safekat/ci4/app/Controllers/API/ItemsController.php

<?php

namespace App\Controllers\API;

use CodeIgniter\RESTful\ResourceController;
use CodeIgniter\API\ResponseTrait;
use App\Models\API\ItemModel;

class ItemsController extends ResourceController
{

    use ResponseTrait;

    public function index()
    {
        $model = new ItemModel();
        $data = $model->findAll();
        return $this->respond($data);
    }

    public function show($id = null)
    {
        $model = new ItemModel();
        $data = $model->find(['id' => $id]);
        if (!$data)
            return $this->failNotFound('No Data Found');
        return $this->respond($data[0]);
    }

    public function create()
    {
        helper(['form']);
        $rules = [
            'title' => 'required',
            'price' => 'required'
        ];
        $data = [
            'title' => $this->request->getVar('title'),
            'price' => $this->request->getVar('price')
        ];

        if (!$this->validate($rules))
            return $this->fail($this->validator->getErrors());
        $model = new ItemModel();
        $model->save($data);
        $response = [
            'status' => 201,
            'error' => null,
            'messages' => [
                'success' => 'Data Inserted'
            ]
        ];
        return $this->respondCreated($response);
    }

    public function update($id = null)
    {
        helper(['form']);
        $rules = [
            'title' => 'required',
            'price' => 'required'
        ];
        $data = [
            'title' => $this->request->getVar('title'),
            'price' => $this->request->getVar('price')
        ];

        if (!$this->validate($rules))
            return $this->fail($this->validator->getErrors());
        $model = new ItemModel();
        $find = $model->find(['id' => $id]);
        if (!$find)
            return $this->failNotFound('No Data Found');
        $model->update($id, $data);

        $response = [
            'status' => 200,
            'error' => null,
            'messages' => [
                'success' => 'Data updated'
            ]
        ];
        return $this->respond($response);
    }

    public function delete($id = null)
    {
        $model = new ItemModel();
        $find = $model->find(['id' => $id]);
        if (!$find)
            return $this->failNotFound('No Data Found');
        $model->delete($id);

        $response = [
            'status' => 200,
            'error' => null,
            'messages' => [
                'success' => 'Data deleted'
            ]
        ];
        return $this->respond($response);
    }
}