Created
March 24, 2019 05:25
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CakePHP's SumCache (Modified CounterCache)
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<?php | |
namespace App\Model\Behavior; | |
use Cake\Datasource\EntityInterface; | |
use Cake\Event\Event; | |
use Cake\ORM\Association; | |
use Cake\ORM\Behavior; | |
use Cake\ORM\Entity; | |
/** | |
* SumCache behavior | |
* | |
* Enables models to cache the sum of a field in a given relation. | |
* | |
* $this->addBehavior('SumCache', [ | |
* 'Users' => [ | |
* 'points_count' => ['sumField' => 'points'] | |
* ] | |
* ]); | |
* | |
*/ | |
class SumCacheBehavior extends Behavior | |
{ | |
/** | |
* afterSave callback. | |
* | |
* Makes sure to update counter cache when a new record is created or updated. | |
* | |
* @param \Cake\Event\Event $event The afterSave event that was fired. | |
* @param \Cake\Datasource\EntityInterface $entity The entity that was saved. | |
* @return void | |
*/ | |
public function afterSave(Event $event, EntityInterface $entity) | |
{ | |
$this->_processAssociations($event, $entity); | |
} | |
/** | |
* afterDelete callback. | |
* | |
* Makes sure to update counter cache when a record is deleted. | |
* | |
* @param \Cake\Event\Event $event The afterDelete event that was fired. | |
* @param \Cake\Datasource\EntityInterface $entity The entity that was deleted. | |
* @return void | |
*/ | |
public function afterDelete(Event $event, EntityInterface $entity) | |
{ | |
$this->_processAssociations($event, $entity); | |
} | |
/** | |
* Iterate all associations and update counter caches. | |
* | |
* @param \Cake\Event\Event $event Event instance. | |
* @param \Cake\Datasource\EntityInterface $entity Entity. | |
* @return void | |
*/ | |
protected function _processAssociations(Event $event, EntityInterface $entity) | |
{ | |
foreach ($this->_config as $assoc => $settings) { | |
$assoc = $this->_table->association($assoc); | |
$this->_processAssociation($event, $entity, $assoc, $settings); | |
} | |
} | |
/** | |
* Updates counter cache for a single association | |
* | |
* @param \Cake\Event\Event $event Event instance. | |
* @param \Cake\Datasource\EntityInterface $entity Entity | |
* @param Association $assoc The association object | |
* @param array $settings The settings for for counter cache for this association | |
* @return void | |
*/ | |
protected function _processAssociation(Event $event, EntityInterface $entity, Association $assoc, array $settings) | |
{ | |
$foreignKeys = (array)$assoc->foreignKey(); | |
$primaryKeys = (array)$assoc->bindingKey(); | |
$countConditions = $entity->extract($foreignKeys); | |
$updateConditions = array_combine($primaryKeys, $countConditions); | |
$countOriginalConditions = $entity->extractOriginalChanged($foreignKeys); | |
if ($countOriginalConditions !== []) { | |
$updateOriginalConditions = array_combine($primaryKeys, $countOriginalConditions); | |
} | |
foreach ($settings as $field => $config) { | |
if (is_int($field)) { | |
$field = $config; | |
$config = []; | |
} | |
if (!is_string($config) && is_callable($config)) { | |
$count = $config($event, $entity, $this->_table, false, $countConditions); | |
} else { | |
$count = $this->_getCount($config, $countConditions); | |
} | |
$assoc->target()->updateAll([$field => $count], $updateConditions); | |
if (isset($updateOriginalConditions)) { | |
if (!is_string($config) && is_callable($config)) { | |
$count = $config($event, $entity, $this->_table, true, $countOriginalConditions); | |
} else { | |
$count = $this->_getCount($config, $countOriginalConditions); | |
} | |
$assoc->target()->updateAll([$field => $count], $updateOriginalConditions); | |
} | |
} | |
} | |
/** | |
* Fetches and returns the sum for a single field in an association | |
* | |
* @param array $config The counter cache configuration for a single field | |
* @param array $conditions Additional conditions given to the query | |
* @return int The number of relations matching the given config and conditions | |
*/ | |
protected function _getCount(array $config, array $conditions) | |
{ | |
$finder = 'all'; | |
if (!empty($config['finder'])) { | |
$finder = $config['finder']; | |
unset($config['finder']); | |
} | |
if (!isset($config['conditions'])) { | |
$config['conditions'] = []; | |
} | |
if (!isset($config['sumField'])) { | |
$config['sumField'] = ''; | |
} | |
$config['conditions'] = array_merge($conditions, $config['conditions']); | |
$query = $this->_table->find($finder, $config); | |
return $query->sumOf($config['sumField']); | |
} | |
} |
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