Allowing key-value pairs in Symfony 2 Bundle semantic configuration

You should add useAttributeAsKey('name') to your billing node configuration in Configurator.php.

More information about useAttributeAsKey() you can read at Symfony API Documentation

After changes billing node configuration it should be like:

->arrayNode('billings')    ->isRequired()    ->requiresAtLeastOneElement()    ->useAttributeAsKey('name')    ->prototype('scalar')->end()->end()

You may add something like:

->arrayNode('billings')    ->useAttributeAsKey('whatever')    ->prototype('scalar')->end()

After that keys will magically appear.

See: https://github.com/symfony/symfony/issues/12304

I recently had to setup some nested arrays configuration.

Needs were

• A first level array with custom keys (discribing an entity path)
• Each of those arrays had to have one or more arbitrary tags as keys, with boolean value.

To achieve such a configuration, you have to casacade prototype() method.

So, the following configuration:

my_bundle:    some_scalar: my_scalar_value    first_level:        "AppBundle:User":            first_tag: false        "AppBundle:Admin":            second_tag: true            third_tag: false

can be obtained using the following configuration:

$treeBuilder = new TreeBuilder();$rootNode = $treeBuilder->root('my_bundle');$rootNode    ->addDefaultsIfNotSet() # may or may not apply to your needs    ->performNoDeepMerging() # may or may not apply to your needs    ->children()        ->scalarNode('some_scalar')            ->info("Some useful tips ..")            ->defaultValue('default')            ->end()        ->arrayNode('first_level')            ->info('Useful tips here..')            # first_level expects its children to be arrays            # with arbitrary key names            ->prototype('array')                # Those arrays are expected to hold one or more boolean entr(y|ies)                # with arbitrary key names                ->prototype('boolean')                    ->defaultFalse()->end()                ->end()            ->end()        ->end()    ->end();return $treeBuilder;

Dumping $config from inside the extension class gives the following output:

Array(    [some_scalar] => my_scalar_value    [first_level] => Array        (            [AppBundle:User] => Array                (                    [first_tag] =>                 )            [AppBundle:Admin] => Array                (                    [second_tag] => 1                    [third_tag] =>                 )        ))

And voilà !