Laravel DI - Can't solve Construct() must implement interface problem

Question

I am trying to do dependency injection.

But when i call my BananaService i get error:

TypeError: Argument 1 passed to BananaService::\__construct() must be an instance of BananaFactory, instance of BananaModelFactory given.

which sounds quite logical, but it seemed to me that it should just return a BananaModelFactory class when it sees an BananaFactoryInterface, and not an error.

I have this BananaService:

class BananaService
{
    public function __construct(BananaFactory $factory) {
        $this->factory = $factory;
    }
}

My BananaFactoryInterface:

interface BananaFactory
{
    public function make(array $attributes = []): BananaEntity;
}

And BananaModelFactory:


class BananaModelFactory
{
    public function make(): BananaEntity
    {
        return new Banana($attributes);
    }
}

I also added the following code to the AppServiceProvider:

public function register()
{
    $this->app->bind(BananaFactory::class, BananaModelFactory::class);
}

pibocik125 · Accepted Answer · 2022-03-28 14:10:38Z

1

I forgot to do an implementation in my BananaModelFactory.

class BananaModelFactory implements BananaFactory {} instead of class BananaModelFactory {}.

I also found an excellent github gist in which it is written in detail about binding interfaces to implementation.

answered Mar 28, 2022 at 14:10

pibocik125

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