Laravel 5.5 dependency injection with constructor methods

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?

What are the $owner and $licence types? Laravel don't know what to inject to build your KDataService. — Andre Gusmao
– Andre Gusmao, Commented Oct 13, 2017 at 13:12

FreeLightman · Accepted Answer · 2017-10-13 13:24:41Z

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.

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