I'm using the following code in the query builder, to select an average of score values, and the category entity to which that average belongs:
$queryBuilder = $this->createQueryBuilder('s')
->resetDQLPart('select')
->select('AVG(s.score) as score, partial c.{reviewCategoryID} as cat')
->setParameter('status', ReviewStatusType::ACCEPTED)
->join('s.review', 'r')
->join('s.category', 'c')
->where('r.campsite = :campsite')
->andWhere('r.status = :status')
->setParameter('campsite', $campsite)
->groupBy('c.reviewCategoryID');
$campsite
is an entity to which a review belongs, while scores belong to a review, and scores have a category.
But when I try to execute this, i get the error
Error: Cannot select entity through identification variables without choosing at least one root entity alias.
When I debug and I check the root aliases, I see that 's' is defined, which is should be the root entity (Score).
Any idea what could be wrong?
createQueryBuilder() can only take a parameter when it is called from the repository of the matching entity. In case you do not call it from this repository you should define a from method.
->from('YourMappingSpace:Campsite', 's')
Passing a parameter to createQueryBuilder() is for conveniance anyway. You can always define it manually. The function looks like this (Only inside the entity repository):
public function createQueryBuilder($alias)
{
return $this->_em->createQueryBuilder()
->select($alias)
->from($this->_entityName, $alias);
}
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