Repository 패턴

// app/Interfaces/PostRepositoryInterface.php
namespace App\Interfaces;

interface PostRepositoryInterface
{
    public function findAll(): array;
    public function findById(int $id): ?object;
    public function create(array $data): int|false;
    public function update(int $id, array $data): bool;
    public function delete(int $id): bool;
    public function findRecent(int $limit = 10): array;
}

// app/Repositories/PostRepository.php
namespace App\Repositories;

use App\Interfaces\PostRepositoryInterface;
use App\Models\PostModel;

class PostRepository implements PostRepositoryInterface
{
    public function __construct(private PostModel $model) {}

    public function findAll(): array
    {
        return $this->model->orderBy('id', 'DESC')->findAll();
    }

    public function findById(int $id): ?object
    {
        return $this->model->find($id);
    }

    public function create(array $data): int|false
    {
        if (! $this->model->insert($data)) return false;
        return (int) $this->model->getInsertID();
    }

    public function update(int $id, array $data): bool
    {
        return $this->model->update($id, $data);
    }

    public function delete(int $id): bool
    {
        return (bool) $this->model->delete($id);
    }

    public function findRecent(int $limit = 10): array
    {
        return $this->model->orderBy('id', 'DESC')->findAll($limit);
    }
}

// app/Controllers/Examples/Repository.php
class Repository extends BaseController
{
    private PostRepositoryInterface $repo;

    public function __construct()
    {
        // Interface 타입 힌트, 구현체 주입 (DI 컨테이너로 교체 가능)
        $this->repo = new PostRepository(new PostModel());
    }

    public function list()
    {
        $posts = $this->repo->findRecent(10);
        return $this->response->setJSON([...]);
    }

    public function store()
    {
        $id = $this->repo->create($this->request->getPost());
        return $this->response->setJSON(['id' => $id]);
    }
}

전형적인 계층 구조

┌─────────────────────────────────────┐
│  Controller (HTTP 입출력 처리)       │
└─────────────┬───────────────────────┘
              ↓
┌─────────────────────────────────────┐
│  Service Layer (비즈니스 로직)        │
└─────────────┬───────────────────────┘
              ↓
┌─────────────────────────────────────┐
│  Repository (Interface)             │
└─────────────┬───────────────────────┘
              ↓
┌─────────────────────────────────────┐
│  Model / Query Builder / DB         │
└─────────────────────────────────────┘