Validating Zend\Form\Element\Collection - zend-framework2

Question

I have a form which has 'rows' added dynamically using Zend\Form\Element\Collection. This works fine, but I am struggling to add the validation for these rows.
So far my code looks something like the following. I presume I need to pass something to InputFilter\InputFilter::add() but I can't figure out what:
<?php
class EditForm extends \Zend\Form\Form
{
public function __construct()
{
parent::__construct('edit');
$this->setUpFormElements();
$this->setupInputFilters();
}
protected function setUpFormElements()
{
$fieldset = new \Zend\Form\Fieldset;
$nameElement = new \Zend\Form\Element\Text('name');
$fieldset->add($nameElement);
$descriptionElement = new \Zend\Form\Element\Text('description');
$fieldset->add($description);
$this->add(
array(
'type' => 'Zend\Form\Element\Collection',
'name' => 'rows',
'options' => array(
'label' => 'Edit Rows',
'should_create_template' => true,
'allow_add' => true,
'target_element' => $fieldset,
)
)
);
return $this;
}
public function setupInputFilters()
{
$filter = new \Zend\InputFilter\InputFilter();
$filter->add(
array(
'name' => 'rows',
'required' => true,
'validators' => array(
// Not sure what to do here!
)
)
);
return $this;
}
}

Answer 1

I think you need to add the input filter to the getInputFilterSpecification method of the fieldset you are adding dynamically
class Row extends Fieldset implements InputFilterProviderInterface
{
$this->add(array(
'name' => 'yourFieldset',
'options' => array(
'label' => 'One of your fieldset elements'
),
'attributes' => array(
'required' => 'required'
)
));
$this->add(array(
'name' => 'fields',
'options' => array(
'label' => 'Another fieldset element'
),
'attributes' => array(
'required' => 'required'
)
));
public function getInputFilterSpecification()
{
return array(
'yourFieldset' => array(
'required' => true,
),
'fields' => array(
'required' => true,
'validators' => array(
array(
'name' => 'Float'
)
)
)
);
}
then in your form you need to set the validation group
class EditForm extends Form
{
public function __construct()
{
$this->add(
array(
'type' => 'Zend\Form\Element\Collection',
'name' => 'rows',
'options' => array(
'label' => 'Edit Rows',
'should_create_template' => true,
'allow_add' => true,
'target_element' => $fieldset,
)
)
);
$this->setValidationGroup(array(
'csrf',
'row' => array(
'yourFieldset',
'fields',
)
));
}
}