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<?php
namespace common\modules\relation;
use yii\base\Behavior;
use yii\base\Exception;
use yii\db\ActiveRecord;
use Yii;
use yii\helpers\ArrayHelper;
class relationBehavior extends Behavior {
/** @var array $fields Form-fields for current relations */
public $fields = [];
/** @var array $values Values for current relations */
public $values = [];
/** @var array $relations List of relations of current model */
public $relations = [];
/**
* @param ActiveRecord $owner
* @throws Exception
*/
public function attach($owner)
{
parent::attach($owner);
}
/*
* Inicialize behavior (read and prepare params)
*/
public function init() {
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foreach ($this->relations as $relation_key => &$relation) {
if (is_string($relation)) {
// Get data from module's data
$relation_entity = $relation;
$relation = $this->_getRelationParams($relation_key);
$relation['inner'] = $relation[$relation_entity];
$relation['outer'] = $relation[$relation_entity == 'entity1' ? 'entity2' : 'entity1'];
$relation['linked_table'] = $relation['via']['model']::tableName();
if (!empty($relation['via']['alias'])) {
$relation['linked_alias'] = $relation['via']['alias'];
}
}
$this->fields[$relation['field']] = $relation_key;
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}
}
/*
* Events for auto-drive relations data
*/
public function events()
{
return [
ActiveRecord::EVENT_AFTER_INSERT => 'relationsAfterSave',
ActiveRecord::EVENT_AFTER_UPDATE => 'relationsAfterSave',
ActiveRecord::EVENT_BEFORE_DELETE => 'relationBeforeDelete',
];
}
public function relationsAfterSave($insert) {
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if (is_array($modelPrimaryKey = $this->owner->getPrimaryKey())) {
throw new ErrorException('This behavior does not support composite primary keys');
}
foreach ($this->relations as $relation_key => $relation) {
if (empty($relation['field']) || !is_array($this->{$relation['field']}))
continue;
$values = $this->{$relation['field']};
/** @var ActiveRecord $model */
$model = new $relation['inner']['model'];
$connection = $model::getDb();
$transaction = $connection->beginTransaction();
$delete_where = [$relation['inner']['linked_key'] => $this->owner->{$relation['inner']['key']}];
if (!empty($relation['linked_alias'])) {
$delete_where[$relation['linked_alias']] = $relation_key;
}
try {
// Delete all links from viaTable
$connection->createCommand()
->delete
(
$relation['linked_table'],
$delete_where
)
->execute();
if (!empty($values)) {
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foreach($values as $value) {
$insertData = [
$relation['inner']['linked_key'] => $this->owner->{$relation['inner']['key']},
$relation['outer']['linked_key'] => $value
];
if (!empty($relation['linked_alias'])) {
$insertData[$relation['linked_alias']] = $relation_key;
}
$connection->createCommand()
->insert
(
$relation['linked_table'],
$insertData
)
->execute();
}
}
$transaction->commit();
// $model->link($relation_key, )
} catch (Exception $ex) {
// var_dump($relation_key, $relation);exit;
$transaction->rollback();
throw $ex;
}
}
}
public function relationBeforeDelete() {
if (is_array($modelPrimaryKey = $this->owner->getPrimaryKey())) {
throw new ErrorException('This behavior does not support composite primary keys');
}
foreach ($this->relations as $relation_key => $relation) {
if (empty($relation['field']))
continue;
$values = $this->{$relation['field']};
/** @var ActiveRecord $model */
$model = new $relation['inner']['model'];
$connection = $model::getDb();
$transaction = $connection->beginTransaction();
// @todo Refix to ActiveRecord format
try {
// Delete all links from viaTable
$connection->createCommand()
->delete
(
$relation['linked_table'],
[$relation['inner']['linked_key'] => $this->owner->{$relation['inner']['key']}]
)
->execute();
$transaction->commit();
} catch (Exception $ex) {
$transaction->rollback();
throw $ex;
}
}
}
/**
* Get related data for $relation
* @params string $relation Relation key
*/
public function getRelations($relation) {
$relation = $this->_getRelation($relation);
return
$this->owner
->hasMany($relation['outer']['model'], [$relation['outer']['key'] => $relation['outer']['linked_key']])
->viaTable($relation['linked_table'], [$relation['inner']['linked_key'] => $relation['inner']['key']]);
}
/*
* Get relation params for $relation
* @param string $relation Relation key
*/
protected function _getRelation($relation) {
$relation = strtolower($relation);
return isset($this->relations[$relation]) ? $this->relations[$relation] : null;
}
/**
* Return relation data from main app config
* @params string $section Relations key
*/
protected function _getRelationParams($section) {
$relation = relationHelper::getRelation($section);
if (!$relation)
throw new Exception('Relation "' . $section . '" not set on this application.');
return $relation;
}
protected function _getRelationNameByField($field) {
return isset($this->fields[$field]) ? $this->fields[$field] : null;
}
protected function _getRelationByField($field) {
return ( isset($this->fields[$field]) && isset($this->relations[$this->fields[$field]]) ) ? $this->relations[$this->fields[$field]] : null;
}
/**
* @inheritdoc
*/
public function canGetProperty($name, $checkVars = true)
{
return true;
}
/**
* @inheritdoc
*/
public function canSetProperty($name, $checkVars = true)
{
return array_key_exists($name, $this->fields) ?
true : parent::canSetProperty($name, $checkVars = true);
}
/**
* @inheritdoc
*/
public function __set($name, $value) {
if (isset($this->fields[$name])) {
$this->values[$name] = $value;
}
}
/**
* @inheritdoc
*/
public function __get($name) {
if (isset($this->values[$name])) {
return $this->values[$name];
} else {
$relation_key = $this->_getRelationNameByField($name);
if (!$relation_key)
return;
return $this->getRelations($relation_key);
}
}
}
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