Multiple forms of same type - Symfony 2

问题:

So I have my controller action similar to this

$task1 = new Task();
$form1 = $this->createForm(new MyForm(), $task1);

$task2 = new Task();
$form2 = $this->createForm(new MyForm(), $task2);

And let's say my MyForm has two fields

//...
$builder->add('name', 'text');
$builder->add('note', 'text');
//...

It seems like since the two forms are of the same type MyForm, when rendered in the views, their fields have the same name and IDs (the 'name' fields of two forms share the same name and id; the same goes for the 'note' fields), because of which Symfony may not bind the forms' data correctly. Does anyone know any solution to this?

回答1:

// your form type
class myType extends AbstractType
{
   private $name = 'default_name';
   ...
   //builder and so on
   ...
   public function getName(){
       return $this->name;
   }

   public function setName($name){
       $this->name = $name;
   }

   // or alternativ you can set it via constructor (warning this is only a guess)

  public function __constructor($formname)
  {
      $this->name = $formname;
      parent::__construct();
  }

}

// you controller

$entity  = new Entity();
$request = $this->getRequest();

$formType = new myType(); 
$formType->setName('foobar');
// or new myType('foobar'); if you set it in the constructor

$form    = $this->createForm($formtype, $entity);

now you should be able to set a different id for each instance of the form you crate.. this should result in <input type="text" id="foobar_field_0" name="foobar[field]" required="required> and so on.

回答2:

I would use a static to create the name

// your form type

    class myType extends AbstractType
    {
        private static $count = 0;
        private $suffix;
        public function __construct() {
            $this->suffix = self::$count++;
        }
        ...
        public function getName() {
            return 'your_form_'.$this->suffix;
        }
    }

Then you can create as many as you want without having to set the name everytime.

回答3:

EDIT: Do not do that! See this instead: http://stackoverflow.com/a/36557060/6268862

In Symfony 3.0:

class MyCustomFormType extends AbstractType
{
    private $formCount;

    public function __construct()
    {
        $this->formCount = 0;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        ++$this->formCount;
        // Build your form...
    }

    public function getBlockPrefix()
    {
        return parent::getBlockPrefix().'_'.$this->formCount;
    }
}

Now the first instance of the form on the page will have "my_custom_form_0" as its name (same for fields' names and IDs), the second one "my_custom_form_1", ...

回答4:

create a single dynamic name :

const NAME = "your_name";

public function getName()
{
    return self::NAME . '_' . uniqid();
}

your name is always single