Unknown column in createFormBuilder - forms

Question

When I try to render a form, I'm getting an error that says "Unknown column u0_.id in on clause" refering to u.id. But id property and getter is defined for User entity. So, what is happening then?
$form = $this->createFormBuilder()
->add('banish', 'entity', array(
'label' => $this->trans("Usuarios a expulsar"),
'class' => 'Pro\UserBundle\Entity\User',
'query_builder' => function(EntityRepository $er) use ($page){
return $er->createQueryBuilder('User')
->select('u')
->from('Pro\UserBundle\Entity\User', 'u')
->innerjoin('Pro\MembershipBundle\Entity\Membership', 'm', 'WITH', 'u.id = m.user')
->where( 'm.community = :community')
->setParameter('community', $page['community']);
},
))
->getForm();

Answer 1

Lets have a look at the original function createQueryBuilder() body which belongs from Doctrine\ORM\EntityRepository ,Reference EntityRepository
/**
* Create a new QueryBuilder instance that is prepopulated for this entity name
*
* #param string $alias
* #return QueryBuilder $qb
*/
public function createQueryBuilder($alias)
{
return $this->_em->createQueryBuilder()
->select($alias)
->from($this->_entityName, $alias);
}
It first parameter is $alias and the parameter in select() , from() is the same $alias and then it calls the createQueryBuilder() method of Doctrine\ORM\EntityManager, now considering your case
$er->createQueryBuilder('User')
->select('u')
->from('Pro\UserBundle\Entity\User', 'u')
The alias you have selected in createQueryBuilder() is User which is different from the alias you gave in select('u') , from('u') i guess that would be problem ,also when you have defined class in your entity type field you can just directly use it without using again from() method like
$form = $this->createFormBuilder()
->add('banish', 'entity', array(
'label' => $this->trans("Usuarios a expulsar"),
'class' => 'Pro\UserBundle\Entity\User',
'query_builder' => function(EntityRepository $er) use ($page){
return $er->createQueryBuilder('u')
->select('u,m')
->innerjoin('Pro\MembershipBundle\Entity\Membership', 'm', 'WITH', 'u.id = m.user')
->where( 'm.community = :community')
->setParameter('community', $page['community']);
},
))
->getForm();
Also using WITH in join will join the table with multiple conditions like ON(a.col1=b.col1 AND a.col2=b.col2) so if you have any property that points to membership defined in your user entity you can just use
->innerjoin('u.mapped_property')
it will automatically joins your user and membership table like ON(u.id=m.user_id)