如何获取额外数据以提供symfony2集合字段类型？

Question

I am using a basic collection field with Symfony2, and everything is working well.

Say I have:

->add('product', 'collection', array(...))

Now, in my view, I am calling product.vars.data.owner where I have a oneToOne product->getOwner() .

This is generating one extra request per product in the collection. Since I can't use a querybuilder in a collection field, how can I make sure it doctrine fetches the product owners in order to avoid those many extra requests?

Answer 1

This is an example(I don't see your data mapping & form builder), I hope this help you :

1 : Fetch your data by dql ,

$dql = "select c from category c left join c.product p join p.owner o where c.id = ?1";
$category = $this->createQuery($dql)->setParameter(1, $id)->getSingleResult();

2 : Suppose you have a category form that could have many products:

class Category
{
    // manyToMany
    private $product
}

$form = $this->createForm(new CategoryType(), $category);

3 : If your collection type be an embedded ProductType(form type) then you can use below line in your template:

{{ form.product.vars.data.owner }} 

Answer 2

If you can't use a querybuilder you could force Doctrine to always load the owner on the product whenever the product is loaded by EAGER loading the association:

/**
 * @ORM\OneToOne(targetEntity="Application\Entity\Owner", fetch="EAGER")
 */
protected $owner;

http://doctrine-orm.readthedocs.org/en/latest/reference/working-with-objects.html#by-eager-loading