Codeigniter Vote Candidate Function - php

Question

i try to make a candidate vote system on Codeigniter. Each user only can vote 1 candidate, and after vote the candidate user status will change from '1' to '0' so user cant vote again. Can someone help me to create this function ?
Here is my code.
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Admin_calon extends CI_Controller
{
function __construct() {
parent::__construct();
$this->load->model('Admin_dcalon');
$this->load->model('Admin_dvoter');
$this->load->model('Voter_model');
$this->load->helper('url');
$this->load->database();
}
public function index() {
$data['calon'] = $this->Admin_dcalon->tampil_data()->result();
$this->load->view('Admin_calon',$data);
}
function tambah_calon(){
$nama = $this->input->post('nama');
$config['upload_path'] = base_url(). './uploads/';
$config['allowed_types'] = 'jpg|png|jpeg';
$config['max_size'] = '0';
$this->load->library('upload', $config);
$this->upload->initialize($config);
$this->upload->do_upload();
$img = $this->input->post('img');
$data = array(
'nama' => $nama,
'img' => $img,
'voted' => 0
);
$this->session->set_flashdata('msg','<div class="alert alert-success text-center">Data Tersimpan</div>');
$this->Admin_dcalon->tambah_data($data,'calon');
redirect('Admin_calon');
}
public function delete_calon($id_calon){
$where = array('id_calon' => $id_calon);
$this->Admin_dcalon->hapus_data($where,'calon');
$this->session->set_flashdata('msg','<div class="alert alert-danger text-center">Data Terhapus</div>');
redirect('Admin_calon');
}
function edit_calon($id_calon){
$where = array('id_calon' => $id_calon);
$data['calon'] = $this->Admin_dcalon->edit_data($where,'calon')->result();
$this->load->view('Admin_ecalon',$data);
}
function update_calon(){
$id_calon = $this->input->post('id_calon');
$nama = $this->input->post('nama');
$img = $this->input->post('img');
$data = array(
'nama' => $nama,
'img' => $img,
);
$where = array(
'id_calon' => $id_calon
);
$this->session->set_flashdata('msg','<div class="alert alert-info text-center">Perubahan Tersimpan</div>');
$this->Admin_dcalon->update_data($where,$data,'calon');
redirect('Admin_calon');
}
function vote_calon(){
$id_calon = $this->input->post('id_calon');
$voted = $this->input->post('voted');
$data = array(
'id_calon' => $id_calon,
'voted' => +1
);
$where = array(
'id_calon' => $id_calon,
);
$this->Admin_dcalon->vote_calon($where,$data,'calon');
redirect('voter/voter_sukses');
}
public function logout() {
$data = ['id_admin', 'username'];
$this->session->unset_userdata($data);
redirect ('Admin_login');
}
}
?>
and this Model code.
<?php
class Admin_dcalon extends CI_Model{
function tampil_data(){
$this->db->select('*');
$this->db->from('calon');
return $this->db->get();
}
function tambah_data($data,$table){
$this->db->insert($table,$data);
}
function hapus_data($where,$table){
$this->db->where($where);
$this->db->delete($table);
}
function edit_data($where,$table){
return $this->db->get_where($table,$where);
}
function update_data($where,$data,$table){
$this->db->where($where);
$this->db->update($table,$data);
}
function vote_calon($where,$data,$table)
{
$this->db->where($where);
$this->db->update($table,$data);
}
}
?>
Please help me. Thanks for every one.
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