function SqlContentEntityStorageSchema::addSharedTableFieldUniqueKey

Adds a unique key for the specified field to the given schema definition.

Also adds a 'not null' constraint, because many databases do not reliably support unique keys on null columns.

Parameters

\Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition: The storage definition of the field to which to add a unique key.

array $schema: A reference to the schema array to be updated.

File

core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php, line 2194

Class

SqlContentEntityStorageSchema

Defines a schema handler that supports revisionable, translatable entities.

Namespace

Code

protected function addSharedTableFieldUniqueKey(FieldStorageDefinitionInterface $storage_definition, &$schema) {
    $name = $storage_definition->getName();
    $real_key = $this->getFieldSchemaIdentifierName($storage_definition->getTargetEntityTypeId(), $name);
    $schema['unique keys'][$real_key] = [
        $name,
    ];
    $schema['fields'][$name]['not null'] = TRUE;
}