Products.php

<?php

defined('BASEPATH') OR exit('No direct script access allowed');

class Products extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->model("product_model");
        $this->load->library('form_validation');

        $this->load->model("user_model");
        if($this->user_model->isNotLogin())
            redirect(site_url('admin/login'));
    }

    public function index()
    {
        $data["products"] = $this->product_model->getAll(); // ambil data dari model
        $this->load->view("admin/product/list", $data); // kirim data ke view
    }

    public function add()
    {
        $product = $this->product_model; // objek model
        $validation = $this->form_validation; // objek form validation
        $validation->set_rules($product->rules()); // terapkan rules

        if ($validation->run()) { // melakukan validasi
            $product->save(); // simpan data ke database
            $this->session->set_flashdata('success', 'Berhasil disimpan'); // tampilkan pesan berhasil
        }

        $this->load->view("admin/product/new_form"); // tampilkan form add
    }

    public function edit($id = null)
    {
        if (!isset($id)) redirect('admin/products'); // redirect jika tidak ada id

        $product = $this->product_model; // objek model
        $validation = $this->form_validation; // objek validation
        $validation->set_rules($product->rules()); // menerapkan rules

        if ($validation->run()) { // melakukan validasi
            $product->update(); // menyimpan data
            $this->session->set_flashdata('success', 'Berhasil disimpan');
        }

        $data["product"] = $product->getById($id); // mengambil data untuk ditampilkan pada form
        if (!$data["product"]) show_404(); // jika tidak ada data, tampilkan error 404

        $this->load->view("admin/product/edit_form", $data); // menampilkan form edit
    }

    public function delete ($id=null)
    {
        if (!isset($id)) show_404();

        if ($this->product_model->delete($id)) {
            redirect(site_url('admin/products'));
        }
    }
}