Dependency Injection Slim Framework 3

Question

I\'m using Slim Framework 3 to create an API. The app structure is: MVCP (Model, View, Controller, Providers).

Is it possible to have Slim Dependency Inject

Answer 1

When you reference a class in the route callable Slim will ask the DIC for it. If the DIC doesn't have a registration for that class name, then it will instantiate the class itself, passing the container as the only argument to the class.

Hence, to inject the correct dependencies for your controller, you just have to create your own DIC factory:

$container = $app->getContainer();
$container['\Controllers\PeopleController'] = function ($c) {
    $peopleService = $c->get('\Services\PeopleService');
    return new Controllers\PeopleController($c, $peopleService);
};

Of course, you now need a DIC factory for the PeopleService:

$container['\Services\PeopleService'] = function ($c) {
    $peopleModel = new Models\PeopleModel;
    $addressModel = new Models\AddressModel;
    $autoModel = new Models\AutoModel;
    return new Services\PeopleService($peopleModel, $addressModel, $autoModel);
};

(If PeopleModel, AddressModel, or AutoModel had dependencies, then you would create DIC factories for those too.)