Use Factory Pattern in Laravel - laravel

Question

I am working on a Laravel project and want to implement Factory and Repository pattern in my project. However, I still don't know where should I use Factory pattern? It's still very confusing. I understand that it's not necessary to use the Factory pattern for every single project but as a part of my study, I want to learn more about the combination of this 2 patterns. This is my code example. Hope I can get help and explains from you guys. Thank you.
class ProductFactory
{
public function create()
{
return new Product;
}
}
class ProductRepository implements ProductRepositoryInterface
{
protected $productFactory;
public function __contruct(
ProductFactory $productFactory
)
{
$this->productFactory = $productFactory
}
public function all()
{
return Product::all();
}
public function loadById($id);
{
return Product::find($id);
}
public function save($data,$id=NULL)
{
if($id != NULL){
$product = $this->loadById($id)
}
else{
$product = $this->productFactory->create();
}
return $product->fill($data)->save();
}
.....
}

Answer 1

I think you need to split the factory and repository. For example:
class ProductRepository implements ProductRepositoryInterface
{
protected $product;
public function __contruct(Product $product)
{
$this->product = $product;
}
//...
}
But not necessary for DI in repository, your methods like all(), find() and etc. put in AbstractRepository. Your ProductRepositry:
class ProductRepository extends AbstractRepository implements ProductRepositoryInterface
{
public function __contruct()
{
//model property in AbstractRepository
$this->model = new Product();
}
}
If you want to write test for it, you may use laravel container:
AppServiceProvider:
$this->app->bind(Product::class, function ($app) {
return new Product();
});
ProductRepository:
$this->model = app()->make(Product::class);
PS: i think factory useless, in most cases i use container. But in some difficult cases i use factory, for example:
class ProductFactory
{
public static function create(int $type, array $attributes): ProductInterface
{
switch ($type) {
case 'market':
return new MarketProductModel($attributes);
break;
case 'shop':
$model = new ShopProductModel($attributes);
$model->setMathCoef(1.2);
return $model;
break;
case 'something':
return new SomethingProductModel($attributes);
break;
}
}
}