php - Symfony 3 form read only field? (with FOSUserbundle) -


using symfony 3 fosuserbundle, how make custom field of user registration read only)

in registrationformtype.php, buildform method tried:

->add('name', 'text', array('read_only' => true))

which gets invalidargumentexception

->add('name', 'text', array('read_only' => true))

which gets undefinedoptionsexception

try : 

->add('name', textareatype::class, array(      'attr' => array(         'readonly' => true,        ),    ));

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