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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\Collection;
use think\db\Query;
use think\Exception;
use think\Loader;
use think\Model;
use think\model\Pivot;
use think\model\Relation;
use think\Paginator;
class BelongsToMany extends Relation
{
// 中间表表名
protected $middle;
// 中间表模型名称
protected $pivotName;
// 中间表模型对象
protected $pivot;
/**
* 构造函数
* @access public
* @param Model $parent 上级模型对象
* @param string $model 模型名
* @param string $table 中间表名
* @param string $foreignKey 关联模型外键
* @param string $localKey 当前模型关联键
*/
public function __construct(Model $parent, $model, $table, $foreignKey, $localKey)
{
$this->parent = $parent;
$this->model = $model;
$this->foreignKey = $foreignKey;
$this->localKey = $localKey;
if (false !== strpos($table, '\\')) {
$this->pivotName = $table;
$this->middle = basename(str_replace('\\', '/', $table));
} else {
$this->middle = $table;
}
$this->query = (new $model)->db();
$this->pivot = $this->newPivot();
}
/**
* 设置中间表模型
* @param $pivot
* @return $this
*/
public function pivot($pivot)
{
$this->pivotName = $pivot;
return $this;
}
/**
* 实例化中间表模型
* @param $data
* @return mixed
*/
protected function newPivot($data = [])
{
$pivot = $this->pivotName ?: '\\think\\model\\Pivot';
return new $pivot($this->parent, $data, $this->middle);
}
/**
* 合成中间表模型
* @param array|Collection|Paginator $models
*/
protected function hydratePivot($models)
{
foreach ($models as $model) {
$pivot = [];
foreach ($model->getData() as $key => $val) {
if (strpos($key, '__')) {
list($name, $attr) = explode('__', $key, 2);
if ('pivot' == $name) {
$pivot[$attr] = $val;
unset($model->$key);
}
}
}
$model->setRelation('pivot', $this->newPivot($pivot));
}
}
/**
* 创建关联查询Query对象
* @return Query
*/
protected function buildQuery()
{
$foreignKey = $this->foreignKey;
$localKey = $this->localKey;
$pk = $this->parent->getPk();
// 关联查询
$condition['pivot.' . $localKey] = $this->parent->$pk;
return $this->belongsToManyQuery($foreignKey, $localKey, $condition);
}
/**
* 延迟获取关联数据
* @param string $subRelation 子关联名
* @param \Closure $closure 闭包查询条件
* @return false|\PDOStatement|string|\think\Collection
*/
public function getRelation($subRelation = '', $closure = null)
{
if ($closure) {
call_user_func_array($closure, [ & $this->query]);
}
$result = $this->buildQuery()->relation($subRelation)->select();
$this->hydratePivot($result);
return $result;
}
/**
* 重载select方法
* @param null $data
* @return false|\PDOStatement|string|Collection
*/
public function select($data = null)
{
$result = $this->buildQuery()->select($data);
$this->hydratePivot($result);
return $result;
}
/**
* 重载paginate方法
* @param null $listRows
* @param bool $simple
* @param array $config
* @return Paginator
*/
public function paginate($listRows = null, $simple = false, $config = [])
{
$result = $this->buildQuery()->paginate($listRows, $simple, $config);
$this->hydratePivot($result);
return $result;
}
/**
* 重载find方法
* @param null $data
* @return array|false|\PDOStatement|string|Model
*/
public function find($data = null)
{
$result = $this->buildQuery()->find($data);
if ($result) {
$this->hydratePivot([$result]);
}
return $result;
}
/**
* 查找多条记录 如果不存在则抛出异常
* @access public
* @param array|string|Query|\Closure $data
* @return array|\PDOStatement|string|Model
*/
public function selectOrFail($data = null)
{
return $this->failException(true)->select($data);
}
/**
* 查找单条记录 如果不存在则抛出异常
* @access public
* @param array|string|Query|\Closure $data
* @return array|\PDOStatement|string|Model
*/
public function findOrFail($data = null)
{
return $this->failException(true)->find($data);
}
/**
* 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 $where 查询条件（数组或者闭包）
* @return Query
* @throws Exception
*/
public function hasWhere($where = [])
{
throw new Exception('relation not support: hasWhere');
}
/**
* 设置中间表的查询条件
* @param $field
* @param null $op
* @param null $condition
* @return $this
*/
public function wherePivot($field, $op = null, $condition = null)
{
$field = 'pivot.' . $field;
$this->query->where($field, $op, $condition);
return $this;
}
/**
* 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 $closure 闭包
* @return void
*/
public function eagerlyResultSet(&$resultSet, $relation, $subRelation, $closure)
{
$localKey = $this->localKey;
$foreignKey = $this->foreignKey;
$pk = $resultSet[0]->getPk();
$range = [];
foreach ($resultSet as $result) {
// 获取关联外键列表
if (isset($result->$pk)) {
$range[] = $result->$pk;
}
}
if (!empty($range)) {
// 查询关联数据
$data = $this->eagerlyManyToMany([
'pivot.' . $localKey => [
'in',
$range,
],
], $relation, $subRelation);
// 关联属性名
$attr = Loader::parseName($relation);
// 关联数据封装
foreach ($resultSet as $result) {
if (!isset($data[$result->$pk])) {
$data[$result->$pk] = [];
}
$result->setRelation($attr, $this->resultSetBuild($data[$result->$pk]));
}
}
}
/**
* 预载入关联查询（单个数据）
* @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 $closure 闭包
* @return void
*/
public function eagerlyResult(&$result, $relation, $subRelation, $closure)
{
$pk = $result->getPk();
if (isset($result->$pk)) {
$pk = $result->$pk;
// 查询管理数据
$data = $this->eagerlyManyToMany(['pivot.' . $this->localKey => $pk], $relation, $subRelation);
// 关联数据封装
if (!isset($data[$pk])) {
$data[$pk] = [];
}
$result->setRelation(Loader::parseName($relation), $this->resultSetBuild($data[$pk]));
}
}
/**
* 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)
{
$pk = $result->getPk();
$count = 0;
if (isset($result->$pk)) {
$pk = $result->$pk;
$count = $this->belongsToManyQuery($this->foreignKey, $this->localKey, ['pivot.' . $this->localKey => $pk])->count();
}
return $count;
}
/**
* 获取关联统计子查询
* @access public
* @param \Closure $closure 闭包
* @return string
*/
public function getRelationCountQuery($closure)
{
return $this->belongsToManyQuery($this->foreignKey, $this->localKey, [
'pivot.' . $this->localKey => [
'exp',
'=' . $this->parent->getTable() . '.' . $this->parent->getPk(),
],
])->fetchSql()->count();
}
/**
* 多对多 关联模型预查询
* @access public
* @param array $where 关联预查询条件
* @param string $relation 关联名
* @param string $subRelation 子关联
* @return array
*/
protected function eagerlyManyToMany($where, $relation, $subRelation = '')
{
// 预载入关联查询 支持嵌套预载入
$list = $this->belongsToManyQuery($this->foreignKey, $this->localKey, $where)->with($subRelation)->select();
// 组装模型数据
$data = [];
foreach ($list as $set) {
$pivot = [];
foreach ($set->getData() as $key => $val) {
if (strpos($key, '__')) {
list($name, $attr) = explode('__', $key, 2);
if ('pivot' == $name) {
$pivot[$attr] = $val;
unset($set->$key);
}
}
}
$set->setRelation('pivot', $this->newPivot($pivot));
$data[$pivot[$this->localKey]][] = $set;
}
return $data;
}
/**
* BELONGS TO MANY 关联查询
* @access public
* @param string $foreignKey 关联模型关联键
* @param string $localKey 当前模型关联键
* @param array $condition 关联查询条件
* @return Query
*/
protected function belongsToManyQuery($foreignKey, $localKey, $condition = [])
{
// 关联查询封装
$tableName = $this->query->getTable();
$table = $this->pivot->getTable();
$fields = $this->getQueryFields($tableName);
$query = $this->query->field($fields)
->field(true, false, $table, 'pivot', 'pivot__');
if (empty($this->baseQuery)) {
$relationFk = $this->query->getPk();
$query->join($table . ' pivot', 'pivot.' . $foreignKey . '=' . $tableName . '.' . $relationFk)
->where($condition);
}
return $query;
}
/**
* 保存（新增）当前关联数据对象
* @access public
* @param mixed $data 数据 可以使用数组 关联模型对象 和 关联对象的主键
* @param array $pivot 中间表额外数据
* @return integer
*/
public function save($data, array $pivot = [])
{
// 保存关联表/中间表数据
return $this->attach($data, $pivot);
}
/**
* 批量保存当前关联数据对象
* @access public
* @param array $dataSet 数据集
* @param array $pivot 中间表额外数据
* @param bool $samePivot 额外数据是否相同
* @return integer
*/
public function saveAll(array $dataSet, array $pivot = [], $samePivot = false)
{
$result = false;
foreach ($dataSet as $key => $data) {
if (!$samePivot) {
$pivotData = isset($pivot[$key]) ? $pivot[$key] : [];
} else {
$pivotData = $pivot;
}
$result = $this->attach($data, $pivotData);
}
return $result;
}
/**
* 附加关联的一个中间表数据
* @access public
* @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
* @param array $pivot 中间表额外数据
* @return array|Pivot
* @throws Exception
*/
public function attach($data, $pivot = [])
{
if (is_array($data)) {
if (key($data) === 0) {
$id = $data;
} else {
// 保存关联表数据
$model = new $this->model;
$model->save($data);
$id = $model->getLastInsID();
}
} elseif (is_numeric($data) || is_string($data)) {
// 根据关联表主键直接写入中间表
$id = $data;
} elseif ($data instanceof Model) {
// 根据关联表主键直接写入中间表
$relationFk = $data->getPk();
$id = $data->$relationFk;
}
if ($id) {
// 保存中间表数据
$pk = $this->parent->getPk();
$pivot[$this->localKey] = $this->parent->$pk;
$ids = (array) $id;
foreach ($ids as $id) {
$pivot[$this->foreignKey] = $id;
$this->pivot->insert($pivot, true);
$result[] = $this->newPivot($pivot);
}
if (count($result) == 1) {
// 返回中间表模型对象
$result = $result[0];
}
return $result;
} else {
throw new Exception('miss relation data');
}
}
/**
* 解除关联的一个中间表数据
* @access public
* @param integer|array $data 数据 可以使用关联对象的主键
* @param bool $relationDel 是否同时删除关联表数据
* @return integer
*/
public function detach($data = null, $relationDel = false)
{
if (is_array($data)) {
$id = $data;
} elseif (is_numeric($data) || is_string($data)) {
// 根据关联表主键直接写入中间表
$id = $data;
} elseif ($data instanceof Model) {
// 根据关联表主键直接写入中间表
$relationFk = $data->getPk();
$id = $data->$relationFk;
}
// 删除中间表数据
$pk = $this->parent->getPk();
$pivot[$this->localKey] = $this->parent->$pk;
if (isset($id)) {
$pivot[$this->foreignKey] = is_array($id) ? ['in', $id] : $id;
}
$this->pivot->where($pivot)->delete();
// 删除关联表数据
if (isset($id) && $relationDel) {
$model = $this->model;
$model::destroy($id);
}
}
/**
* 数据同步
* @param array $ids
* @param bool $detaching
* @return array
*/
public function sync($ids, $detaching = true)
{
$changes = [
'attached' => [],
'detached' => [],
'updated' => [],
];
$pk = $this->parent->getPk();
$current = $this->pivot->where($this->localKey, $this->parent->$pk)
->column($this->foreignKey);
$records = [];
foreach ($ids as $key => $value) {
if (!is_array($value)) {
$records[$value] = [];
} else {
$records[$key] = $value;
}
}
$detach = array_diff($current, array_keys($records));
if ($detaching && count($detach) > 0) {
$this->detach($detach);
$changes['detached'] = $detach;
}
foreach ($records as $id => $attributes) {
if (!in_array($id, $current)) {
$this->attach($id, $attributes);
$changes['attached'][] = $id;
} elseif (count($attributes) > 0 &&
$this->attach($id, $attributes)
) {
$changes['updated'][] = $id;
}
}
return $changes;
}
/**
* 执行基础查询（进执行一次）
* @access protected
* @return void
*/
protected function baseQuery()
{
if (empty($this->baseQuery) && $this->parent->getData()) {
$pk = $this->parent->getPk();
$table = $this->pivot->getTable();
$this->query->join($table . ' pivot', 'pivot.' . $this->foreignKey . '=' . $this->query->getTable() . '.' . $this->query->getPk())->where('pivot.' . $this->localKey, $this->parent->$pk);
$this->baseQuery = true;
}
}
}
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