BelongsTo.php
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<?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\Loader;
use think\Model;
class BelongsTo extends OneToOne
{
/**
* 架构函数
* @access public
* @param Model $parent 上级模型对象
* @param string $model 模型名
* @param string $foreignKey 关联外键
* @param string $localKey 关联主键
* @param string $joinType JOIN类型
*/
public function __construct(Model $parent, $model, $foreignKey, $localKey, $joinType = 'INNER')
{
$this->parent = $parent;
$this->model = $model;
$this->foreignKey = $foreignKey;
$this->localKey = $localKey;
$this->joinType = $joinType;
$this->query = (new $model)->db();
}
/**
* 延迟获取关联数据
* @param string $subRelation 子关联名
* @param \Closure $closure 闭包查询条件
* @access public
* @return array|false|\PDOStatement|string|Model
*/
public function getRelation($subRelation = '', $closure = null)
{
$foreignKey = $this->foreignKey;
if ($closure) {
call_user_func_array($closure, [ & $this->query]);
}
return $this->query->where($this->localKey, $this->parent->$foreignKey)->relation($subRelation)->find();
}
/**
* 预载入关联查询（数据集）
* @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 $closure 闭包
* @return void
*/
protected function eagerlySet(&$resultSet, $relation, $subRelation, $closure)
{
$localKey = $this->localKey;
$foreignKey = $this->foreignKey;
$range = [];
foreach ($resultSet as $result) {
// 获取关联外键列表
if (isset($result->$foreignKey)) {
$range[] = $result->$foreignKey;
}
}
if (!empty($range)) {
$data = $this->eagerlyWhere($this, [
$localKey => [
'in',
$range,
],
], $localKey, $relation, $subRelation, $closure);
// 关联属性名
$attr = Loader::parseName($relation);
// 关联数据封装
foreach ($resultSet as $result) {
// 关联模型
if (!isset($data[$result->$localKey])) {
$relationModel = null;
} else {
$relationModel = $data[$result->$localKey];
}
if ($relationModel && !empty($this->bindAttr)) {
// 绑定关联属性
$this->bindAttr($relationModel, $result, $this->bindAttr);
}
// 设置关联属性
$result->setAttr($attr, $relationModel);
}
}
}
/**
* 预载入关联查询（数据）
* @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 $closure 闭包
* @return void
*/
protected function eagerlyOne(&$result, $relation, $subRelation, $closure)
{
$localKey = $this->localKey;
$foreignKey = $this->foreignKey;
$data = $this->eagerlyWhere($this, [$localKey => $result->$foreignKey], $localKey, $relation, $subRelation, $closure);
// 关联模型
if (!isset($data[$result->$localKey])) {
$relationModel = null;
} else {
$relationModel = $data[$result->$localKey];
}
if ($relationModel && !empty($this->bindAttr)) {
// 绑定关联属性
$this->bindAttr($relationModel, $result, $this->bindAttr);
}
// 设置关联属性
$result->setAttr(Loader::parseName($relation), $relationModel);
}
}