Doctrine 2: Find by entity with composite primary key - php

Question

I have two entity classes, Product and OrderEntry, defined like this (some annotations left out for compactness):
class Product {
/**
* #Id
*/
protected $id;
/**
* #Column()
* #Id
*/
protected $prodNumber;
/**
* #Column()
* #Id
*/
protected $group;
// more cols here
}
class OrderEntry {
// more cols here
/**
* #ManyToOne(targetEntity="Product")
* #JoinColumns({
* #JoinColumn(name="prodNumber", referencedColumnName="prodNumber"),
* #JoinColumn(name="group", referencedColumnName="group")
* })
*/
protected $Product;
}
Now I want to find an OrderEntry by its associated Product with the query builder. The most logical thing for me would be this:
class OrderEntryRepository extends EntityRepository {
public function findByProduct($product) {
$qb = $this->getQueryBuilder('o');
$qb->where($qb->expr()->eq('o.Product', '?1')
->setParameter(1, $product)
->setMaxResults(1);
return $qb->getQuery()->execute();
}
}
However, this throws an exception that says
A single-valued association path expression to an entity with a
composite primary key is not supported. Explicitly name the components
of the composite primary key in the query.
How do I name the components explicitly? I know I could do it with a JOIN, but I have no use for the Product in this case and it would just make the query more expensive.

Answer 1

You can't avoid joining the products table with the current mapping:
public function findByProduct($product) {
$qb = $this->getQueryBuilder('o');
$qb
->join('o.Product', 'p')
->where('p.prodNumber = ?1')
->setParameter(1, $product->getProdNumber())
->andWhere('p.group = ?2')
->setParameter(2, $product->getGroup())
;
return $qb->getQuery()->getOneOrNullResult();
}
You can add separate properties to OrderEntry, which would use the same columns as the JoinColumns, e.g.:
/**
* #Column(name="prodNumber")
*/
protected $prodNumber;
And then you can use them in conditions:
...
->where('o.prodNumber = ?1')
->setParameter(1, $product->getProdNumber()
...