Using Route Prefixes in Lumen - php

Question

From the Lumen 5.2 docs:
The prefix group attribute may be used to prefix each route in the
group with a given URI. For example, you may want to prefix all route
URIs within the group with admin:
$app->group(['prefix' => 'admin'], function () use ($app) {
$app->get('users', function () {
// Matches The "/admin/users" URL
});
});
My code:
$app->group(['prefix' => 'v1'], function () use ($app) {
$app->get('lessons', function () {
['as' => 'lessons.index', 'uses' => 'LessonsController#index'];
});
});
This returns a 200 but it is clearly not calling the index() method on the LessonsController.
I have also tried this:
$app->group(['prefix' => 'v1'], function () use ($app) {
$app->get('lessons', ['as' => 'lessons.index', 'uses' => 'LessonsController#index']);
});
Results in ReflectionException in Container.php line 738: Class LessonsController does not exist

Answer 1

I am currently using prefixes like this:
$app->group(['namespace' => "App\Http\Controllers", 'prefix' => 'v1'], function($app){
$app->get('/lessons', 'LessonsController#index');
});
Which works fine in my version of Lumen. You would access the url /v1/lessons and it is handled by the index() method inside the LessonsController
Note: It would appear that the Lumen documentation misses out that in order to do this you require the 'namespace' => "App\Http\Controllers" key value pair in order for this to work.