Soft deleteable filter

config.yml

# Doctrine Configuration
doctrine:
    orm:
        filters:
            softdeleteable:
                class: Acme\MyBundle\ORM\Filter\SoftDeleteableFilter
                enabled: true

SoftDeleteableFilter.php

<?php

/**
 * This is an adaptation of the same filter used in the Doctrine2 Behaviours package found here: 
 * https://github.com/Atlantic18/DoctrineExtensions
 * 
 * It is a simplified filter made for use with the KnpLabs Doctrine Behaviours package found here:
 * https://github.com/KnpLabs/DoctrineBehaviors
 * (as this package doesn't include a filter)
 * 
 * All credit for this goes to 
 * 
 * @author Gustavo Falco <[email protected]>
 * @author Gediminas Morkevicius <[email protected]>
 * @author Patrik Votoček <[email protected]>
 * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
 * 
 * Adaptation of this filter:
 * https://github.com/Atlantic18/DoctrineExtensions/blob/master/lib/Gedmo/SoftDeleteable/Filter/SoftDeleteableFilter.php
 */

namespace Acme\MyBundle\ORM\Filter;

use Doctrine\ORM\Mapping\ClassMetaData;
use Doctrine\ORM\Query\Filter\SQLFilter;

class SoftDeleteableFilter extends SQLFilter
{
    protected $entityManager;
    protected $disabled = array();

    /**
     * Add the soft deletable filter
     *
     * @param  ClassMetaData $targetEntity
     * @param                $targetTableAlias
     * @return string
     */
    public function addFilterConstraint(ClassMetadata $targetEntity, $targetTableAlias)
    {
        $class = $targetEntity->getName();
        if (array_key_exists($class, $this->disabled) && $this->disabled[$class] === true) {
            return '';
        } elseif (
            array_key_exists($targetEntity->rootEntityName, $this->disabled)
            && $this->disabled[$targetEntity->rootEntityName] === true
        ) {
            return '';
        } elseif (!$targetEntity->hasField('deletedAt')) {
            return '';
        }

        $conn     = $this->getEntityManager()->getConnection();
        $platform = $conn->getDatabasePlatform();
        $column   = $targetEntity->getQuotedColumnName('deletedAt', $platform);

        $addCondSql = $platform->getIsNullExpression($targetTableAlias.'.'.$column);

        return $addCondSql;
    }

    protected function getEntityManager()
    {
        if ($this->entityManager === null) {
            $refl = new \ReflectionProperty('Doctrine\ORM\Query\Filter\SQLFilter', 'em');
            $refl->setAccessible(true);
            $this->entityManager = $refl->getValue($this);
        }

        return $this->entityManager;
    }

    public function disableForEntity($class)
    {
        $this->disabled[$class] = true;
    }

    public function enableForEntity($class)
    {
        $this->disabled[$class] = false;
    }
}