field array type in entity for form choice type field symfony

Question

I would like to create a UserForm for create user in my system backend. I use a entity with a 'role' field as type array I want use a select choice field type Form with that entity field. I use a transformer class system for convert data between Entity and form.

but I turn around in my head and nothing run correctly.

When I use options 'multiple' of choice type, my field display correctly but I don't want to display and select multiple value for this field.

I have Notice: Undefined offset: 0 error or I have ContextErrorException: Notice: Array to string conversion

Here few essential code :

UserForm class

    $builder->add($builder->create('roles', 'choice', array(
    'label' => 'I am:',
    'mapped' => true,
    'expanded' => false,
    'multiple' => false,
    'choices' => array(
        'ROLE_NORMAL' => 'Standard',
        'ROLE_VIP' => 'VIP',
    )
))->addModelTransformer($transformer));

transformer Class

class StringToArrayTransformer implements DataTransformerInterface
{
    public function transform($array)
    {
        return $array[0];
    }

    public function reverseTransform($string)
    {
        return array($string);
    }
}

controller method

$user = new User(); //init entity
$form = $this->createForm(new UserForm(), $user);

$form->handleRequest($request);

if ($form->isValid())
{
    $em = $this->getDoctrine()->getManager();
    $em->persist($form);
    $em->flush();
    return $this->redirect($this->generateUrl('task_success'));
}

entity part

/**
 * @ORM\Column(name="roles", type="array")
 */
protected $roles;

public function getRoles()
{
    return $this->roles;
}
public function setRoles(array $roles)
{
    $this->roles = $roles;
    return $this;
}

My field roles entity must be a array for run correctly the security component Symfony

can you help me to understand why this field form refuse to display ?

I already readed others questions in same issue but there is anything that I don't understand because nothing help me to resolve my problem.

If you can help me with MY particular context...

Thank for support

If you do not want to be able to select multiple choices, why is your role property of type array? — stollr
– stollr, Commented Mar 11, 2014 at 19:59

stollr · Accepted Answer · 2014-03-11 20:24:22Z

3

because security symfony component integration

If you only need the "getRoles" method because of the interface you are implementing, it is simpler (and cleaner) to do the following:

Change the entities field again to role with type string
Rename your getter and setter to getRole() and setRole()

and add a getRoles method like this:

public function getRoles()
{
    return array($this->role);
}

In your form type, change the field name to "role" and 'multiple' => false
Remove your model transformer

This should be the solution ;)

answered Mar 11, 2014 at 20:24

stollr

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5 Comments

miltone Over a year ago

I don't understand why did you create a getRoles function. getRole run correctly after modified my field ?

stollr Over a year ago

If you are using your own User class for Symfony's security system (see its documentation) you have to implement the UserInterface, which requires the getRoles function to return an array with all roles ;)

miltone Over a year ago

It's strange that user can run correclty without implement a part of UserInterface but exactly my new getRole() function is not a implementation of UserInterface.

stollr Over a year ago

hmm... but, as far as I know, you won't be able to log in, without implementing the UserInterface.

miltone Over a year ago

4/4 implementing methods ok, 3/4 implementing methods ok but for 2/4 or 1/4 that is the most important question I think.

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