Leave out discriminator part of Doctrine' generated SQL

Question

Assume the following AbstractPage model:

/*
 *     @ORM\\Entity
 *     @ORM\\Table(name=\"page\")
 *     @ORM\\InheritanceType(\"SINGLE_TABLE\")
 *          


        

Answer 1

Here is the solution I can think out. The idea is to extend some doctrine classes to add functionality required. Keep models as they are now.

Create new class extending SqlWalker (update namespaces of course)

<?php

namespace Sad;


use Doctrine\ORM\Mapping\ClassMetadata;
use Doctrine\ORM\Query\SqlWalker;

class CustomSqlWalker extends SqlWalker
{

  const IGNORE_DISCRIMINATION = 'ignoreDiscrimination';

  /**
   * {@inheritdoc}
   */
  public function walkWhereClause($whereClause)
  {
    // Get list of aliases in which discrimination should be ignored
    $ignoreDescription = $this->getQuery()->getHint(self::IGNORE_DISCRIMINATION);
    if ($ignoreDescription !== false) {
      // For each aliases...
      foreach ($this->getQueryComponents() as $k => $component) {
        // ...check if alias is in ignore list
        if (in_array($k, $ignoreDescription)) {
          /** @var $metaObj ClassMetadata */
          $metaObj = $component['metadata'];
          // Update inheritance type to disable discrimination where
          if ($metaObj->isInheritanceTypeSingleTable()) {
            $metaObj->setInheritanceType(ClassMetadata::INHERITANCE_TYPE_NONE);
          }
        }
      }
    }
    return parent::walkWhereClause($whereClause);
  }
}

Then making query you do the following:

echo $entityManager->createQuery("SELECT p FROM \Sad\Schema\AbstractPage as p")->getSQL();
// Output: ELECT p0_.id AS id_0, p0_.name AS name_1, p0_.type AS type_2 FROM page p0_ WHERE p0_.type IN ('page', 'link')

$query = $entityManager->createQuery("SELECT p FROM \Sad\Schema\AbstractPage as p");
// Make sure query uses custom walker
$query->setHint(\Doctrine\ORM\Query::HINT_CUSTOM_OUTPUT_WALKER, 'Sad\CustomSqlWalker');
// Specify which aliases should ignore discrimination
$query->setHint(\Sad\CustomSqlWalker::IGNORE_DISCRIMINATION, array('p'));

echo $query->getSQL();
// Output: ELECT p0_.id AS id_0, p0_.name AS name_1, p0_.type AS type_2 FROM page p0_