Doctrine: Cannot select entity through identification variables without choosing at least one root entity alias

Question

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:

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Answer 1

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);
}