<?php

/**
 * @file
 * Contains unique_field_constraint_test.module.
 */

use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Database\Query\AlterableInterface;

/**
 * Implements hook_entity_base_field_info_alter().
 */
function unique_field_constraint_test_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) {
  if ($entity_type->id() === 'entity_test_string_id') {
    /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
    $fields['name']->addConstraint('UniqueField');
  }
  if ($entity_type->id() === 'entity_test') {
    /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
    $fields['name']->addConstraint('UniqueField');
  }
}

/**
 * Implements hook_query_entity_test_access_alter().
 */
function unique_field_constraint_test_query_entity_test_access_alter(AlterableInterface $query) {
  // Set an impossible condition to filter out all entities.
  /** @var \Drupal\Core\Database\Query\Select|\Drupal\Core\Database\Query\AlterableInterface $query */
  $query->condition('entity_test.id', 0);
}
