Doctrine substring field with alias in where clause - php

Question

I have the following query:
$query = $qb->select($qb->expr()->substring("p.website",1,5).'AS country)
->from("AppBundle\Entity\Image" ,"p")
->where("p.aktuellste = 1")
->andWhere($qb->expr()->in('country',':country'))
->setParameter(':country','de')
->orderBy('country','DESC')
->getQuery();
E.g. I would like to select all lines where substring(1,2) of website is de. But country is an unknown column for Doctrine in the WHERE clause. The following exception is thrown:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'sclr_0' in
'where clause
The funny thing is that Doctrine knows the country column in the ORDER BY clause.
Does anybody know how to fix this?

Answer 1

If you want to search on an aliased column, you need to use HAVING, because that is on a calculated field. Putting it in your WHERE clause is assuming that your Image entity has a member named country in it, which it does not.
$query = $qb
->select($qb->expr()->substring('p.website', 1, 5).'AS country')
->from('AppBundle\Entity\Image', 'p')
->andWhere('p.aktuellste = 1')
->andHaving($qb->expr()->in('country', ':country'))
->setParameter(':country', 'de')
->orderBy('country', 'DESC')
->getQuery()
;
See MySQL Handling of Group By for more information:
The MySQL extension permits the use of an alias in the HAVING clause
for the aggregated column

Answer 2

There are some syntax errors in your query, but not sure this fixes your problem.
Please try this:
$query = $qb->select($qb->expr()->substring("p.website",1,5).'AS country')
->from("AppBundle\Entity\Image" ,"p")
->where("p.aktuellste = 1")
->andWhere($qb->expr()->in('country=:country'))
->setParameter('country','de')
->orderBy('country','DESC')
->getQuery();