What is the correct way to add validation on the form level in ZF2? - validation

Question

There is a complex form with a lot of nested fieldsets. Some fields need to be validated depending on field(-s) in another fieldset. So I cannot define all the validation rules directly in the getInputFilterSpecification() of the Fieldset, since there I cannot access other fieldsets (only the sub-fieldsets). The only way to do this is to extend the Form validation. Right? If so, how to do this?
MyForm extends Form
{
public function isValid()
{
$isFormValid = parent::isValid();
$isFieldXyzValid = // my additional validation logic
if(! $isFieldXyzValid) {
$fieldXyz->setMessages(...);
}
return $isFormValid && $isFieldXyzValid;
}
}
Like this? Or is a cleaner way to solve this problem?

Answer 1

I've already developed something similar in my previous project.
For doing this i used a service which take my form and set dynamic fieldset, and obviously custom validation rules.
In your controller, get your form (via the dependancy injection formManager (polyfilled or not).
$form = $this->formManager->get('{your form}');
Call your service and give it your form.
And in your service you can do anything you want like :
get your stuff (from DB or others) to determine wich fields are mandatory
Foreach on your form
Add or remove fieldset
Add or remove validationGroup fields
Add or remove filters
Add or remove validators
I performed those via (sample) in a foreach where $stuff is an element of doctrine collection
$nameFieldset = 'my_fieldset-'.$stuff->getId();
$globalValidator = new GlobalValidator();
$globalValidator->setGlobalValue($gloablValue);
$uoValidator = new UcValidator();
$uoValidator->setOptions(array(
'idToValidate' => $stuff->getId(),
'translator' => $this->translator
));
$globalValidator->setOptions(array(
'idToValidate' => $stuff->getId(),
'translator' => $this->translator
));
$name = 'qty-'.$stuff->getId();
$form = $this->setFilters($form, $name, $nameFieldset);
$globalValidator->setData($data);
$form = $this->setValidators($form, $name, $globalValidator, $uoValidator, $nameFieldset);
Where setFilters and setValidators are custom methods wich add filters and validator to my fields (also custom)
/**
* #param myForm $form
* #param $name
* #param string $nameFieldset
* #return myForm
*/
public function setFilters($form, $name, $nameFieldset)
{
$form->getInputFilter()->get('items')->get($nameFieldset)
->get($name)
->getFilterChain()
->getFilters()
->insert(new StripTags())
->insert(new StringTrim());
return $form;
}
/**
* #param myForm $form
* #param $name
* #param $globalValidator
* #param $uoValidator
* #param $nameFieldset
* #return myForm
*/
public function setValidators($form, $name, $globalValidator, $uoValidator, $nameFieldset)
{
$optionsSpace = [
'translator' => $this->translator,
'type' => NotEmpty::SPACE
];
$optionsString = [
'translator' => $this->translator,
'type' => NotEmpty::STRING
];
$optionsDigits = [
'translator' => $this->translator,
];
$form->getInputFilter()->get('items')
->get($nameFieldset)
->get($name)
->setRequired(true)
->getValidatorChain()
->attach($uoValidator, true, 1)
->attach($globalValidator, true, 1)
// We authorize zéro but not space nor strings
->attach(new NotEmpty($optionsSpace), true, 2)
->attach(new NotEmpty($optionsString), true, 2)
->attach(new Digits($optionsDigits), true, 2);
return $form;
}