Symfony2 form entity preferred_choices set selected values - php

Question

I'm having dificulties trying to set on my form the selected values on the preferred choices.
I have a class calendar that can have multiple taxes:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name')
->add('possibledigits')
->add('notes')
->add('autogenerateyear', 'checkbox', array('required' => false))
->add('calendartaxes', null, array(
'required' => false,
'multiple' => true,
'expanded' => true
))
;
}
The relation is many to many:
/**
* #ORM\ManyToMany(targetEntity="CalendarTax", indexBy="name", inversedBy="calendarios")
* #ORM\JoinTable(name="contable_schedule_taxes_relation")
*/
private $calendartaxes;
What I was going to do is to try to get the entity of the form and try to get the selected taxes. But I don't know if that is the correct way to do it.
Is there a more elegant way to do it?
I'm using symfony 2.3.
Regards.

Answer 1

I am assuming you have a relationship set up betwween Calendarios and CalendarTax
so before you create the form ... do
$calendarios = new CalendarIOS();
$calendartax = $this->getDoctrine()->getManager()->getRepository('NamBundle:CalendarTax')->find($calendar_tax_id);
$calendarios->addCalendarTax($calendartax);
now when you send the entity over to the formbuilder...you will have that perticular calendartax checked... :)

Answer 2

Finally I use the preferred_choices of the choice.
public function buildForm(FormBuilderInterface $builder, array $options)
{
$calendario = $builder->getData();
$taxesId = array();
foreach($calendario->getCalendartaxes() as $tax){
$taxesId[] = $tax;
}
$builder
->add('name')
->add('possibledigits')
->add('notes')
->add('autogenerateyear', 'checkbox', array('required' => false))
->add('calendartaxes', null, array(
'required' => false,
'multiple' => true,
'expanded' => true,
'preferred_choices' => $taxesId,
))
;
}
Making one more query and getting the calendar of the form builder.
The comment given by #Hakim was the one that put me on the right path.
Thanks!