Cakephp 3中的特征和行为有什么区别？

我发现在通过特性实现的cakephp 3中实现了软删除。我尝试通过行为来实现它。但是与特征版本不同，SoftDeleteBehavior不起作用。我的模型初始化方法中有以下代码行：

$this->addBehavior('SoftDelete');

这是我的SoftDeleteBehavior

namespace App\Model\Behavior;

use Cake\ORM\Behavior;
use Cake\ORM\RulesChecker;
use Cake\Datasource\EntityInterface;
use App\Model\Behavior\MyQuery;

class SoftDeleteBehavior extends Behavior {

public $user_id = 1;

public function getDeleteDate() {
    return isset($this->deleteDate) ? $this->deleteDate : 'deleted';
}

public function getDeleter() {
    return isset($this->deleter) ? $this->deleter : 'deleter_id';
}

public function query() {
    return new MyQuery($this->connection(), $this);
}

/**
 * Perform the delete operation.
 *
 * Will soft delete the entity provided. Will remove rows from any
 * dependent associations, and clear out join tables for BelongsToMany associations.
 *
 * @param \Cake\DataSource\EntityInterface $entity The entity to soft delete.
 * @param \ArrayObject $options The options for the delete.
 * @throws \InvalidArgumentException if there are no primary key values of the
 * passed entity
 * @return bool success
 */
protected function _processDelete($entity, $options) {
    if ($entity->isNew()) {
        return false;
    }

    $primaryKey = (array)$this->primaryKey();
    if (!$entity->has($primaryKey)) {
        $msg = 'Deleting requires all primary key values.';
        throw new \InvalidArgumentException($msg);
    }

    if (isset($options['checkRules']) && !$this->checkRules($entity, RulesChecker::DELETE, $options)) {
        return false;
    }

    $event = $this->dispatchEvent('Model.beforeDelete', [
        'entity' => $entity,
        'options' => $options
    ]);

    if ($event->isStopped()) {
        return $event->result;
    }

    $this->_associations->cascadeDelete(
        $entity,
        ['_primary' => false] + $options->getArrayCopy()
    );

    $query = $this->query();
    $conditions = (array)$entity->extract($primaryKey);
    $statement = $query->update()
        ->set([$this->getDeleteDate() => date('Y-m-d H:i:s') , $this->getDeleter() => $this->user_id])
        ->where($conditions)
        ->execute();

    $success = $statement->rowCount() > 0;
    if (!$success) {
        return $success;
    }

    $this->dispatchEvent('Model.afterDelete', [
        'entity' => $entity,
        'options' => $options
    ]);

    return $success;
}

如果我使用trait，SoftDeleteTrait会以真实的方式工作。但是SoftDeleteBehavior无法正常工作！