How to write sub-query in symfony doctrine?

@jasen 

To write a subquery in Symfony Doctrine, you can use the createQueryBuilder() method to create a query builder object and then use the select() and addSelect() methods to build the subquery.

Here is an example of how to write a subquery in Symfony Doctrine:

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$subquery = $this->createQueryBuilder('sq')
    ->select('sq.id')
    ->from('AppBundle:Entity', 'e')
    ->where('e.field = :value')
    ->setParameter('value', 'somevalue')
    ->getDQL();

$query = $this->createQueryBuilder('q')
    ->select('q.id')
    ->from('AppBundle:Entity', 'e')
    ->where($this->expr()->in('e.id', $subquery))
    ->getQuery()
    ->getResult();

In this example, we first create a subquery by using the createQueryBuilder() method and selecting the ID from the entity where a specific field has a certain value. We then use the getDQL() method to get the DQL string of the subquery.

Next, we create the main query by using the createQueryBuilder() method again and selecting the ID from the entity where the ID is in the subquery's result set.

Finally, we execute the main query and retrieve the result. This is an example of how you can write a subquery in Symfony Doctrine.