Laravel 5.5 dependency injection with constructor methods - php

Question

I have created a service in app/services/KDataService.php that looks like this:
class KDataService
{
/** #var string */
private $license;
/** #var string */
private $owner;
/** #var string */
private $accessToken;
public function __construct($owner, $license)
{
$this->owner = $owner;
$this->license = $license;
...
}
...
}
In one of my controller I try to inject this service with the dependency injection pattern but I get the following error:
Unresolvable dependency resolving [Parameter #0 [ $owner ]] in class App\Services\KDataService
My controller:
use App\Services\KDataService;
class DamagePointController extends Controller
{
/** #var KDataService $kDataService */
private $kDataService;
/**
* Instantiate a new controller instance.
*
* #param KDataService $kDataService
*/
public function __construct(KDataService $kDataService)
{
$this->kDataService = $kDataService;
}
...
}
Anyone knows how I can pass my $owner and $license?

Answer 1

The problem is that your service has arguments but you don't specify them. There are several ways to do this.
Using service provider:
namespace App\Providers;
use Riak\Connection;
use Illuminate\Support\ServiceProvider;
class kDataServiceServiceProvider extends ServiceProvider
{
/**
* Register bindings in the container.
*
* #return void
*/
public function register()
{
$this->app->bind(KDataService::class, function ($app) {
return new KDataService(getOwner(), getLicense());
});
}
}
bind could be change to other methods. See Service Container docs.
Using app to make instanse:
/* Controller __construct */
$this->kDataService = \App::make(KDataService::class, [getOwner(), getLicense()]);
Simply create class instance
/* Controller __construct */
$this->kDataService = new KDataService(getOwner(), getLicense());
Note: getOwner and getLicense change to your logic. Usually you can retrieve it within controller or from $app.
Generally what you need to resolve the issue is to read about service container and service providers in docs.