TranslatorTrait

You can get access to translation services without requesting Translator dependency but using TranslatorTrait which can work with any of your Components (Controllers, Services, Commands).

Translator trait and domain routing

Such trait defines method say which works as proxy to trasn method of translator.

class HomeController extends Controller
{
    use TranslatorTrait;

    public function indexAction()
    {
        echo $this->say('Hello world');
    }
}

Say method can be indexed by 'i18n:index' command.

Domain routing

Every message generated by such trait will be associated with bundle name based on your class and namespace.

For example class Controlers\HomeController will get bundle name "controllers-home-controller". Use translator config to associate this bundle with messages domain:

'domains'          => [
    'controller-messages' => [
        'controllers-home-controller',

        //We can also use star syntax
        'controllers-*'
    ],

    'spiral'     => [
        'spiral-*',
        'view-spiral-*',
        /*{{domain.spiral}}*/
    ],
    'profiler'   => [
        'view-profiler-*',
        /*{{domain.profiler}}*/
    ],
    'views'      => [
        'view-*',
        /*{{domain.views}}*/
    ],

    //Fallback domain
    'messages'   => ['*'],
],

Class messages

In cases where message is defined by logic and can not be indexed use constants and/or properties to declare class messages, every string wrapped with [[]] will be automatically indexed.

class HomeController extends Controller
{
    use TranslatorTrait;

    const MESSAGES = [
        'error'   => '[[An error]]',
        'success' => '[[Success]]'
    ];

    public function indexAction()
    {
        echo $this->say(self::MESSAGES['error']);
    }
}

Error Messages

Http RequestFilters and other ValidatesEntity models support ability to define custom validation messages with automatic translation:

class SampleRequest extends RequestFilter
{
    const SCHEMA = [
        'name'    => 'data:name',
        'status'  => 'data:status'
    ];

    const SETTERS = [
        'name'    => 'trim',
        'status'  => 'trim'
    ];

    const VALIDATES= [
        'name'    => [
            ['notEmpty', 'error' => '[[Name is required]]'],
        ],
        'status'  => [
            'notEmpty',
            ['in_array', ['active', 'disabled'], 'error' => '[[Invalid status value]]']
        ]
    ];
}

Errors messages will be translated into proper user locale inside getErrors method.