display the name but insert the id whit entity field type

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PHP

Symfony 2.3

$builder->add('users', 'entity', array(
    'class' => 'AcmeHelloBundle:User',
    'property' => 'name',
));

Use this method to display a select users in a update form. The problem is that when the data are sent , send the name and want to send the id while showing the names in the select.

not use relationships in the database or the entities