<?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 Exception;
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use think\db\BaseQuery as Query;
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use think\db\Raw;
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use think\Model;
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use think\model\Pivot;
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/**
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* 多态多对多关联.
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*/
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class MorphToMany extends BelongsToMany
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{
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/**
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* 多态关系的模型名映射别名的数组.
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*
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* @var array
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*/
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protected static $morphMap = [];
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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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* 多态模型名.
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*
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* @var string
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*/
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protected $morphClass;
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/**
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* 是否反向关联.
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*
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* @var bool
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*/
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protected $inverse;
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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 $middle 中间表名/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 $localKey 当前模型关联键
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* @param bool $inverse 反向关联
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*/
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public function __construct(Model $parent, string $model, string $middle, string $morphType, string $morphKey, string $localKey, bool $inverse = false)
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{
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$this->morphType = $morphType;
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$this->inverse = $inverse;
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$this->morphClass = $inverse ? $model : get_class($parent);
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if (isset(static::$morphMap[$this->morphClass])) {
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$this->morphClass = static::$morphMap[$this->morphClass];
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}
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$foreignKey = $inverse ? $morphKey : $localKey;
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$localKey = $inverse ? $localKey : $morphKey;
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parent::__construct($parent, $model, $middle, $foreignKey, $localKey);
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}
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/**
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* 预载入关联查询（数据集）.
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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 $cache = []): void
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{
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$pk = $resultSet[0]->getPk();
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$range = [];
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foreach ($resultSet as $result) {
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// 获取关联外键列表
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if (isset($result->$pk)) {
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$range[] = $result->$pk;
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}
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}
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if (!empty($range)) {
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// 查询关联数据
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$data = $this->eagerlyManyToMany([
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['pivot.' . $this->localKey, 'in', $range],
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['pivot.' . $this->morphType, '=', $this->morphClass],
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], $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（单个数据）.
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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->$pk)) {
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$pk = $result->$pk;
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// 查询管理数据
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$data = $this->eagerlyManyToMany([
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['pivot.' . $this->localKey, '=', $pk],
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['pivot.' . $this->morphType, '=', $this->morphClass],
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], $subRelation, $closure, $cache);
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// 关联数据封装
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if (!isset($data[$pk])) {
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$data[$pk] = [];
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}
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$result->setRelation($relation, $this->resultSetBuild($data[$pk], 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 int
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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 $this->belongsToManyQuery($this->foreignKey, $this->localKey, [
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['pivot.' . $this->localKey, '=', $result->$pk],
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['pivot.' . $this->morphType, '=', $this->morphClass],
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])->$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 $this->belongsToManyQuery($this->foreignKey, $this->localKey, [
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['pivot.' . $this->localKey, 'exp', new Raw('=' . $this->parent->db(false)->getTable(true) . '.' . $this->parent->getPk())],
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['pivot.' . $this->morphType, '=', $this->morphClass],
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])->fetchSql()->$aggregate($field);
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}
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/**
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* BELONGS TO MANY 关联查询.
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*
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* @param string $foreignKey 关联模型关联键
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* @param string $localKey 当前模型关联键
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* @param array $condition 关联查询条件
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*
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* @return Query
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*/
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protected function belongsToManyQuery(string $foreignKey, string $localKey, array $condition = []): Query
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{
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// 关联查询封装
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$tableName = $this->query->getTable();
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$table = $this->pivot->db()->getTable();
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$fields = $this->getQueryFields($tableName);
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$query = $this->query
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->field($fields)
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->tableField(true, $table, 'pivot', 'pivot__');
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if (empty($this->baseQuery)) {
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$relationFk = $this->query->getPk();
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$query->join([$table => 'pivot'], 'pivot.' . $foreignKey . '=' . $tableName . '.' . $relationFk)
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->where($condition);
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}
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return $query;
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}
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/**
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* 多对多 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 eagerlyManyToMany(array $where, array $subRelation = [], ?Closure $closure = null, array $cache = []): array
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{
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if ($closure) {
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$closure($this->query);
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}
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$withLimit = $this->query->getOptions('limit');
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if ($withLimit) {
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$this->query->removeOption('limit');
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}
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// 预载入关联查询 支持嵌套预载入
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$list = $this->belongsToManyQuery($this->foreignKey, $this->localKey, $where)
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->with($subRelation)
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->cache($cache[0] ?? false, $cache[1] ?? null, $cache[2] ?? null)
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->select();
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// 组装模型数据
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$data = [];
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foreach ($list as $set) {
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$pivot = [];
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foreach ($set->getData() as $key => $val) {
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if (str_contains($key, '__')) {
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[$name, $attr] = explode('__', $key, 2);
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if ('pivot' == $name) {
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$pivot[$attr] = $val;
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unset($set->$key);
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}
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}
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}
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$key = $pivot[$this->localKey];
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if ($withLimit && isset($data[$key]) && count($data[$key]) >= $withLimit) {
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continue;
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}
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$set->setRelation($this->pivotDataName, $this->newPivot($pivot));
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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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* 附加关联的一个中间表数据.
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*
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* @param mixed $data 数据 可以使用数组、关联模型对象 或者 关联对象的主键
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* @param array $pivot 中间表额外数据
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*
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* @return array|Pivot
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*/
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public function attach($data, array $pivot = [])
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{
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if (is_array($data)) {
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if (key($data) === 0) {
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$id = $data;
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} else {
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// 保存关联表数据
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$model = new $this->model();
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$id = $model->insertGetId($data);
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}
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} elseif (is_numeric($data) || is_string($data)) {
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// 根据关联表主键直接写入中间表
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$id = $data;
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} elseif ($data instanceof Model) {
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// 根据关联表主键直接写入中间表
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$id = $data->getKey();
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}
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if (!empty($id)) {
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// 保存中间表数据
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$pivot[$this->localKey] = $this->parent->getKey();
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$pivot[$this->morphType] = $this->morphClass;
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$ids = (array) $id;
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$result = [];
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foreach ($ids as $id) {
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$pivot[$this->foreignKey] = $id;
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$this->pivot->replace()
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->exists(false)
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->data([])
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->save($pivot);
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$result[] = $this->newPivot($pivot);
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}
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if (count($result) == 1) {
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// 返回中间表模型对象
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$result = $result[0];
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}
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return $result;
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} else {
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throw new Exception('miss relation data');
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}
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}
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/**
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* 判断是否存在关联数据.
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*
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* @param mixed $data 数据 可以使用关联模型对象 或者 关联对象的主键
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*
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* @return Pivot|false
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*/
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public function attached($data)
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{
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if ($data instanceof Model) {
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$id = $data->getKey();
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} else {
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$id = $data;
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}
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$pivot = $this->pivot
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->where($this->localKey, $this->parent->getKey())
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->where($this->morphType, $this->morphClass)
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->where($this->foreignKey, $id)
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->find();
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return $pivot ?: false;
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}
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/**
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* 解除关联的一个中间表数据.
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*
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* @param int|array $data 数据 可以使用关联对象的主键
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* @param bool $relationDel 是否同时删除关联表数据
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*
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* @return int
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*/
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public function detach($data = null, bool $relationDel = false): int
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{
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if (is_array($data)) {
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$id = $data;
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} elseif (is_numeric($data) || is_string($data)) {
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// 根据关联表主键直接写入中间表
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$id = $data;
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} elseif ($data instanceof Model) {
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// 根据关联表主键直接写入中间表
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$id = $data->getKey();
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}
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// 删除中间表数据
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$pivot = [
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[$this->localKey, '=', $this->parent->getKey()],
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[$this->morphType, '=', $this->morphClass],
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];
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if (isset($id)) {
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$pivot[] = [$this->foreignKey, is_array($id) ? 'in' : '=', $id];
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}
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$result = $this->pivot->where($pivot)->delete();
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// 删除关联表数据
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if (isset($id) && $relationDel) {
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$model = $this->model;
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$model::destroy($id);
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}
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return $result;
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}
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/**
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* 数据同步.
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*
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* @param array $ids
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* @param bool $detaching
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*
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* @return array
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*/
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public function sync(array $ids, bool $detaching = true): array
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{
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$changes = [
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'attached' => [],
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'detached' => [],
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'updated' => [],
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];
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$current = $this->pivot
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->where($this->localKey, $this->parent->getKey())
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->where($this->morphType, $this->morphClass)
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->column($this->foreignKey);
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$records = [];
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foreach ($ids as $key => $value) {
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if (!is_array($value)) {
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$records[$value] = [];
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} else {
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$records[$key] = $value;
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}
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}
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$detach = array_diff($current, array_keys($records));
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if ($detaching && count($detach) > 0) {
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$this->detach($detach);
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$changes['detached'] = $detach;
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}
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foreach ($records as $id => $attributes) {
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if (!in_array($id, $current)) {
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$this->attach($id, $attributes);
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$changes['attached'][] = $id;
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} elseif (count($attributes) > 0 && $this->attach($id, $attributes)) {
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$changes['updated'][] = $id;
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}
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}
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return $changes;
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}
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/**
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* 执行基础查询（仅执行一次）.
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*
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* @return void
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*/
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protected function baseQuery(): void
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{
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if (empty($this->baseQuery)) {
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$foreignKey = $this->foreignKey;
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$localKey = $this->localKey;
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// 关联查询
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$this->belongsToManyQuery($foreignKey, $localKey, [
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['pivot.' . $localKey, '=', $this->parent->getKey()],
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['pivot.' . $this->morphType, '=', $this->morphClass],
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]);
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$this->baseQuery = true;
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}
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}
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/**
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* 设置或获取多态关系的模型名映射别名的数组.
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*
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* @param array|null $map
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* @param bool $merge
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*
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* @return array
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*/
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public static function morphMap(?array $map = null, $merge = true): array
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{
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if (is_array($map)) {
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static::$morphMap = $merge && static::$morphMap
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? $map + static::$morphMap : $map;
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}
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return static::$morphMap;
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}
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}
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