<?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\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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* 远程一对多关联类.
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*/
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class HasManyThrough extends Relation
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{
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/**
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* 中间关联表外键.
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*
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* @var string
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*/
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protected $throughKey;
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/**
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* 中间主键.
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*
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* @var string
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*/
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protected $throughPk;
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/**
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* 中间表查询对象
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*
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* @var Query
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*/
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protected $through;
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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 关联模型名
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* @param string $through 中间模型名
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* @param string $foreignKey 关联外键
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* @param string $throughKey 中间关联外键
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* @param string $localKey 当前模型主键
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* @param string $throughPk 中间模型主键
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*/
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public function __construct(Model $parent, string $model, string $through, string $foreignKey, string $throughKey, string $localKey, string $throughPk)
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{
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$this->parent = $parent;
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$this->model = $model;
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$this->through = (new $through())->db();
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$this->foreignKey = $foreignKey;
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$this->throughKey = $throughKey;
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$this->localKey = $localKey;
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$this->throughPk = $throughPk;
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$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 $closure = null)
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{
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if ($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 $query = null): Query
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{
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$model = Str::snake(class_basename($this->parent));
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$throughTable = $this->through->getTable();
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$pk = $this->throughPk;
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$throughKey = $this->throughKey;
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$relation = new $this->model();
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$relationTable = $relation->getTable();
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$softDelete = $this->query->getOptions('soft_delete');
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if ('*' != $id) {
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$id = $relationTable . '.' . $relation->getPk();
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}
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$query = $query ?: $this->parent->db()->alias($model);
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return $query->field($model . '.*')
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->join($throughTable, $throughTable . '.' . $this->foreignKey . '=' . $model . '.' . $this->localKey)
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->join($relationTable, $relationTable . '.' . $throughKey . '=' . $throughTable . '.' . $this->throughPk)
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->when($softDelete, function ($query) use ($softDelete, $relationTable) {
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$query->where($relationTable . strstr($softDelete[0], '.'), '=' == $softDelete[1][0] ? $softDelete[1][1] : null);
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})
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->group($relationTable . '.' . $this->throughKey)
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->having('count(' . $id . ')' . $operator . $count);
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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, $joinType = '', ?Query $query = null): Query
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{
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$model = Str::snake(class_basename($this->parent));
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$throughTable = $this->through->getTable();
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$pk = $this->throughPk;
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$throughKey = $this->throughKey;
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$modelTable = (new $this->model())->getTable();
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if (is_array($where)) {
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$this->getQueryWhere($where, $modelTable);
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} elseif ($where instanceof Query) {
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$where->via($modelTable);
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} elseif ($where instanceof Closure) {
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$where($this->query->via($modelTable));
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$where = $this->query;
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}
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$fields = $this->getRelationQueryFields($fields, $model);
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$softDelete = $this->query->getOptions('soft_delete');
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$query = $query ?: $this->parent->db();
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return $query->alias($model)
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->via($model)
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->join($throughTable, $throughTable . '.' . $this->foreignKey . '=' . $model . '.' . $this->localKey)
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->join($modelTable, $modelTable . '.' . $throughKey . '=' . $throughTable . '.' . $this->throughPk, $joinType)
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->when($softDelete, function ($query) use ($softDelete, $modelTable) {
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$query->where($modelTable . strstr($softDelete[0], '.'), '=' == $softDelete[1][0] ? $softDelete[1][1] : null);
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})
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->group($modelTable . '.' . $this->throughKey)
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->where(function ($query) use ($where) {
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$query->where($where);
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})
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->field($fields);
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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($foreignKey);
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$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 $result) {
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$pk = $result->$localKey;
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if (!isset($data[$pk])) {
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$data[$pk] = [];
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}
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// 设置关联属性
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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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/**
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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 = $this->foreignKey;
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$pk = $result->$localKey;
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$this->query->removeWhereField($foreignKey);
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$data = $this->eagerlyWhere([
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[$foreignKey, '=', $pk],
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], $foreignKey, $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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* 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 $cache = []): array
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{
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// 预载入关联查询 支持嵌套预载入
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$throughList = $this->through->where($where)->select();
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$keys = $throughList->column($this->throughPk, $this->throughPk);
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if ($closure) {
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$this->baseQuery = true;
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$closure($this->query);
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}
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$throughKey = $this->throughKey;
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if ($this->baseQuery) {
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$throughKey = Str::snake(class_basename($this->model)) . '.' . $this->throughKey;
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}
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$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 = $this->query
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->where($throughKey, 'in', $keys)
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->cache($cache[0] ?? false, $cache[1] ?? null, $cache[2] ?? null)
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->select();
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// 组装模型数据
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$data = [];
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$keys = $throughList->column($this->foreignKey, $this->throughPk);
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foreach ($list as $set) {
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$key = $keys[$set->{$this->throughKey}];
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if ($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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* 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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$localKey = $this->localKey;
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if (!isset($result->$localKey)) {
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return 0;
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}
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if ($closure) {
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$closure($this->query, $name);
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}
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$alias = Str::snake(class_basename($this->model));
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$throughTable = $this->through->getTable();
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$pk = $this->throughPk;
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$throughKey = $this->throughKey;
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$modelTable = $this->parent->getTable();
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if (!str_contains($field, '.')) {
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$field = $alias . '.' . $field;
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}
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return $this->query
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->alias($alias)
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->join($throughTable, $throughTable . '.' . $pk . '=' . $alias . '.' . $throughKey)
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->join($modelTable, $modelTable . '.' . $this->localKey . '=' . $throughTable . '.' . $this->foreignKey)
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->where($throughTable . '.' . $this->foreignKey, $result->$localKey)
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->$aggregate($field);
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}
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/**
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* 创建关联统计子查询.
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*
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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, $name);
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}
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$alias = Str::snake(class_basename($this->model));
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$throughTable = $this->through->getTable();
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$pk = $this->throughPk;
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$throughKey = $this->throughKey;
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$modelTable = $this->parent->getTable();
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if (!str_contains($field, '.')) {
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$field = $alias . '.' . $field;
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}
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return $this->query
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->alias($alias)
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->join($throughTable, $throughTable . '.' . $pk . '=' . $alias . '.' . $throughKey)
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->join($modelTable, $modelTable . '.' . $this->localKey . '=' . $throughTable . '.' . $this->foreignKey)
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->whereExp($throughTable . '.' . $this->foreignKey, '=' . $this->parent->getTable() . '.' . $this->localKey)
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->fetchSql()
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->$aggregate($field);
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}
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/**
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* 执行基础查询（仅执行一次）.
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*
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* @return void
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*/
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protected function baseQuery(): void
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{
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if (empty($this->baseQuery) && $this->parent->getData()) {
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$alias = Str::snake(class_basename($this->model));
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$throughTable = $this->through->getTable();
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$pk = $this->throughPk;
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$throughKey = $this->throughKey;
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$modelTable = $this->parent->getTable();
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$fields = $this->getQueryFields($alias);
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$this->query
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->field($fields)
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->alias($alias)
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->join($throughTable, $throughTable . '.' . $pk . '=' . $alias . '.' . $throughKey)
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->join($modelTable, $modelTable . '.' . $this->localKey . '=' . $throughTable . '.' . $this->foreignKey)
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->where($throughTable . '.' . $this->foreignKey, $this->parent->{$this->localKey});
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$this->baseQuery = true;
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}
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}
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}
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