|
<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace think\model\relation;
use think\Exception;
use think\Loader;
use think\Model;
use think\model\Relation;
class MorphTo extends Relation
{
// 多态字段
protected $morphKey;
protected $morphType;
// 多态别名
protected $alias;
protected $relation;
/**
* 构造函数
* @access public
* @param Model $parent 上级模型对象
* @param string $morphType 多态字段名
* @param string $morphKey 外键名
* @param array $alias 多态别名定义
* @param string $relation 关联名
*/
public function __construct(Model $parent, $morphType, $morphKey, $alias = [], $relation = null)
{
$this->parent = $parent;
$this->morphType = $morphType;
$this->morphKey = $morphKey;
$this->alias = $alias;
$this->relation = $relation;
}
/**
* 延迟获取关联数据
* @param string $subRelation 子关联名
* @param \Closure $closure 闭包查询条件
* @return mixed
*/
public function getRelation($subRelation = '', $closure = null)
{
$morphKey = $this->morphKey;
$morphType = $this->morphType;
// 多态模型
$model = $this->parseModel($this->parent->$morphType);
// 主键数据
$pk = $this->parent->$morphKey;
$relationModel = (new $model)->relation($subRelation)->find($pk);
if ($relationModel) {
$relationModel->setParent(clone $this->parent);
}
return $relationModel;
}
/**
* 根据关联条件查询当前模型
* @access public
* @param string $operator 比较操作符
* @param integer $count 个数
* @param string $id 关联表的统计字段
* @param string $joinType JOIN类型
* @return Query
*/
public function has($operator = '>=', $count = 1, $id = '*', $joinType = 'INNER')
{
return $this->parent;
}
/**
* 根据关联条件查询当前模型
* @access public
* @param mixed $where 查询条件（数组或者闭包）
* @return Query
*/
public function hasWhere($where = [])
{
throw new Exception('relation not support: hasWhere');
}
/**
* 解析模型的完整命名空间
* @access public
* @param string $model 模型名（或者完整类名）
* @return string
*/
protected function parseModel($model)
{
if (isset($this->alias[$model])) {
$model = $this->alias[$model];
}
if (false === strpos($model, '\\')) {
$path = explode('\\', get_class($this->parent));
array_pop($path);
array_push($path, Loader::parseName($model, 1));
$model = implode('\\', $path);
}
return $model;
}
/**
* 设置多态别名
* @access public
* @param array $alias 别名定义
* @return $this
*/
public function setAlias($alias)
{
$this->alias = $alias;
return $this;
}
/**
* 移除关联查询参数
* @access public
* @return $this
*/
public function removeOption()
{
return $this;
}
/**
* 预载入关联查询
* @access public
* @param array $resultSet 数据集
* @param string $relation 当前关联名
* @param string $subRelation 子关联名
* @param \Closure $closure 闭包
* @return void
* @throws Exception
*/
public function eagerlyResultSet(&$resultSet, $relation, $subRelation, $closure)
{
$morphKey = $this->morphKey;
$morphType = $this->morphType;
$range = [];
foreach ($resultSet as $result) {
// 获取关联外键列表
if (!empty($result->$morphKey)) {
$range[$result->$morphType][] = $result->$morphKey;
}
}
if (!empty($range)) {
// 关联属性名
$attr = Loader::parseName($relation);
foreach ($range as $key => $val) {
// 多态类型映射
$model = $this->parseModel($key);
$obj = new $model;
$pk = $obj->getPk();
$list = $obj->all($val, $subRelation);
$data = [];
foreach ($list as $k => $vo) {
$data[$vo->$pk] = $vo;
}
foreach ($resultSet as $result) {
if ($key == $result->$morphType) {
// 关联模型
if (!isset($data[$result->$morphKey])) {
throw new Exception('relation data not exists :' . $this->model);
} else {
$relationModel = $data[$result->$morphKey];
$relationModel->setParent(clone $result);
$relationModel->isUpdate(true);
$result->setRelation($attr, $relationModel);
}
}
}
}
}
}
/**
* 预载入关联查询
* @access public
* @param Model $result 数据对象
* @param string $relation 当前关联名
* @param string $subRelation 子关联名
* @param \Closure $closure 闭包
* @return void
*/
public function eagerlyResult(&$result, $relation, $subRelation, $closure)
{
$morphKey = $this->morphKey;
$morphType = $this->morphType;
// 多态类型映射
$model = $this->parseModel($result->{$this->morphType});
$this->eagerlyMorphToOne($model, $relation, $result, $subRelation);
}
/**
* 关联统计
* @access public
* @param Model $result 数据对象
* @param \Closure $closure 闭包
* @return integer
*/
public function relationCount($result, $closure)
{
}
/**
* 多态MorphTo 关联模型预查询
* @access public
* @param object $model 关联模型对象
* @param string $relation 关联名
* @param $result
* @param string $subRelation 子关联
* @return void
*/
protected function eagerlyMorphToOne($model, $relation, &$result, $subRelation = '')
{
// 预载入关联查询 支持嵌套预载入
$pk = $this->parent->{$this->morphKey};
$data = (new $model)->with($subRelation)->find($pk);
if ($data) {
$data->setParent(clone $result);
$data->isUpdate(true);
}
$result->setRelation(Loader::parseName($relation), $data ?: null);
}
/**
* 添加关联数据
* @access public
* @param Model $model 关联模型对象
* @return Model
*/
public function associate($model)
{
$morphKey = $this->morphKey;
$morphType = $this->morphType;
$pk = $model->getPk();
$this->parent->setAttr($morphKey, $model->$pk);
$this->parent->setAttr($morphType, get_class($model));
$this->parent->save();
return $this->parent->setRelation($this->relation, $model);
}
/**
* 注销关联数据
* @access public
* @return Model
*/
public function dissociate()
{
$morphKey = $this->morphKey;
$morphType = $this->morphType;
$this->parent->setAttr($morphKey, null);
$this->parent->setAttr($morphType, null);
$this->parent->save();
return $this->parent->setRelation($this->relation, null);
}
/**
* 执行基础查询（进执行一次）
* @access protected
* @return void
*/
protected function baseQuery()
{}
}
|
