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yii2-nested-sets/NestedSetsBehavior.php

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<?php
/**
* @link https://github.com/paulzi/yii2-nested-sets
* @copyright Copyright (c) 2015 PaulZi <pavel.zimakoff@gmail.com>
* @license MIT (https://github.com/paulzi/yii2-nested-sets/blob/master/LICENSE)
*/
namespace paulzi\nestedsets;
use Yii;
use yii\base\Behavior;
use yii\base\Exception;
use yii\base\NotSupportedException;
use yii\db\ActiveRecord;
use yii\db\Expression;
/**
* Nested Sets Behavior for Yii2
* @author PaulZi <pavel.zimakoff@gmail.com>
* @author Alexander Kochetov <https://github.com/creocoder>
*
* @property ActiveRecord $owner
*/
class NestedSetsBehavior extends Behavior
{
const OPERATION_MAKE_ROOT = 1;
const OPERATION_PREPEND_TO = 2;
const OPERATION_APPEND_TO = 3;
const OPERATION_INSERT_BEFORE = 4;
const OPERATION_INSERT_AFTER = 5;
const OPERATION_DELETE_ALL = 6;
/**
* @var string|null
*/
public $treeAttribute;
/**
* @var string
*/
public $leftAttribute = 'lft';
/**
* @var string
*/
public $rightAttribute = 'rgt';
/**
* @var string
*/
public $depthAttribute = 'depth';
/**
* @var string|null
*/
protected $operation;
/**
* @var ActiveRecord|self|null
*/
protected $node;
/**
* @var string
*/
protected $treeChange;
/**
* @inheritdoc
*/
public function events()
{
return [
ActiveRecord::EVENT_BEFORE_INSERT => 'beforeInsert',
ActiveRecord::EVENT_AFTER_INSERT => 'afterInsert',
ActiveRecord::EVENT_BEFORE_UPDATE => 'beforeUpdate',
ActiveRecord::EVENT_AFTER_UPDATE => 'afterUpdate',
ActiveRecord::EVENT_BEFORE_DELETE => 'beforeDelete',
ActiveRecord::EVENT_AFTER_DELETE => 'afterDelete',
];
}
/**
* @param int|null $depth
* @return \yii\db\ActiveQuery
*/
public function getParents($depth = null)
{
$tableName = $this->owner->tableName();
$condition = [
'and',
['<', "{$tableName}.[[{$this->leftAttribute}]]", $this->owner->getAttribute($this->leftAttribute)],
['>', "{$tableName}.[[{$this->rightAttribute}]]", $this->owner->getAttribute($this->rightAttribute)],
];
if ($depth !== null) {
$condition[] = ['>=', "{$tableName}.[[{$this->depthAttribute}]]", $this->owner->getAttribute($this->depthAttribute) - $depth];
}
$query = $this->owner->find()
->andWhere($condition)
->andWhere($this->treeCondition())
->addOrderBy(["{$tableName}.[[{$this->leftAttribute}]]" => SORT_ASC]);
$query->multiple = true;
return $query;
}
/**
* @return \yii\db\ActiveQuery
*/
public function getParent()
{
$tableName = $this->owner->tableName();
$query = $this->getParents(1)
->orderBy(["{$tableName}.[[{$this->leftAttribute}]]" => SORT_DESC])
->limit(1);
$query->multiple = false;
return $query;
}
/**
* @return \yii\db\ActiveQuery
*/
public function getRoot()
{
$tableName = $this->owner->tableName();
$query = $this->owner->find()
->andWhere(["{$tableName}.[[{$this->leftAttribute}]]" => 1])
->andWhere($this->treeCondition())
->limit(1);
$query->multiple = false;
return $query;
}
/**
* @param int|null $depth
* @param bool $andSelf
* @param bool $backOrder
* @return \yii\db\ActiveQuery
*/
public function getDescendants($depth = null, $andSelf = false, $backOrder = false)
{
$tableName = $this->owner->tableName();
$attribute = $backOrder ? $this->rightAttribute : $this->leftAttribute;
$condition = [
'and',
[$andSelf ? '>=' : '>', "{$tableName}.[[{$attribute}]]", $this->owner->getAttribute($this->leftAttribute)],
[$andSelf ? '<=' : '<', "{$tableName}.[[{$attribute}]]", $this->owner->getAttribute($this->rightAttribute)],
];
if ($depth !== null) {
$condition[] = ['<=', "{$tableName}.[[{$this->depthAttribute}]]", $this->owner->getAttribute($this->depthAttribute) + $depth];
}
$query = $this->owner->find()
->andWhere($condition)
->andWhere($this->treeCondition())
->addOrderBy(["{$tableName}.[[{$attribute}]]" => $backOrder ? SORT_DESC : SORT_ASC]);
$query->multiple = true;
return $query;
}
/**
* @return \yii\db\ActiveQuery
*/
public function getChildren()
{
return $this->getDescendants(1);
}
/**
* @param int|null $depth
* @return \yii\db\ActiveQuery
*/
public function getLeaves($depth = null)
{
$tableName = $this->owner->tableName();
$query = $this->getDescendants($depth)
->andWhere(["{$tableName}.[[{$this->leftAttribute}]]" => new Expression("{$tableName}.[[{$this->rightAttribute}]] - 1")]);
$query->multiple = true;
return $query;
}
/**
* @return \yii\db\ActiveQuery
*/
public function getPrev()
{
$tableName = $this->owner->tableName();
$query = $this->owner->find()
->andWhere(["{$tableName}.[[{$this->rightAttribute}]]" => $this->owner->getAttribute($this->leftAttribute) - 1])
->andWhere($this->treeCondition())
->limit(1);
$query->multiple = false;
return $query;
}
/**
* @return \yii\db\ActiveQuery
*/
public function getNext()
{
$tableName = $this->owner->tableName();
$query = $this->owner->find()
->andWhere(["{$tableName}.[[{$this->leftAttribute}]]" => $this->owner->getAttribute($this->rightAttribute) + 1])
->andWhere($this->treeCondition())
->limit(1);
$query->multiple = false;
return $query;
}
/**
* @return bool
*/
public function isRoot()
{
return $this->owner->getAttribute($this->leftAttribute) === 1;
}
/**
* @param ActiveRecord $node
* @return bool
*/
public function isChildOf($node)
{
$result = $this->owner->getAttribute($this->leftAttribute) > $node->getAttribute($this->leftAttribute)
&& $this->owner->getAttribute($this->rightAttribute) < $node->getAttribute($this->rightAttribute);
if ($result && $this->treeAttribute !== null) {
$result = $this->owner->getAttribute($this->treeAttribute) === $node->getAttribute($this->treeAttribute);
}
return $result;
}
/**
* @return bool
*/
public function isLeaf()
{
return $this->owner->getAttribute($this->rightAttribute) - $this->owner->getAttribute($this->leftAttribute) === 1;
}
/**
* @return ActiveRecord
*/
public function makeRoot()
{
$this->operation = self::OPERATION_MAKE_ROOT;
return $this->owner;
}
/**
* @param ActiveRecord $node
* @return ActiveRecord
*/
public function prependTo($node)
{
$this->operation = self::OPERATION_PREPEND_TO;
$this->node = $node;
return $this->owner;
}
/**
* @param ActiveRecord $node
* @return ActiveRecord
*/
public function appendTo($node)
{
$this->operation = self::OPERATION_APPEND_TO;
$this->node = $node;
return $this->owner;
}
/**
* @param ActiveRecord $node
* @return ActiveRecord
*/
public function insertBefore($node)
{
$this->operation = self::OPERATION_INSERT_BEFORE;
$this->node = $node;
return $this->owner;
}
/**
* @param ActiveRecord $node
* @return ActiveRecord
*/
public function insertAfter($node)
{
$this->operation = self::OPERATION_INSERT_AFTER;
$this->node = $node;
return $this->owner;
}
/**
* @return bool|int
* @throws \Exception
* @throws \yii\db\Exception
*/
public function deleteWithChildren()
{
$this->operation = self::OPERATION_DELETE_ALL;
if (!$this->owner->isTransactional(ActiveRecord::OP_DELETE)) {
$transaction = $this->owner->getDb()->beginTransaction();
try {
$result = $this->deleteWithChildrenInternal();
if ($result === false) {
$transaction->rollBack();
} else {
$transaction->commit();
}
return $result;
} catch (\Exception $e) {
$transaction->rollBack();
throw $e;
}
} else {
$result = $this->deleteWithChildrenInternal();
}
return $result;
}
/**
* @throws Exception
* @throws NotSupportedException
*/
public function beforeInsert()
{
if ($this->node !== null && !$this->node->getIsNewRecord()) {
$this->node->refresh();
}
switch ($this->operation) {
case self::OPERATION_MAKE_ROOT:
$condition = array_merge([$this->leftAttribute => 1], $this->treeCondition());
if ($this->owner->findOne($condition) !== null) {
throw new Exception('Can not create more than one root.');
}
$this->owner->setAttribute($this->leftAttribute, 1);
$this->owner->setAttribute($this->rightAttribute, 2);
$this->owner->setAttribute($this->depthAttribute, 0);
break;
case self::OPERATION_PREPEND_TO:
$this->insertNode($this->node->getAttribute($this->leftAttribute) + 1, 1);
break;
case self::OPERATION_APPEND_TO:
$this->insertNode($this->node->getAttribute($this->rightAttribute), 1);
break;
case self::OPERATION_INSERT_BEFORE:
$this->insertNode($this->node->getAttribute($this->leftAttribute), 0);
break;
case self::OPERATION_INSERT_AFTER:
$this->insertNode($this->node->getAttribute($this->rightAttribute) + 1, 0);
break;
default:
throw new NotSupportedException('Method "'. $this->owner->className() . '::insert" is not supported for inserting new nodes.');
}
}
/**
* @throws Exception
*/
public function afterInsert()
{
if ($this->operation === self::OPERATION_MAKE_ROOT && $this->treeAttribute !== null && $this->owner->getAttribute($this->treeAttribute) === null) {
$id = $this->owner->getPrimaryKey();
$this->owner->setAttribute($this->treeAttribute, $id);
$primaryKey = $this->owner->primaryKey();
if (!isset($primaryKey[0])) {
throw new Exception('"' . $this->owner->className() . '" must have a primary key.');
}
$this->owner->updateAll([$this->treeAttribute => $id], [$primaryKey[0] => $id]);
}
$this->operation = null;
$this->node = null;
}
/**
* @throws Exception
*/
public function beforeUpdate()
{
if ($this->node !== null && !$this->node->getIsNewRecord()) {
$this->node->refresh();
}
switch ($this->operation) {
case self::OPERATION_MAKE_ROOT:
if ($this->treeAttribute === null) {
throw new Exception('Can not move a node as the root when "treeAttribute" is not set.');
}
if ($this->owner->getOldAttribute($this->treeAttribute) !== $this->owner->getAttribute($this->treeAttribute)) {
$this->treeChange = $this->owner->getAttribute($this->treeAttribute);
$this->owner->setAttribute($this->treeAttribute, $this->owner->getOldAttribute($this->treeAttribute));
}
break;
case self::OPERATION_INSERT_BEFORE:
case self::OPERATION_INSERT_AFTER:
if ($this->node->isRoot()) {
throw new Exception('Can not move a node before/after root.');
}
case self::OPERATION_PREPEND_TO:
case self::OPERATION_APPEND_TO:
if ($this->node->getIsNewRecord()) {
throw new Exception('Can not move a node when the target node is new record.');
}
if ($this->owner->equals($this->node)) {
throw new Exception('Can not move a node when the target node is same.');
}
if ($this->node->isChildOf($this->owner)) {
throw new Exception('Can not move a node when the target node is child.');
}
}
}
/**
*
*/
public function afterUpdate()
{
switch ($this->operation) {
case self::OPERATION_MAKE_ROOT:
$this->moveNodeAsRoot();
break;
case self::OPERATION_PREPEND_TO:
$this->moveNode($this->node->getAttribute($this->leftAttribute) + 1, 1);
break;
case self::OPERATION_APPEND_TO:
$this->moveNode($this->node->getAttribute($this->rightAttribute), 1);
break;
case self::OPERATION_INSERT_BEFORE:
$this->moveNode($this->node->getAttribute($this->leftAttribute), 0);
break;
case self::OPERATION_INSERT_AFTER:
$this->moveNode($this->node->getAttribute($this->rightAttribute) + 1, 0);
break;
}
$this->operation = null;
$this->node = null;
$this->treeChange = null;
}
/**
* @throws Exception
*/
public function beforeDelete()
{
if ($this->owner->getIsNewRecord()) {
throw new Exception('Can not delete a node when it is new record.');
}
if ($this->isRoot() && $this->operation !== self::OPERATION_DELETE_ALL) {
throw new Exception('Method "'. $this->owner->className() . '::delete" is not supported for deleting root nodes.');
}
$this->owner->refresh();
}
/**
*
*/
public function afterDelete()
{
$left = $this->owner->getAttribute($this->leftAttribute);
$right = $this->owner->getAttribute($this->rightAttribute);
if ($this->operation === static::OPERATION_DELETE_ALL || $this->isLeaf()) {
$this->shift($right + 1, null, $left - $right - 1);
} else {
$this->owner->updateAll(
[
$this->leftAttribute => new Expression("[[{$this->leftAttribute}]] - 1"),
$this->rightAttribute => new Expression("[[{$this->rightAttribute}]] - 1"),
$this->depthAttribute => new Expression("[[{$this->depthAttribute}]] - 1"),
],
$this->getDescendants()->where
);
$this->shift($right + 1, null, -2);
}
$this->operation = null;
$this->node = null;
}
/**
* @return int
*/
protected function deleteWithChildrenInternal()
{
if (!$this->owner->beforeDelete()) {
return false;
}
$result = $this->owner->deleteAll($this->getDescendants(null, true)->where);
$this->owner->setOldAttributes(null);
$this->owner->afterDelete();
return $result;
}
/**
* @param int $to
* @param int $depth
* @throws Exception
*/
protected function insertNode($to, $depth = 0)
{
if ($this->node->getIsNewRecord()) {
throw new Exception('Can not create a node when the target node is new record.');
}
if ($depth === 0 && $this->node->isRoot()) {
throw new Exception('Can not insert a node before/after root.');
}
$this->owner->setAttribute($this->leftAttribute, $to);
$this->owner->setAttribute($this->rightAttribute, $to + 1);
$this->owner->setAttribute($this->depthAttribute, $this->node->getAttribute($this->depthAttribute) + $depth);
if ($this->treeAttribute !== null) {
$this->owner->setAttribute($this->treeAttribute, $this->node->getAttribute($this->treeAttribute));
}
$this->shift($to, null, 2);
}
/**
* @param int $to
* @param int $depth
* @throws Exception
*/
protected function moveNode($to, $depth = 0)
{
$left = $this->owner->getAttribute($this->leftAttribute);
$right = $this->owner->getAttribute($this->rightAttribute);
$depth = $this->owner->getAttribute($this->depthAttribute) - $this->node->getAttribute($this->depthAttribute) - $depth;
if ($this->treeAttribute === null || $this->owner->getAttribute($this->treeAttribute) === $this->node->getAttribute($this->treeAttribute)) {
// same root
$this->owner->updateAll(
[$this->depthAttribute => new Expression("-[[{$this->depthAttribute}]]" . sprintf('%+d', $depth))],
$this->getDescendants(null, true)->where
);
$delta = $right - $left + 1;
if ($left >= $to) {
$this->shift($to, $left - 1, $delta);
$delta = $to - $left;
} else {
$this->shift($right + 1, $to - 1, -$delta);
$delta = $to - $right - 1;
}
$this->owner->updateAll(
[
$this->leftAttribute => new Expression("[[{$this->leftAttribute}]]" . sprintf('%+d', $delta)),
$this->rightAttribute => new Expression("[[{$this->rightAttribute}]]" . sprintf('%+d', $delta)),
$this->depthAttribute => new Expression("-[[{$this->depthAttribute}]]"),
],
[
'and',
$this->getDescendants(null, true)->where,
['<', $this->depthAttribute, 0],
]
);
} else {
// move from other root
$tree = $this->node->getAttribute($this->treeAttribute);
$this->shift($to, null, $right - $left + 1, $tree);
$delta = $to - $left;
$this->owner->updateAll(
[
$this->leftAttribute => new Expression("[[{$this->leftAttribute}]]" . sprintf('%+d', $delta)),
$this->rightAttribute => new Expression("[[{$this->rightAttribute}]]" . sprintf('%+d', $delta)),
$this->depthAttribute => new Expression("[[{$this->depthAttribute}]]" . sprintf('%+d', -$depth)),
$this->treeAttribute => $tree,
],
$this->getDescendants(null, true)->where
);
$this->shift($right + 1, null, $left - $right - 1);
}
}
/**
*
*/
protected function moveNodeAsRoot()
{
$left = $this->owner->getAttribute($this->leftAttribute);
$right = $this->owner->getAttribute($this->rightAttribute);
$depth = $this->owner->getAttribute($this->depthAttribute);
$tree = $this->treeChange ? $this->treeChange : $this->owner->getPrimaryKey();
$this->owner->updateAll(
[
$this->leftAttribute => new Expression("[[{$this->leftAttribute}]]" . sprintf('%+d', 1 - $left)),
$this->rightAttribute => new Expression("[[{$this->rightAttribute}]]" . sprintf('%+d', 1 - $left)),
$this->depthAttribute => new Expression("[[{$this->depthAttribute}]]" . sprintf('%+d', -$depth)),
$this->treeAttribute => $tree,
],
$this->getDescendants(null, true)->where
);
$this->shift($right + 1, null, $left - $right - 1);
}
/**
* @param int $from
* @param int $to
* @param int $delta
* @param int|null $tree
*/
protected function shift($from, $to, $delta, $tree = null)
{
if ($delta !== 0 && ($to === null || $to >= $from)) {
if ($this->treeAttribute !== null && $tree === null) {
$tree = $this->owner->getAttribute($this->treeAttribute);
}
foreach ([$this->leftAttribute, $this->rightAttribute] as $i => $attribute) {
$this->owner->updateAll(
[$attribute => new Expression("[[{$attribute}]]" . sprintf('%+d', $delta))],
[
'and',
$to === null ? ['>=', $attribute, $from] : ['between', $attribute, $from, $to],
$this->treeAttribute !== null ? [$this->treeAttribute => $tree] : [],
]
);
}
}
}
/**
* @return array
*/
protected function treeCondition()
{
$tableName = $this->owner->tableName();
if ($this->treeAttribute === null) {
return [];
} else {
return ["{$tableName}.[[{$this->treeAttribute}]]" => $this->owner->getAttribute($this->treeAttribute)];
}
}
}