Why my interface is not instantiable when handle a command? - php

Question

Laravel CQRS
I am applying CQRS in Laravel just to learn how to use it.
I created a simple user registration and a controller that creates a command to dispatch the handle and use the right use case.
When Trying to use the interface in the controller, it looks like that I need to bind the interface and the implementation because it doesn't know which one to use but in this case I don't really understand how to bind the interface.
CreateUserController.php
<?php
declare(strict_types=1);
namespace App\Http\Controllers\User;
use App\Http\Controllers\Controller;
use App\Http\Requests\Users\CreateUserRequest;
use Illuminate\Http\RedirectResponse;
class CreateUserController extends Controller
{
public function __construct(private \Src\User\Infrastructure\CreateUserController $userController)
{
}
public function __invoke(CreateUserRequest $request): RedirectResponse
{
$this->userController->__invoke($request);
return redirect()->route('verify');
}
}
Src\User\Infrastructure\CreateUserController
<?php
declare(strict_types=1);
namespace Src\User\Infrastructure;
use App\Http\Requests\Users\CreateUserRequest;
use Src\Shared\Domain\Bus\Command\CommandBus;
use Src\User\Application\Create\CreateUserCommand;
final class CreateUserController
{
public function __construct(private CommandBus $commandBus)
{
}
public function __invoke(CreateUserRequest $request)
{
$name = $request->name;
$email = $request->email;
$password = $request->password;
$command = new CreateUserCommand($name, $email, $password);
$this->commandBus->dispatch($command);
}
}
CommandBus
<?php
declare(strict_types=1);
namespace Src\Shared\Domain\Bus\Command;
interface CommandBus
{
public function dispatch(Command $command): void;
}
Command
<?php
declare(strict_types=1);
namespace Src\Shared\Domain\Bus\Command;
interface Command
{
}
CreateUserCommandHandler
<?php
declare(strict_types=1);
namespace Src\User\Application\Create;
use Src\User\Domain\ValueObjects\UserEmail;
use Src\User\Domain\ValueObjects\UserName;
use Src\User\Domain\ValueObjects\UserPassword;
final class CreateUserCommandHandler
{
public function __construct(
private UserCreator $creator
)
{
}
public function __invoke(CreateUserCommand $command)
{
$name = new UserName($command->name());
$email = new UserEmail($command->email());
$password = new UserPassword($command->password());
$this->creator->__invoke($name, $email, $password);
}
}
The Error
I tried this:
<?php
namespace App\Providers;
use Illuminate\Support\ServiceProvider;
use Src\Shared\Domain\Bus\Command\Command;
use Src\User\Application\Create\CreateUserCommand;
class AppServiceProvider extends ServiceProvider
{
/**
* Register any application services.
*
* #return void
*/
public function register()
{
$this->app->bind(
Command::class,
CreateUserCommand::class
);
}
/**
* Bootstrap any application services.
*
* #return void
*/
public function boot()
{
//
}
}

Answer 1

Here is how you can bind with the interface.
Create a class in app/Providers folder. You can give any name to this class. Eg. InterfaceServiceProvider. extends it with Illuminate\Support\ServiceProvider
namespace App\Providers;
use Illuminate\Support\ServiceProvider;
class InterfaceServiceProvider extends ServiceProvider
{
/**
* Register services.
*
* #return void
*/
public function register()
{
$this->app->bind(YourInterFace::class, YourController::class);
}
/**
* Bootstrap services.
*
* #return void
*/
public function boot()
{
//
}
}
Add this InterfaceServiceProvider in config/app.php in providers array
Eg.
'providers' => [
App\Providers\InterfaceServiceProvider::class,
]