/**
* Builds and returns the source to build a join for a m:n relation.
*
* @param DomainObjectInterface $parentObject
* @param string $propertyName
* @return \TYPO3\CMS\Extbase\Persistence\Generic\Qom\SourceInterface $source
*/
protected function getSource(DomainObjectInterface $parentObject, $propertyName)
{
$columnMap = $this->getDataMap(get_class($parentObject))->getColumnMap($propertyName);
$left = $this->qomFactory->selector(null, $columnMap->getRelationTableName());
$childClassName = $this->getType(get_class($parentObject), $propertyName);
$right = $this->qomFactory->selector($childClassName, $columnMap->getChildTableName());
$joinCondition = $this->qomFactory->equiJoinCondition($columnMap->getRelationTableName(), $columnMap->getChildKeyFieldName(), $columnMap->getChildTableName(), 'uid');
$source = $this->qomFactory->join($left, $right, Persistence\Generic\Query::JCR_JOIN_TYPE_INNER, $joinCondition);
return $source;
}
