Client has a simple and consistent hierarchical taxonomy.
Cities at the top level and Schools at the second level.
.
├── City1
│ ├── School1
│ ├── School2
│ └── School5
└── City2
├── School3
└── School4
The User account entity bundle contains an Entity Reference field to the School taxonomy terms.
I am trying to enforce a constraint to prevent creating or saving a user account if the term selected is at the top level of the hierarchy (and hence a City, not a School).
Here's some example code, skipping the dependency injection of $this->entityTypeManager for brevity.
TermParentConstraint.php:
<?php
namespace Drupal\entity_validation_examples\Plugin\Validation\Constraint;
use Symfony\Component\Validator\Constraint;
/**
* Prevent account creation if School taxonomy term has no parent.
*
* @Constraint(
* id = "TermParent",
* label = @Translation("Prevent account creation if term has no parent", context = "Validation"),
* type = "entity"
* )
*/
class TermParentConstraint extends Constraint {
/**
* Message shown when trying to create account if School has no parent City.
*
* @var string
* School message.
*/
public $schoolMessage = 'You must select both a City and a School.';
}
TermParentConstraintValidator.php:
<?php
namespace Drupal\entity_validation_examples\Plugin\Validation\Constraint;
use Drupal\user\Entity\User;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
/**
* Validates the TermParent constraint.
*/
class TermParentConstraintValidator extends ConstraintValidator {
/**
* {@inheritdoc}
*/
public function validate($entity, Constraint $constraint) {
if (!isset($entity)) {
return;
}
if ($entity->getEntityTypeId() == 'user') {
$school = $entity->get('field_select_a_school')->getValue();
// Orphaned school taxonomy terms must be Cities, not Schools.
$parent = \Drupal::entityTypeManager()
->getStorage('taxonomy_term')
->loadParents($school[0]['target_id']);
if (empty($parent)) {
$this->context->addViolation($constraint->schoolMessage);
}
}
}
}
Expected behavior: When I create a new user account and select City1 as the value of School, account creation should fail and an error message should be displayed.
Actual behavior: When I create a new user account and select City1 as the value of School, account creation succeeds and no error message is displayed.
Drupal Watchdog logs contain some errors, but I am not sure they are relevant:
drush ws
--------- -------------- ------ ---------- ---------------------------------------------
ID Date Type Severity Message
--------- -------------- ------ ---------- ---------------------------------------------
5298867 18/Oct 22:57 php Warning Warning: Illegal offset type in isset or empty in Drupal\Core\Entity\EntityStorageBase->load() (line 246 of /app/docroot/core/lib/Drupal/Core/Entity/EntityStorageBase.php) #0 /app/docroot/
5298866 18/Oct 22:57 php Notice Notice: Array to string conversion in Drupal\Core\Entity\EntityStorageBase->buildCacheId() (line 126 of /app/docroot/core/lib/Drupal/Core/Entity/EntityStorageBase.php) #0 /app/docroot/core
5298865 18/Oct 22:57 php Warning Warning: array_flip(): Can only flip STRING and INTEGER values! in Drupal\Core\Entity\EntityStorageBase->loadMultiple() (line 261 of /app/docroot/core/lib/Drupal/Core/Entity/EntityStorageB
5298864 18/Oct 22:57 php Notice Notice: iconv(): Wrong charset, conversion from `HTML-ENTITIES' to `UTF-8' is not allowed in twig_convert_encoding() (line 1009 of /app/vendor/twig/twig/src/Extension/CoreExtension.php) #0
5298863 18/Oct 22:57 php Notice Notice: iconv(): Wrong charset, conversion from `HTML-ENTITIES' to `UTF-8' is not allowed in twig_convert_encoding() (line 1009 of /app/vendor/twig/twig/src/Extension/CoreExtension.php) #0
5298862 18/Oct 22:57 php Notice Notice: iconv(): Wrong charset, conversion from `HTML-ENTITIES' to `UTF-8' is not allowed in twig_convert_encoding() (line 1009 of /app/vendor/twig/twig/src/Extension/CoreExtension.php) #0
5298861 18/Oct 22:57 php Notice Notice: iconv(): Wrong charset, conversion from `HTML-ENTITIES' to `UTF-8' is not allowed in twig_convert_encoding() (line 1009 of /app/vendor/twig/twig/src/Extension/CoreExtension.php) #0
5298860 18/Oct 22:57 php Notice Notice: iconv(): Wrong charset, conversion from `HTML-ENTITIES' to `UTF-8' is not allowed in twig_convert_encoding() (line 1009 of /app/vendor/twig/twig/src/Extension/CoreExtension.php) #0
5298859 18/Oct 22:57 php Notice Notice: iconv(): Wrong charset, conversion from `HTML-ENTITIES' to `UTF-8' is not allowed in twig_convert_encoding() (line 1009 of /app/vendor/twig/twig/src/Extension/CoreExtension.php) #0
5298858 18/Oct 22:57 php Notice Notice: iconv(): Wrong charset, conversion from `HTML-ENTITIES' to `UTF-8' is not allowed in twig_convert_encoding() (line 1009 of /app/vendor/twig/twig/src/Extension/CoreExtension.php) #0
--------- -------------- ------ ---------- ---------------------------------------------
I've been seeing the iconv() errors since upgrading this project from Drupal 8 to Drupal 9, so I do not think they are relevant. The top three error messages here may be related to the constraint validation, but they are also rather common errors in this project (and debugging them is a much lower priority than essential functionality due very soon).
Any ideas? Am I at least on the right track?
