What I'm trying to do on the surface seems simple, basic OOP PHP but I just can't get it working. I have a controller class which is calling a model, that model extends another model of mine but it throws an error saying it can't find it:
Controller (Welcome.php):
public function __construct()
{
parent::__construct();
$this->load->model('users_model');
}
public function index()
{
$this->users_model->getAll();
}
Users Model (User_model.php):
class Users_model extends Base_model
{
public function __construct()
{
parent::__construct();
}
}
Base Model (Base_model.php):
class Base_model extends CI_Model
{
public function __construct()
{
parent::__construct();
$this->load->database();
}
public function getAll($table)
{
$query = $this->db->query('Query here');
return $query;
}
}
This gives me the error Fatal error: Class 'base_model' not found in /ci/application/models/Users_model.php on line 3
Save your Base_model in application/core named as Base_model.php with following code.
class Base_model extends CI_Model
{
public function __construct()
{
parent::__construct();
$this->load->database();
}
public function getAll($table=FALSE)
{
$query = $this->db->query('Query here');
return $query;
}
}
Save User_model in application/models named as User_model.php having following code
class User_model extends Base_model
{
public function __construct()
{
parent::__construct();
}
}
Then make a controller Welcome.php in appliation/controllers having following code with extending CI_Controller
public function __construct()
{
parent::__construct();
$this->load->model('user_model');//loads user_model
}
public function index()
{
$data = $this->user_model->getAll(); //need a variable to hold return data
}
You just have to locate the Base_model in your Users_model like below code and you can access the functions of base model easily.
require('application/models/base_model.php');
class User_model extends Base_model
{
function __construct()
{
parent::__construct();
}
}
Related
I have a MY_Controller php file with MY_Controller class and Other_Controller that extends My_Controller class in my application/core folder.
class MY_Controller extends CI_Controller
{
function __construct()
{
parent::__construct();
}
function SomeMethod()
{
echo "method MY_Controller";
}
}
class Other_Controller extends My_Controller
{
function __construct()
{
parent::__construct();
}
}
On my Application/controller folder :
Class Main extends Other_Controller
{ include(APPPATH.'core/Other_Controller.php');
function __construct()
{
parent::__construct();
// Call SomeMethod function name?
}
}
Can I call SomeMethod function from MY_Controller to Main Controller?
Yes, you can, simply use parent keyword same way as you're using it with constructor:
class Main extends Other_Controller
{
function __construct()
{
parent::__construct();
parent::SomeMethod(); // echoes "method MY_Controller"
}
}
In case Other_Controller class overrides MY_Controller::SomeMethod, you still can call the original SomeMethod from the Main class by using full class name and scope resolution operator :::
class MY_Controller extends CI_Controller
{
function __construct()
{
parent::__construct();
}
function SomeMethod()
{
echo "method MY_Controller";
}
}
class Other_Controller extends My_Controller
{
function __construct()
{
parent::__construct();
}
function SomeMethod()
{
echo "method Other_Controller";
}
}
class Main extends Other_Controller
{
function __construct()
{
parent::__construct();
parent::SomeMethod(); // echoes "method Other_Controller"
MY_Controller::SomeMethod(); // echoes "method MY_Controller"
}
}
Model :
class Users_model extends CI_Model {
function __construct() {
parent::__construct();
$this->load->database();
}
public function get_all_users() {
return $this->db->get('users');
}
}
Controller :
class Users extends CI_Controller {
function __construct() {
parent::__construct();
$this->load->helper('form');
$this->load->helper('url');
$this->load->helper('security');
$this->load->model('Users_model');
}
public function index() {
redirect('users/view_users');
}
public function view_users() {
$data['query'] = $this->Users_model->get_all_users();
$this->load->view('users/view_all_users', $data);
}
}
My question is where should i put the $this->load->database? In Model or Constructor? If possible tell me why?
And one more question, if i omit the $this->load->database, the error shown
"Undefined property: Users::$db". I'm expecting "Undefined property:
Users_model::$db".
Why is that? Is it looking for $db in both controller or model?
Thank you.
Note: i can connect to database just fine. What im actually ask is if i want to use $this->load->database(). Where should i put it? Controller or Model? And why?
You can either load the database in the controller or you can load it in the model.There's not much of a difference its just more neat and clean that all the interaction in the database is in the model and the controllers the one who connects both views and model.The controller here is like a middleman between the buyer and the seller.
load database in the controller
<?php
class Test_controller extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->database('default');
$this->load->model('test_model');
}
public function index()
{
$this->db->from('test');
$query = $this->db->get();
echo "<title>CodeIgniter SQlite</title>";
$data['db']=$query->result();
//print_r($data['db']);
$count = count($data['db']);
echo "Row count: $count rows<br>";
for ($i=0; $i < $count; $i++) {
echo $data['db'][$i]->text." ";
}
}
}
?>
load database in the model
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Test_model extends CI_Model
{
public $table1 = 'test';
public $table2 = '';
public function __construct()
{
parent::__construct();
$this->load->database('default');
}
public function check_db()
{
$this->db->from($this->table1);
$query = $this->db->get();
return $query->result();
}
}
Go to autoload.php in application/config/autoload.php and add this
$autoload['libraries'] = array('database'); // add database in array(now you dont need to load database at anywhere in project)
Make database connection settings in database.php, file located atapplication/config/database.php
now try this
class Users_model extends CI_Model {
function __construct() {
parent::__construct();
//$this->load->database(); <----remove this
}
public function get_all_users() {
return $this->db->get('users');
}
}
So here is my controller:
class Search extends CI_Controller {
public function __construct() {
parent::__construct();
$this->load->model('search_model');
$this->search_model->search_result = $_POST;
}
public function index()
{
$data['results'] = $this->search_model->get_results();
$this->load->view('search_results', $data);
}
And here is my model:
class Search_model extends CI_Model {
protected $search_query;
function __construct($search_query)
{
parent::__construct();
$this->load->database();
$this->search_query = $search_query;
}
But this doesn't seem to work. What I want to do is pass the posted form ($_POST) to my model, then do stuff with it. But it seems messy to pass $_POST to each method of my model. My plan is to extract the variables sent with $_POST and construct these as properties such as $website_url, $text_query etc..., then call these in methods with $this->website_url;
I'm relatively new to CodeIgniter so just getting to grips with the basics
for your special purpose you can try this code
Controller:
class Search extends CI_Controller {
public function __construct() {
parent::__construct();
$this->load->model('search_model');
$this->init();
}
private function init()
{
$this->search_model->init( $this->input->post() );
}
public function index()
{
$data['results'] = $this->search_model->get_results();
$this->load->view('search_results', $data);
}
model:
class Search_model extends CI_Model {
protected $search_query;
function __construct()
{
parent::__construct();
$this->load->database();
}
public function init( $search_query )
{
$this->search_query = $search_query;
}
you have protected $search_query; which you can't access it from your controller.
You either have to change it to public or create getter and setter for it. or just getter depending on your domain/business logic.
And it should have been obvious as you should get an error saying
Fatal error: Cannot access protected property in file some/path/to/file!
Don't put the 'search query' in your model constructor.
Controller:
class Search extends CI_Controller {
public function __construct() {
parent::__construct();
$this->load->model('search_model');
}
public function index()
{
if ($this->input->server('REQUEST_METHOD') == 'POST')
{
// you should probably validate/clean the post data instead
// of sending it straight to the model
$results = $this->search_model->get_where($_POST);
}
else
{
// if it's not a post, you probably need something...
// either here, or somewhere in your view to handle empty data
$results = array();
}
$data['results'] = $results
$this->load->view('search_results', $data);
}
Your Model:
class Search_model extends CI_Model {
function __construct()
{
parent::__construct();
$this->load->database(); // <--- you may want to autoload 'database' library
}
function get_where($where)
{
$this->db->where($where);
// add select, order, joins, etc here
return $this->db->get('mytable'); // whatever your table name is
}
I try to use the $layout property in my controllers, but I always get the following error:
Call to a member function nest() on a non-object
When dd() the value of this->layout, it seems like it is only a string.
Here's my code:
base.php
class Base_Controller extends Controller {
public $layout = 'layouts.common';
}
admin.php
class Admin_Controller extends Base_Controller {
public function action_index() {
$this->layout->nest('content', 'admin.home');
}
}
I probably miss something, but I can't find it in the docs
Ahhh, just found the trouble. I was ovewritting __construct to add filters, but wasn't calling the parent construct:
class Admin_Controller extends Base_Controller {
public function __construct() {
parent::__construct();
$this->filter('before', 'auth');
}
public function action_index() {
$this->layout->nest('content', 'admin.home');
}
}
I'm trying out codeigniter for the first time on a MAMP deployment however I'm unable to load a model into a controller. The end result is always...
Unable to locate the model you have specified: second_model
Controller - welcome.php
class Welcome extends CI_Controller {
public function index()
{
$this->load->model('second_model');
$this->load->view('welcome_message');
}
}
Model - second_model.php
class Second_model extends Model {
public function __construct()
{
// model constructor
parent::__construct();
}
}
You should be extending CI_Model rather than Model
So:
class Second_model extends CI_Model {
public function __construct()
{
// model constructor
parent::__construct();
}
}