<?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\Model;
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/**
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* 远程一对一关联类.
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*/
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class HasOneThrough extends HasManyThrough
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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 $closure = null)
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{
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if ($closure) {
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$closure($this->query);
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}
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$this->baseQuery();
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$relationModel = $this->query->relation($subRelation)->find();
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if ($relationModel) {
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$relationModel->setParent(clone $this->parent);
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} else {
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$default = $this->query->getOptions('default_model');
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$relationModel = $this->getDefaultModel($default);
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}
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return $relationModel;
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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 $cache = []): void
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{
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$localKey = $this->localKey;
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$foreignKey = $this->foreignKey;
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$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->$localKey)) {
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$range[] = $result->$localKey;
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}
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}
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if (!empty($range)) {
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$this->query->removeWhereField($foreignKey);
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$default = $this->query->getOptions('default_model');
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$defaultModel = $this->getDefaultModel($default);
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$data = $this->eagerlyWhere([
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[$this->foreignKey, 'in', $range],
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], $foreignKey, $subRelation, $closure, $cache);
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// 关联数据封装
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foreach ($resultSet as $result) {
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// 关联模型
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if (!isset($data[$result->$localKey])) {
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$relationModel = $defaultModel;
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} else {
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$relationModel = $data[$result->$localKey];
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$relationModel->setParent(clone $result);
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$relationModel->exists(true);
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}
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// 设置关联属性
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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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* 预载入关联查询（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 $cache = []): void
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{
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$localKey = $this->localKey;
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$foreignKey = $this->foreignKey;
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$this->query->removeWhereField($foreignKey);
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$data = $this->eagerlyWhere([
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[$foreignKey, '=', $result->$localKey],
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], $foreignKey, $subRelation, $closure, $cache);
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// 关联模型
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if (!isset($data[$result->$localKey])) {
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$default = $this->query->getOptions('default_model');
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$relationModel = $this->getDefaultModel($default);
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} else {
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$relationModel = $data[$result->$localKey];
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$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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* 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 string $key 关联键名
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* @param array $subRelation 子关联
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* @param Closure $closure
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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 eagerlyWhere(array $where, string $key, array $subRelation = [], ?Closure $closure = null, array $cache = []): array
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{
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// 预载入关联查询 支持嵌套预载入
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$keys = $this->through->where($where)->column($this->throughPk, $this->foreignKey);
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if ($closure) {
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$closure($this->query);
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}
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$list = $this->query
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->where($this->throughKey, 'in', $keys)
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->cache($cache[0] ?? false, $cache[1] ?? null, $cache[2] ?? null)
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->select();
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// 组装模型数据
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return array_map(function ($key) use ($list) {
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$set = $list->where($this->throughKey, '=', $key)->first();
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return $set ? clone $set : null;
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}, $keys);
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}
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}
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