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ngmy avatar ngmy commented on July 16, 2024 1

I want to know too.
I am reading your wonderful book and repository.

I created a data transformer for a collection class in my project.

Application service:

public function execute($request = null)
{
    // ...
    $users = // ...
    return $this->usersDataTransformer->write($users)->read(); 
}

Data transformer for a collection class:

class UsersDtoDataTransformer implements UsersDataTransformer
{
    private $users;
    private $userDataTransformer;

    public function __construct(UserDtoDataTransformer $userDataTransformer)
    {
        $this->userDataTransformer = $userDataTransformer;
    }

    public function write(Users $users): self
    {
        $this->users = $users;
        return $this;
    }

    public function read()
    {
        // Should I wrap this with a DTO?
        return array_map(function (User $user): object {
            return $this->userDataTransformer->write($user)->read();
        }, $this->users->toArray());
    }
}

If pagination is needed, I created a data transformer in the infrastructure layer.
This transformer translates into a paginator.

namespace MyApp\Infrastructure\Application\DataTransformer\User;

// uses...

class UsersLaravelLengthAwarePaginatorDataTransformer implements UsersDataTransformer
{
    private $users;
    private $usersDataTransformer;
    private $perPage = 10;
    private $currentPage;
    private $options;

    public function __construct(UsersDtoDataTransformer $usersDataTransformer)
    {
        $this->usersDataTransformer = $usersDataTransformer;
        $this->currentPage = LengthAwarePaginator::resolveCurrentPage();
        $this->options = [
            'path' => LengthAwarePaginator::resolveCurrentPath(),
        ];
    }

    public function setPerPage(int $perPage): self
    {
        $this->perPage = $perPage;
        return $this;
    }

    public function write(Users $users): self
    {
        $this->users = $users;
        return $this;
    }

    public function read()
    {
        $users = $this->usersDataTransformer->write($this->users)->read();
        // Should I wrap it with a DTO?
        return new LengthAwarePaginator(
            array_slice(
                $users,
                $this->perPage * ($this->currentPage - 1),
                $this->perPage
            ),
            count($users),
            $this->perPage,
            $this->currentPage,
            $this->options
        );
    }
}

I have following questions.

  1. Is the above code a good idea?
  2. Should I build a paginator outside of DDD? (For example, a controller or view model of a web application framework)
  3. Should an application service translate one aggregation (or collection) into a DTO? Or should an application service translate all data needed by a view (multiple aggregations) into a DTO?

from last-wishes.

gitmood avatar gitmood commented on July 16, 2024

Thanks for opening this issue. Once closed, we will ask you and to all participants to provide open feedback about your experience. Thanks in advance!

from last-wishes.

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