Symfony3: Why choices submit key text instead of its value

Question

Symfony version 3.1.3

I am generating a choices list from the database like bellow and it works fine.

class ClassType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('class',
                      EntityType::class,
                      array('class'         => 'PIE10Bundle:Classes',
                            'expanded'      => false,
                            'multiple'      => false,));
        // some other form elements
    }    
}

in the web page it gives HTML Select like below,

<select name="class[class]" id="class_class">
    <option value="6">1A</option>
    <option value="7">4C</option>
</select>

and in the controller, I am getting the submitted data and debug it as below,

if( $form->isSubmitted() && $form->isValid() )
{
    $cName  = $form['class']->getData();
    echo $cName;
    die;
}

My result is 1A or 4C (depending on the selection) but not 6 or 7 . I am expecting to get the values of the choice list but not its key text.

I wonder how this happens and how to fix this to get the value. Further I have another choice list in the same form but it submits the expected value.

Thanks

Answer 1

try with

$cName->getId() 

I suppose the $cName is an istance of the PIE10Bundle:Classes entity (try dumping a get_class($cName) ) and the echo print the name because is implemented as a __toString method.

Hope this help