Symfony2：如何从Controller中的表单获取默认值？

Question

I want to get a default value from a form. For example, I rendered a select box form by using the following code:

$form = $this->createFormBuilder()
            ->add('patient', 'choice', array(
                'choices' => $patientArray,
                'required' => true,
                'label' => false
            ))
            ->getForm();

The patientArray values are composed of patient_id and patient_name :

array(
    '2' => 'John'
    '3' => 'Jane'
);

So, I would like to get the default value which is 2 => John without submit a button and without choosing the select form. What is a proper way to achieve this in a controller?

Answer 1

You need to set default value in your entity . You can use __construct() method for it.

    // create a task and give it some dummy data for this example
    $task = new Task();
    $task->setTask('Write a blog post');
    $task->setDueDate(new \DateTime('tomorrow'));

    $form = $this->createFormBuilder($task)
        ->add('task', 'text')
        ->add('dueDate', 'date')
        ->add('save', 'submit')
        ->getForm();

    return $this->render('AcmeTaskBundle:Default:new.html.twig', array(
        'form' => $form->createView(),
    ));

In this example task field has Write a blog post value by default. You also can do this in __construct() , and you don't need use setter, but it is't necessary.

But better use __construct instead setter like:

// src/Acme/TaskBundle/Entity/Task.php
namespace Acme\TaskBundle\Entity;

class Task
{
    protected $task;

    protected $dueDate;

    public function __construct() {
        $this->task = 'Write a blog post';
    }

and you always have default value when create Task object

Ps You can find more examples in forms documentation