How to get data from different model for select?

Question

I have form with some attributes:

class ToraForm extends Form
{
    public function __construct($name = null)
    {
        parent::__construct('tora');
        $this->setAttribute('method', 'post');

        $this->add(array(
            'name' => 'id',
            'attributes' => array(
                'type' => 'hidden',
            ),
        ));
        $this->add(array(
            'name' => 'name',
            'attributes' => array(
                'type' => 'text',
                'required' => true,
            ),
            'options' => array(
                'label' => 'name',
            ),
        ));
}

but I want add drop-down list with data taken from another model. How to do it?

Answer 1

There are several different approaches you can take. Ultimately your Form has a dependency, which needs to be injected. I have written an in-depth blog-post about the three most common use-cases for Form-Dependencies for a Select-List.

• Zend\Form\Element\Select and Database-Values

My BlogPost covers the following scenarios:

• Zend\Form\Element\Select via DbAdapter
• Zend\Form\Element\Select via TableGateway
• DoctrineModule\Form\Element\DoctrineObject via Doctrine2

Here i will demonstrate only the DbAdapter approach without much explanation. Please refer to my blogpost for the in-depth explanations.

public function formDbAdapterAction()
{
    $vm = new ViewModel();
    $vm->setTemplate('form-dependencies/form/form-db-adapter.phtml');

    $dbAdapter = $this->getServiceLocator()->get('Zend\Db\Adapter\Adapter');
    $form      = new DbAdapterForm($dbAdapter);

        return $vm->setVariables(array(
        'form' => $form
    ));
}

Then the respective Form Class:

class DbAdapterForm extends Form
{
    protected $dbAdapter;

    public function __construct(AdapterInterface $dbAdapter)
    {
        $this->setDbAdapter($dbAdapter);

        parent::__construct('db-adapter-form');

        $this->add(array(
            'name'    => 'db-select',
            'type'    => 'Zend\Form\Element\Select',
            'options' => array(
                'label'         => 'Dynamic DbAdapter Select',
                'value_options' => $this->getOptionsForSelect(),
                'empty_option'  => '--- please choose ---'
            )
        ));
    }

    // more later...

    // Also: create SETTER and GETTER for $dbAdapter!
}

And last but not least the DataProvider function:

public function getOptionsForSelect()
{
    $dbAdapter = $this->getDbAdapter();
    $sql       = 'SELECT t0.id, t0.title FROM selectoptions t0 ORDER BY t0.title ASC';
    $statement = $dbAdapter->query($sql);
    $result    = $statement->execute();

    $selectData = array();

    foreach ($result as $res) {
        $selectData[$res['id']] = $res['title'];
    }

    return $selectData;
}