Symfony2 : How to get form validation errors after binding the request to the form

Here's my saveAction code (where the form passes the data to)

public function saveAction()
{
    $user = OBUser();

    $form = $this->createForm(new OBUserType(), $user);

    if ($this->request->getMethod() == 'POST')
    {
        $form->bindRequest($this->request);
        if ($form->isValid())
            return $this->redirect($this->generateUrl('success_page'));
        else
            return $this->redirect($this->generateUrl('registration_form'));
    } else
        return new Response();
}

My question is: how do I get the errors if $form->isValid() returns false?

Solution 1:

You have two possible ways of doing it:

• do not redirect user upon error and display {{ form_errors(form) }} within template file
• access error array as $form->getErrors()

Solution 2:

Symfony 2.3 / 2.4:

This function get's all the errors. The ones on the form like "The CSRF token is invalid. Please try to resubmit the form." as well as additional errors on the form children which have no error bubbling.

private function getErrorMessages(\Symfony\Component\Form\Form $form) {
    $errors = array();

    foreach ($form->getErrors() as $key => $error) {
        if ($form->isRoot()) {
            $errors['#'][] = $error->getMessage();
        } else {
            $errors[] = $error->getMessage();
        }
    }

    foreach ($form->all() as $child) {
        if (!$child->isValid()) {
            $errors[$child->getName()] = $this->getErrorMessages($child);
        }
    }

    return $errors;
}

To get all errors as a string:

$string = var_export($this->getErrorMessages($form), true);

Symfony 2.5 / 3.0:

$string = (string) $form->getErrors(true, false);

Docs:
https://github.com/symfony/symfony/blob/master/UPGRADE-2.5.md#form https://github.com/symfony/symfony/blob/master/UPGRADE-3.0.md#form (at the bottom: The method Form::getErrorsAsString() was removed)

Solution 3:

Below is the solution that worked for me. This function is in a controller and will return a structured array of all the error messages and the field that caused them.

Symfony 2.0:

private function getErrorMessages(\Symfony\Component\Form\Form $form) {
    $errors = array();
    foreach ($form->getErrors() as $key => $error) {
        $template = $error->getMessageTemplate();
        $parameters = $error->getMessageParameters();

        foreach($parameters as $var => $value){
            $template = str_replace($var, $value, $template);
        }

        $errors[$key] = $template;
    }
    if ($form->hasChildren()) {
        foreach ($form->getChildren() as $child) {
            if (!$child->isValid()) {
                $errors[$child->getName()] = $this->getErrorMessages($child);
            }
        }
    }

    return $errors;
}

Symfony 2.1 and newer:

private function getErrorMessages(\Symfony\Component\Form\Form $form) {      
    $errors = array();

    if ($form->hasChildren()) {
        foreach ($form->getChildren() as $child) {
            if (!$child->isValid()) {
                $errors[$child->getName()] = $this->getErrorMessages($child);
            }
        }
    } else {
        foreach ($form->getErrors() as $key => $error) {
            $errors[] = $error->getMessage();
        }   
    }

    return $errors;
}

Solution 4:

Use the Validator to get the errors for a specific entity

if( $form->isValid() )
{
    // ...
}
else
{
    // get a ConstraintViolationList
    $errors = $this->get('validator')->validate( $user );

    $result = '';

    // iterate on it
    foreach( $errors as $error )
    {
        // Do stuff with:
        //   $error->getPropertyPath() : the field that caused the error
        //   $error->getMessage() : the error message
    }
}

API reference:

• ConstraintViolationList
• ConstraintViolation