QueryBuilder Invalid PathExpression. Must be a StateFieldPathExpression - php

Question

Trying to fetch all supplierUsers where the id is DISTINCT and hydrate the results.
The SQL query to get all the results would be the following
SELECT DISTINCT supplier_user_id FROM job_item_quote
The Query builder to fetch the above.
$qb = $this->createQueryBuilder('a')
->select('a.supplierUser')
->distinct(true);
$result = $qb->getQuery()->getResult();
Outputted getQuery(). Which is exactly what I'm looking for.
SELECT DISTINCT a.supplierUser FROM Project\Entities\JobItemQuote a
The error thrown when trying to fetch distinct users
[Semantical Error] line 0, col 18 near 'supplierUser,': Error: Invalid PathExpression. Must be a StateFieldPathExpression.
I've tried adding joins in for supplierUser in hopes it would fix. Same error thrown.
JobItemQuote Entity
/**
* #ORM\Entity(repositoryClass="Project\Repositories\JobItemQuote\JobItemQuoteRepository")
* #ORM\Table(name="job_item_quote")
*/
class JobItemQuote extends BaseEntity
{
public static $joins = [
'supplierUser' => SupplierUser::class,
'jobItem' => JobItem::class
];
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
* #var int
*/
protected $id; // thekey
/**
* #ORM\ManyToOne(targetEntity="JobItem", inversedBy="quotes")
* #var JobItem
*/
protected $jobItem;
/**
* #ORM\ManyToOne(targetEntity="SupplierUser")
* #var SupplierUser
*/
protected $supplierUser;
....
}
SupplierUser Entity
/**
* #ORM\Entity(repositoryClass="Project\Repositories\SupplierUser\SupplierUserRepository")
* #ORM\Table(name="supplier_user")
*/
class SupplierUser extends User {
public static $joins = [
'supplier' => Supplier::class,
'supplierGroup' => SupplierGroup::class
];
/**
* #ORM\OneToOne(targetEntity="Supplier", inversedBy="supplierUser", cascade={"persist"})
* #var Supplier
*/
protected $supplier;
/**
* #ORM\ManyToOne(targetEntity="SupplierGroup")
* #var Group
*/
protected $supplierGroup;
....
}

Answer 1

Your need is to retrieve the list of supplierUsers associated with JobItemQuote, so you should make the query in JobItemQuoteRepository making a join with supplierUsers, you find bellow the example :
$qb = $this->createQueryBuilder('jiq')
->select('su')
->join(SupplierUser::class, 'su', Join::With, 'su.id = jiq.supplierUser')
->distinct(true)
;
$result = $qb->getQuery()->getResult();
By this query you will have the list of SupplierUser (distinctly) assoiated to JobsItemQuote.