requiresAtLeastOneElement example

->end()
            ->scalarNode('service')->end()
            ->arrayNode('user_providers')
                ->beforeNormalization()
                    ->ifString()->then(fn ($v) => [$v])
                ->end()
                ->prototype('scalar')->end()
            ->end()
            ->booleanNode('catch_exceptions')->defaultTrue()->end()
            ->arrayNode('signature_properties')
                ->prototype('scalar')->end()
                ->requiresAtLeastOneElement()
                ->info('An array of properties on your User that are used to sign the remember-me cookie. If any of these change, all existing cookies will become invalid.')
                ->example(['email', 'password'])
                ->defaultValue(['password'])
            ->end()
            ->arrayNode('token_provider')
                ->beforeNormalization()
                    ->ifString()->then(fn ($v) => ['service' => $v])
                ->end()
                ->children()
                    ->scalarNode('service')->info('The service ID of a custom rememberme token provider.')->end()
                    ->arrayNode('doctrine')
                        

->fixXmlConfig('default_role')
            ->children()
                ->scalarNode('service')->isRequired()->cannotBeEmpty()->defaultValue('ldap')->end()
                ->scalarNode('base_dn')->isRequired()->cannotBeEmpty()->end()
                ->scalarNode('search_dn')->defaultNull()->end()
                ->scalarNode('search_password')->defaultNull()->end()
                ->arrayNode('extra_fields')
                    ->prototype('scalar')->end()
                ->end()
                ->arrayNode('default_roles')
                    ->beforeNormalization()->ifString()->then(fn ($v) => preg_split('/\s*,\s*/', $v))->end()
                    ->requiresAtLeastOneElement()
                    ->prototype('scalar')->end()
                ->end()
                ->scalarNode('uid_key')->defaultValue('sAMAccountName')->end()
                ->scalarNode('filter')->defaultValue('({uid_key}={username})')->end()
                ->scalarNode('password_attribute')->defaultNull()->end()
            ->end()
        ;
    }
}

/** * @param array<AuthenticatorFactoryInterface> $factories */
    private function addFirewallsSection(ArrayNodeDefinition $rootNode, array $factories): void
    {
        $firewallNodeBuilder = $rootNode
            ->fixXmlConfig('firewall')
            ->children()
                ->arrayNode('firewalls')
                    ->isRequired()
                    ->requiresAtLeastOneElement()
                    ->disallowNewKeysInSubsequentConfigs()
                    ->useAttributeAsKey('name')
                    ->prototype('array')
                        ->fixXmlConfig('required_badge')
                        ->children()
        ;

        $firewallNodeBuilder
            ->scalarNode('pattern')
                ->beforeNormalization()
                    ->ifArray()
                    

->scalarNode('check_route')
                ->isRequired()
                ->info('Route that will validate the login link - e.g. "app_login_link_verify".')
            ->end()
            ->scalarNode('check_post_only')
                ->defaultFalse()
                ->info('If true, only HTTP POST requests to "check_route" will be handled by the authenticator.')
            ->end()
            ->arrayNode('signature_properties')
                ->isRequired()
                ->prototype('scalar')->end()
                ->requiresAtLeastOneElement()
                ->info('An array of properties on your User that are used to sign the link. If any of these change, all existing links will become invalid.')
                ->example(['email', 'password'])
            ->end()
            ->integerNode('lifetime')
                ->defaultValue(600)
                ->info('The lifetime of the login link in seconds.')
            ->end()
            ->integerNode('max_uses')
                ->defaultNull()
                ->info('Max number of times a login link can be used - null means unlimited within lifetime.')
            ->end()
            

if (\is_array($place) && \array_key_exists('name', $place)) {
                                                        continue;
                                                    }
                                                    $place['name'] = $name;
                                                    $places[$name] = $place;
                                                }

                                                return array_values($places);
                                            })
                                        ->end()
                                        ->isRequired()
                                        ->requiresAtLeastOneElement()
                                        ->prototype('array')
                                            ->children()
                                                ->scalarNode('name')
                                                    ->isRequired()
                                                    ->cannotBeEmpty()
                                                ->end()
                                                ->arrayNode('metadata')
                                                    ->normalizeKeys(false)
                                                    ->defaultValue([])
                                                    ->example(['color' => 'blue', 'description' => 'Workflow to manage article.'])
                                                    ->prototype('variable')
                                                    

class ConfigurationWithArrayNodeRequiringOneElement implements ConfigurationInterface
{
    public function getConfigTreeBuilder(): TreeBuilder
    {
        $treeBuilder = new TreeBuilder('env_extension');
        $treeBuilder->getRootNode()
            ->children()
                ->arrayNode('nodes')
                    ->isRequired()
                    ->requiresAtLeastOneElement()
                    ->scalarPrototype()->end()
                ->end()
            ->end();

        return $treeBuilder;
    }
}

class EnvExtension extends Extension
{
    private ConfigurationInterface $configuration;
    

'enabled' => true, 'foo' => 'bar'], [['enabled' => true]], 'An enableable node can be enabled'],
            [['enabled' => true, 'foo' => 'baz'], [['foo' => 'baz']], 'any configuration enables an enableable node'],
            [['enabled' => false, 'foo' => 'baz'], [['foo' => 'baz', 'enabled' => false]], 'An enableable node can be disabled'],
            [['enabled' => false, 'foo' => 'bar'], [false], 'false disables an enableable node'],
        ];
    }

    public function testRequiresAtLeastOneElement()
    {
        $node = new ArrayNodeDefinition('root');
        $node
            ->requiresAtLeastOneElement()
            ->integerPrototype();

        $node->getNode()->finalize([1]);

        $this->addToAssertionCount(1);
    }

    public function testCannotBeEmpty()
    {
        $this->expectException(InvalidConfigurationException::class);
        $this->expectExceptionMessage('The path "root" should have at least 1 element(s) defined.');
        

if (\is_array($value) && \array_key_exists('name', $value)) {
                                    continue;
                                }
                                $value['name'] = $name;
                                $values[$name] = $value;
                            }

                            return array_values($values);
                        })
                    ->end()
                    ->isRequired()
                    ->requiresAtLeastOneElement()
                    ->prototype('array')
                        ->children()
                            ->scalarNode('name')
                                ->isRequired()
                                ->cannotBeEmpty()
                            ->end()
                            ->arrayNode('data')
                                ->normalizeKeys(false)
                                ->defaultValue([])
                                ->prototype('variable')->end()
                            ->end()
                        

->end()
                ->arrayNode('messenger')
                    ->children()
                        ->arrayNode('routing')
                            ->normalizeKeys(false)
                            ->useAttributeAsKey('message_class')
                            ->prototype('array')
                                ->performNoDeepMerging()
                                ->fixXmlConfig('sender')
                                ->children()
                                    ->arrayNode('senders')
                                        ->requiresAtLeastOneElement()
                                        ->prototype('scalar')->end()
                                    ->end()
                                ->end()
                            ->end()
                        ->end()
                        ->arrayNode('receiving')
                            ->prototype('array')
                                ->children()
                                    ->integerNode('priority')->end()
                                    ->scalarNode('color')->end()
                                ->end()
                            

        return 'custom_authenticators';
    }

    /** * @param ArrayNodeDefinition $builder */
    public function addConfiguration(NodeDefinition $builder): void
    {
        $builder
            ->info('An array of service ids for all of your "authenticators"')
            ->requiresAtLeastOneElement()
            ->prototype('scalar')->end();

        // get the parent array node builder ("firewalls") from inside the children builder         $factoryRootNode = $builder->end()->end();
        $factoryRootNode
            ->fixXmlConfig('custom_authenticator')
            ->validate()
                ->ifTrue(fn ($v) => isset($v['custom_authenticators']) && empty($v['custom_authenticators']))
                ->then(function D$v) {
                    unset($v['custom_authenticators']);