User.php

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

Class User extends Admin_Controller
{
    public function __construct()
    {
        parent::__construct();
        if(!$this->session->userdata('username'))
        {
            redirect('login');
        }
        $this->halaman = 'Data User';
    }
    public function index($page = null)
    {

        $users = $this->user->getAll();
        $halaman = $this->halaman;
        $main_view = 'user/index';
        $this->load->view('template', compact('halaman', 'main_view', 'users'));
    }
    public function create()
    {
        if(!$_POST)
        {
            $input = (object) $this->user->getDefaultValues();
        }
        else
        {
            $input = (object) $this->input->post(null, true);
        }

        if(!$this->user->validate())
        {
            $halaman = $this->halaman;
            $main_view = 'user/form';
            $form_action = 'user/create';

            $this->load->view('template', compact('halaman', 'main_view', 'form_action', 'input'));
            return;
        }

        // Hash password
        $input->password = md5($input->password);

        if($this->user->insert($input))
        {
            $this->session->set_flashdata('success', 'Data user berhasil disimpan.');
        }
        else
        {
            $this->session->set_flashdata('error', 'Data user gagal disimpan.');
        }

        redirect('user');
    }
    public function is_password_required()
    {
        $edit = $this->uri->segment(2);

        if($edit != 'edit')
        {
            $password = $this->input->post('password', true);
            if(empty($password))
            {
                $this->form_validation->set_message('is_password_required', '%s harus diisi.');
                return false;
            }
        }
        return true;
    }
    public function username_unik()
    {
        $username = $this->input->post('username');
        $id_user = $this->input->post('id_user');

        $this->user->where('username', $username);
        !$id_user || $this->user->where('id_user !=', $id_user);
        $user = $this->user->get();

        if(count($user))
        {
            $this->form_validation->set_message('username_unik', '%s sudah digunakan.');
            return false;
        }
        return true;
    }
    public function delete($id = null)
    {
        $user = $this->user->where('id_user', $id)->get();
        if(!$user)
        {
            $this->session->set_flashdata('warning', 'Data user tidak ada.');
            redirect('user');
        }

        if($this->user->where('id_user', $id)->delete())
        {
            $this->session->set_flashdata('success', 'Data user berhasil dihapus.');
        }
        else
        {
            $this->session->set_flashdata('error', 'Data user gagal dihapus.');
        }

        redirect('user');
    }
}