Aliasing fields using partial object syntax + array hydrator in doctrine 2 - php

Question

Is there any way to alias fields when using partial object syntax in Doctrine 2?
I know I can do this:
$this->createQueryBuilder('user')->select([
'user.id AS id',
'user.firstName AS first_name',
'user.lastName AS last_name',
'user.email AS email',
'user.dateCreated AS date_created'
])->getQuery()->getArrayResult();
However I need to use the partial object syntax in order for doctrine to retrieve the result in a nested relational heirarchy:
$this->createQueryBuilder('team')
->select('PARTIAL team.{id, name, dateCreated}, s, PARTIAL e.{id, name}')
->innerJoin('team.session', 's')
->innerJoin('s.event', 'e')
->getQuery()->getArrayResult();
I dug around in Doctrine\ORM\Internal\Hydration\ArrayHydrator but didn't see any hooks or anything, and it doesn't look like Doctrine has a postSelect event or something that would allow me to implement my own mutation.
Thanks for any help!

Answer 1

Not very efficient, but I ended up subclassing the ArrayHydrator and mutating the keys myself.
Hopefully there is a better way, if not I hope this helps someone

Answer 2

The problem is not just about alias, it's also about bracket. Basically, Partial object syntax is very poor and does not allow aliases or brackets. It expects for a coma or the end of the list, and everything else will throw a syntax error.
I wanted to retrieve a partial object collection using a SUM() function like this
public function findByCompetition(array $competition)
{
$competitionField = $competition['field'] ?? 'Id';
$competitionValue = $competition['value'] ?? 0;
$teamsCompStatsByComp = $this->createQueryBuilder('t')
->select('partial t.{Id, competitionId, competitionOldId, teamId, teamOldId, SUM(goalsAttempted) goalsAttempted}')
->where('t.'.$competitionField.' = ?1')
->groupBy('t.teamId')
->orderBy('t.Id', 'ASC')
->setParameter('1', $competitionValue)
->getQuery()
->getResult()
;
return new ArrayCollection($teamsCompStatsByComp);
}
But got the same error
[Syntax Error] line 0, col 85: Error: Expected Doctrine\ORM\Query\Lexer::T_CLOSE_CURLY_BRACE, got '('
I had to retrieve data as an array, use IDENTITY() on Foreign Key, then manually hydrate my entities
public function findByCompetition(array $competition)
{
$competitionField = $competition['field'] ?? 'Id';
$competitionValue = $competition['value'] ?? 0;
$teamsCompStatsByComp = $this->createQueryBuilder('t')
->select('t.Id, IDENTITY(t.competitionId) competitionId, t.competitionOldId, IDENTITY(t.teamId) teamId, t.teamOldId, SUM(goalsAttempted) goalsAttempted')
->where('t.'.$competitionField.' = ?1')
->groupBy('t.teamId')
->orderBy('t.Id', 'ASC')
->setParameter('1', $competitionValue)
->getQuery()
->getResult()
;
foreach ($teamsCompStatsByComp as $key => $teamCompStats) {
$teamsCompStatsByComp[$key] = new TeamStatistics($teamCompStats);
}
return new ArrayCollection($teamsCompStatsByComp);
}
I think we should open an issue on Github to improve partial syntax behavior.