Access result of other field validation in a Zend Framework 2 validator - zend-framework2

Question

I have a form with two dates, start and stop. I have a validator for start and I want to validate stop and also that stop is after start. But the after validation only makes sense if start is valid.
isValid($value, $context = null) could be passed the other values in the context variable, but then I have to do the start check again.
So is there a possibility to check the result of the start validation in the stop validator's isValid() function?

Answer 1

You can use Callback
Or just write your own validator
------ Edit - my proposed answer - Input filter with callback or validator ------
I do that like this.
First create a filter with all params:
namespace MyGreatNameSpace\Filter;
use Zend\InputFilter\InputFilter;
use Zend\InputFilter\Factory as InputFactory;
class MyDateFilter extends InputFilter
{
public function __construct($myGreatClass)
{
$factory = new InputFactory();
$this->add($factory->createInput(array(
'name' => 'start_date',
'required' => true,
'validators' => array(
array(
'name' => 'Date',
'options' => array(
'format' => '2000-10-10',
),
)
),
)));
$this->add($factory->createInput(array(
'name' => 'end_date',
'required' => true,
'validators' => array(
array(
'name' => 'Date',
'options' => array(
'format' => '2000-10-10',
),
),
array(
'name' => 'Callback',
'options' => array(
'callback' => array($myGreatClass, 'isDateNewer'),
'messages' => array(
'callbackValue' => "The end date is Older then the start date",
),
),
),
),
)));
} // End of __construct
}
Create the callback function
public function isDateNewer($date, $params)
{
$date2 = $params['start_date'];
if ($date > $date2) { // Over simplistic
return TRUE;
}
}
Implant in the controller (I used services to pull the form/filter class)
// Get the form / validator objects from the SM
$form = $this->getServiceLocator()->get('date_form');
$filter = $this->getServiceLocator()->get('date_filter');
// Inject the input filter object to the form object, load the form with data and bind the result to the model
$form->setInputFilter($filter);
$form->setData($post);
$form->bind($myModel); // (if you wish to bind the data to whatever)
if (!$form->isValid()) {
return $this->forward()->dispatch.... (or whatever)
}
Another slightly diffrent way (though cleaner) is to write a validator. Check the Zend\Validator\Identical (note the token)
array(
'name' => '\Application\Validator\myNewNamedValidator',
'options' => array(
'token' => 'start_date',
'messages' => array(
'older' => "The end date is Older then the start date",
),
),
),