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How to add UniqueField constraint on integer field?

The title basically says it all. I have the following field definition in an Entity class:

$fields['code'] = BaseFieldDefinition::create('integer')         ->setLabel(t('unique code'))         ->setDescription(t('Some unique code'))         ->addConstraint('UniqueField')         ->setTranslatable(false)         ->setRequired(true)         ->setDisplayOptions('view', array(             'label' => 'above',             'weight' => 4,         ))         ->setDisplayOptions('form', array(             'weight' => 4,         ))         ->setDisplayConfigurable('form', true)         ->setDisplayConfigurable('view', true);

Creating a new entity in the UI works as expected as long as I do not set the code value to something already in the database. However, as soon as I try to create a new entity with an already existing value for code (thus triggering a constraint violation), I get the following error:

The website encountered an unexpected error. Please try again later. TypeError: Argument 1 passed to DrupalCoreFormFormState::setError() must be of the type array, null given, called in /var/www/html/web/core/lib/Drupal/Core/Field/WidgetBase.php on line 454 in DrupalCoreFormFormState->setError() (line 1156 of core/lib/Drupal/Core/Form/FormState.php).

If I change the field definition to use a string instead everything works as expected:

$fields['code'] = BaseFieldDefinition::create('string')         ->setLabel(t('unique code'))         ->setDescription(t('Some unique code'))         ->setSetting('max_length', 5)         ->addConstraint('UniqueField')         ->setTranslatable(false)         ->setRequired(true)         ->setDisplayOptions('view', array(             'label' => 'above',             'weight' => 4,         ))         ->setDisplayOptions('form', array(             'weight' => 4,         ))         ->setDisplayConfigurable('form', true)         ->setDisplayConfigurable('view', true);

So the question is how do I add a unique constraint for an integer field? Is there another validation class I can use, am I setting up my integer field definition wrong thus causing the error, or?

This article was republished from its original source.
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How to add UniqueField constraint on integer field?

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