aggregate = 'count', string $field = '*', ?string &$name = null): string
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{
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if ($closure) {
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$closure($this->query, $name);
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}
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return $this->query
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->whereExp($this->morphKey, '=' . $this->parent->getTable(true) . '.' . $this->parent->getPk())
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->where($this->morphType, '=', $this->type)
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->fetchSql()
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->$aggregate($field);
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}
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/**
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* 多态一对多 关联模型预查询.
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*
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* @param array $where 关联预查询条件
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* @param array $subRelation 子关联
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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 array
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*/
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protected function eagerlyMorphToMany(array $where, array $subRelation = [], ?Closure $closure = null, array $cache = []): array
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{
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// 预载入关联查询 支持嵌套预载入
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$this->query->removeOption('where');
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if ($closure) {
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$this->baseQuery = true;
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$closure($this->query);
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}
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$withLimit = $this->query->getOptions('limit');
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if ($withLimit) {
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$this->query->removeOption('limit');
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}
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$list = $this->query
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->where($where)
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->with($subRelation)
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->cache($cache[0] ?? false, $cache[1] ?? null, $cache[2] ?? null)
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->select();
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$morphKey = $this->morphKey;
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// 组装模型数据
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$data = [];
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foreach ($list as $set) {
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$key = $set->$morphKey;
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if ($withLimit && isset($data[$key]) && count($data[$key]) >= $withLimit) {
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continue;
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}
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$data[$key][] = $set;
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}
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return $data;
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}
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/**
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* 保存（新增）当前关联数据对象
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*
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* @param array|Model $data 数据 可以使用数组 关联模型对象
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* @param bool $replace 是否自动识别更新和写入
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*
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* @return Model|false
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*/
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public function save(array|Model $data, bool $replace = true)
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{
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$model = $this->make();
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return $model->replace($replace)->save($data) ? $model : false;
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}
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/**
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* 创建关联对象实例.
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*
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* @param array|Model $data
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*
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* @return Model
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*/
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public function make($data = []): Model
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{
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if ($data instanceof Model) {
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$data = $data->getData();
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}
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// 保存关联表数据
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$pk = $this->parent->getPk();
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$data[$this->morphKey] = $this->parent->$pk;
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$data[$this->morphType] = $this->type;
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return (new $this->model($data))->setSuffix($this->getModel()->getSuffix());
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}
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/**
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* 批量保存当前关联数据对象
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*
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* @param iterable $dataSet 数据集
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* @param bool $replace 是否自动识别更新和写入
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*
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* @return array|false
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*/
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public function saveAll(iterable $dataSet, bool $replace = true)
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{
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$result = [];
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foreach ($dataSet as $key => $data) {
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$result[] = $this->save($data, $replace);
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}
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return empty($result) ? false : $result;
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}
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/**
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* 获取多态关联外键.
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*
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* @return string
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*/
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public function getMorphKey()
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{
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return $this->morphKey;
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}
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/**
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* 获取多态字段名.
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*
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* @return string
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*/
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public function getMorphType()
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{
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return $this->morphType;
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}
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/**
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* 获取多态类型.
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*
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* @return string
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*/
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public function getType()
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{
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return $this->type;
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}
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/**
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* 执行基础查询（仅执行一次）.
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*
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* @return void
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*/
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protected function baseQuery(): void
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{
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if (empty($this->baseQuery) && $this->parent->getData()) {
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$pk = $this->parent->getPk();
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$this->query->where([
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[$this->morphKey, '=', $this->parent->$pk],
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[$this->morphType, '=', $this->type],
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]);
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$this->baseQuery = true;
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}
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}
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}
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