How to validate if 'email' exists Zend Framework 2 - zend-framework2

Question

I want to use NoRocordExists to validate if email exists before insert the information inside the mysql DB but i don't get how can i call $dbapater.
This is my code of my inputfilter class
$norecord_exists = new NoRecordExists(
array(
'table' => 'users',
'field' => 'email',
'adapter' => $dbadapter
)
);
$norecord_exists->setMessage('Email already exists !', 'recordFound');
$this->add(array(
'name' => 'email',
'required' => true,
'filters' => array(
array('name' => 'StringTrim'),
),
'validators' => array(
$norecord_exists,
array(
'name'=>'EmailAddress',
'options'=> array(
'allowWhiteSpace'=>true,
'messages' => array(
\Zend\Validator\EmailAddress::INVALID_HOSTNAME=>'Email incorrecto',
),
),
),
)
));

Answer 1

With ZF2, I advise you to use FactoryInterface like this :
UserFormFactory.php
<?php
namespace User\Form\Service;
use User\Form\UserForm;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;
class UserFormFactory implements FactoryInterface
{
/**
* #param ServiceLocatorInterface $serviceLocator
* #return UserForm
*/
public function createService(ServiceLocatorInterface $serviceLocator)
{
/* #var ServiceLocatorInterface $sl */
$sl = $serviceLocator->getServiceLocator();
$form = new UserForm();
$form->setDbAdapter($sl->get('Zend\Db\Adapter\Adapter'));
return $form;
}
}
UserForm.php
<?php
namespace User\Form;
use Zend\Db\Adapter\AdapterInterface;
use Zend\Form\Form;
use Zend\InputFilter\InputFilterProviderInterface;
class UserForm extends Form implements InputFilterProviderInterface
{
/**
* #var AdapterInterface
*/
protected $dbAdapter;
/**
* Initialisation
*/
public function init()
{
$this->add([
'name' => 'email',
'type' => 'Email',
'options' => [
'label' => 'Email',
],
'attributes' => [
'class' => 'form-control',
'required' => 'required',
],
]);
// ...
$this->add([
'name' => 'submit',
'type' => 'Submit',
'attributes' => [
'value' => 'Connexion',
'class' => 'btn btn-default',
],
]);
}
/**
* InputFilter
*
* #return array
*/
public function getInputFilterSpecification()
{
return [
'email' => [
'required' => true,
'filters' => [
['name' => 'StripTags'],
['name' => 'StringTrim'],
['name' => 'StringToLower'],
],
'validators' => [
[
'name' => 'EmailAddress',
], [
'name' => 'Db\NoRecordExists',
'options' => [
'table' => 'user',
'field' => 'email',
'adapter' => $this->getDbAdapter(),
],
],
],
],
// ...
];
}
/**
* #return AdapterInterface
*/
public function getDbAdapter()
{
return $this->dbAdapter;
}
/**
* #param AdapterInterface $dbAdapter
* #return UserForm
*/
public function setDbAdapter(AdapterInterface $dbAdapter)
{
$this->dbAdapter = $dbAdapter;
return $this;
}
}
module.config.php
return [
'form_elements' => [
'factories' => [
'UserForm' => 'User\Form\Service\UserFormFactory',
],
],
];
Finally, in your controller
$form = $this->getServiceLocator('FormElementManager')->get('UserForm');
//..
if ($form->isValid()) // ...

Answer 2

You need to move this code
$norecord_exists = new NoRecordExists(
array(
'table' => 'users',
'field' => 'email',
'adapter' => $dbadapter
)
);
$norecord_exists->isValid(EMAIL_FROM_THE_FORM_FIELD) {
return false; //email exists
}
return true; // email doen't exists
in your Controller or in a separate service/factory. $dbadapter usually holds the instance to your Zend\Db\Adaptr\Adapter or any other configuration you have.