如何在symfony自动生成的表单（链接到关系）中的选择窗口小部件中设置一组结果

I would like to know with the following code, how to display in the generated form, a set of Contacts, linked to the Company of this note, instead of all contacts in the DB?

Entity Note :

 /**
     * @ORM\ManyToOne(targetEntity="Main\MainBundle\Entity\NoteType")
     * @ORM\JoinColumn(nullable=false)
     */
    private $noteType;

    /**
     * @ORM\ManyToOne(targetEntity="Main\MainBundle\Entity\Contact", inversedBy="contacts")
     * @ORM\JoinColumn(nullable=true)
     */
    private $contact;

    /**
     * @ORM\ManyToOne(targetEntity="Main\MainBundle\Entity\Company")
     * @ORM\JoinColumn(nullable=false)
     */
    private $company;

    /**
     * @ORM\ManyToOne(targetEntity="Main\MainBundle\Entity\User", inversedBy="users")
     * @ORM\JoinColumn(nullable=false)
     */
    private $user;

Entity Company :

/**
 * @ORM\OneToMany(targetEntity="Main\MainBundle\Entity\Contact", mappedBy="company", cascade={"remove"})
 * @ORM\JoinColumn(nullable=true)
 */
private $contacts;

If you don't like to use QueryBuilder you can set your contacts in the controller:

$oForm = $this->createForm(new CompanyForm($contacts));

and in the form you can do this:

public function __construct($contacts))
{
    $this->vContacts = $contacts;
}

then:

->add('contacts', 'choice', array(
            'required' => true,
            'label' => 'contacts',
            'choices' => $this->vContacts,
           )
        )

If you need to get particular set of entities in your form field, you can use query builder.

In your case (inside your form type class) it could be something like:

$builder->add('contacts', 'entity', array(
    'class' => 'MainMainBundle:Contact',
    'query_builder' => function (EntityRepository $er) use ($company) {
        return $er->createQueryBuilder('c')
            ->where('c.company = :company')
            ->setParameter('company', $company);
    },
));

Pay attention to pass $company variable.