CODEWITHSUNDEEP
symfonydoctrine-ormdql
Mike
Mike

Reputation: 12839

Symfony2 and Doctrine - Error: Invalid PathExpression. Must be a StateFieldPathExpression

I have an entity that looks like this:

/**
 * @Gedmo\Tree(type="nested")
 * @ORM\Table(name="categories")
 * @ORM\Entity()
 */
class Category extends BaseCategory
{

    /**
    * @ORM\OneToMany(targetEntity="Category", mappedBy="parent")
    */
    protected $children;

    /**
    * @Gedmo\TreeParent
    * @ORM\ManyToOne(targetEntity="Category", inversedBy="children")
    * @ORM\JoinColumn(name="parent_id", referencedColumnName="id", onDelete="SET NULL")
    */
    protected $parent;

}

and I am trying to run a query like this:

$qb = $this->em->createQueryBuilder()
            ->select('c.parent')
            ->from('Category', 'c');

$result = $qb->getQuery()->getArrayResult();

However, I am getting the following error:

[Semantical Error] ... Error: Invalid PathExpression. Must be a StateFieldPathExpression.

How can I select the parent_id field from my table. I have tried a bunch of variations and even if I do something like this:

$qb = $this->em->createQueryBuilder()
            ->select('c')
            ->from('Category', 'c');

I get all fields in the table except for the parent_id. This seems like Doctrine is getting in the way. How can I query for this parent_id field? or better yet how can I get all fields in the table including the parent_id

Upvotes: 113

Views: 132071

Answers (4)

Mohammed Abdelouahab
Mohammed Abdelouahab

Reputation: 89

You can change it like this:

 ->select(array('i.id','identity(i.parent) parent','i.nom'))

Upvotes: 3

Mirza Selimovic
Mirza Selimovic

Reputation: 111

You are selecting an object that is not joined. Like said in another answer, you have to do something like :

qb->innerJoin("c.parent", "p")

Upvotes: 10

user3497021
user3497021

Reputation: 179

Solution using createQueryBuilder:

$query->SELECT('pa.id')
        ->from('Category', 'ca');
$query->join('ca.parent', 'pa');

$result = $query->getQuery()->getArrayResult();

Upvotes: 17

Jani Hartikainen
Jani Hartikainen

Reputation: 43253

You can use the currently undocumented IDENTITY function to select the FK IDs in a query:

SELECT IDENTITY(c.parent) ...

Upvotes: 296

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