/**
* Resolve DQL alias into class metadata
*
* @param AbstractQuery $query
* @param string $alias
* @return array | null
*/
protected function getEntityFromAlias(AbstractQuery $query, $alias = null)
{
$em = $query->getEntityManager();
$ast = $query->getAST();
$fromClause = $ast->fromClause;
foreach ($fromClause->identificationVariableDeclarations as $root) {
$className = $root->rangeVariableDeclaration->abstractSchemaName;
$classAlias = $root->rangeVariableDeclaration->aliasIdentificationVariable;
if ($classAlias == $alias || null === $alias) {
return array('alias' => $classAlias, 'metadata' => $em->getClassMetadata($className));
} else {
foreach ($root->joins as $join) {
$joinAlias = $join->joinAssociationDeclaration->aliasIdentificationVariable;
$joinField = $join->joinAssociationDeclaration->joinAssociationPathExpression->associationField;
if ($joinAlias == $alias) {
$metadata = $em->getClassMetadata($className);
$joinName = $metadata->associationMappings[$joinField]['targetEntity'];
return array('alias' => $joinAlias, 'metadata' => $em->getClassMetadata($joinName));
}
}
}
}
}
