Documentation

IsbnUniqueAcrossCollections extends Constraint
in package

Application

FinalYes

Provides an ISBN Unique Across Collections constraint.

Tags

#[Constraint]: $id: 'IsbnUniqueAcrossCollections'; $label: new \Drupal\Core\StringTranslation\TranslatableMarkup('ISBN Unique Across Collections', options: ['context' => 'Validation'])

Table of Contents

Properties

$message : string: The message to display.

$message

The message to display.


        public
            string
    $message
     = 'ISBN numbers must be unique across collections.'

The message to display during validation.

On this page

Table Of Contents
- Properties
Properties
- $message