Doctrine Entity findBy Many to Many

Question

I have a many to many relationship between products and colours.

What I am trying to do is find products by their colours.

eg)

$colours = $em->getRepository('Xxxxx\XxxxxBundle\Entity\Colour')->findBy(array('name'=>'red');
$products = $em->getRepository('Xxxxx\XxxxxBundle\Entity\Product')->findBy(array('colours'=>$colours));

This is my Yaml config:

Xxxxx\XxxxxBundle\Entity\Product:
  type: entity
  manyToMany:
    colours:
      targetEntity: Colour
      joinTable:
        name: Product_Colour
        joinColumns:
          product_id:
            referencedColumnName: id
        inverseJoinColumns:
          colour_id:
            referencedColumnName: id

.

 Xxxxx\XxxxxBundle\Entity\Colour:
  type: entity
  id:
    id:
      type: integer
      generator:
        strategy: AUTO
  fields:
    hex:
      type: string
      length: 320
    name:
      type: string
      length: 320

The error message I am getting is:

Notice: Undefined index: joinColumns in /home/xxx/public_html/products/vendor/doctrine/lib/Doctrine/ORM/Persisters/BasicEntityPersister.php line 1217

Would someone be able to shine some light on why this is not working.

Answer 1

I know this is an old question, but if anyone else arrives here via Google (like I did), I had to eschew the findBy and use DQL in the repository:

$products = $em->getRepository('Vendor\Bundle\Entity\Product')->findByColours($colours);

And in the repository:

public function findByColours($colours)
{
    $qb = $this->getEntityManager()->createQueryBuilder();
    $qb ->select(array('p'))
        ->from('VendorBundle:Product', 'p')
        ->join('p.colours', 'c', 'WITH', $qb->expr()->in('c.id', $colours));
    $result = $qb->getQuery()->execute();
    return $result;

}

You may need to change the join based on what $colours is. This is assuming it's an array of colour IDs. If it's a string you can forgo the in() or if it's an array of strings you'll need to bind the strings as parameters (see the following link). Clarification on expr() and such is in the Doctrine docs

I don't know why Undefined index: joinColumns occurs, but this is a method to side-step it altogether. Hopefully someone can clarify as to the error, as my solution adds extra work to the Many to Many relationship.