Code Igniter Tutorial Error - php

Question

When i try to write and run the Code Igniter tutorial, it throws this error:
Call to undefined method News_model::get_news() in application\controllers\news.php on line 21
Here is line 21:
$data['news'] = $this->news_model->get_news($slug);
mews model
<?php
class News_model extends CI_Model {
public function __construct()
{
$this->load->database();
}
public function get_news($slug = FALSE)
{
if ($slug === FALSE)
{
$query = $this ->db->get('news')
return $query->result_array();
}
$query = $this->db->get_where('news', array('slug' => $slug));
return $query->row_array();
}
}

Answer 1

If you use your model in controller - you must write this code
$this->load->model('News_model');
$data['news'] = $this->News_model->get_news($slug);
And check line
parent::__construct();
in your controller __construct method.
(PHP does not instantiate the parent constructor automatically if the child defines a constructor, unless the child specifically instantiates the parent's constructor)
If you use model from another side your application you must write this code
$CI = &get_instance();
$CI->load->model('News_model');
$data['news'] = $CI->News_model->get_news($slug);

Answer 2

Without posting more code it looks like there are two things to check here.
First, you have to call the parent constructor in your model. So your News_model constructor should look like this:
function __construct()
{
parent::__construct();
$this->load->database();
}
Second, if the code for line 21 you posted above is correct, the model name has to match your class name. So line 21 should read:
$data['news'] = $this->News_model->get_news($slug);
Note the uppercase 'N' in News_model.
This is essential what yAnTar wrote but phrased differently. Hopefully you'll understand either one of them.

Answer 3

may this will help you
1.In your controller:-
parent::__construct();
$this->load->model('News_model ');
$data['news'] = $this->news_model->get_news($slug);
2.In Model:-
class News_model extends CI_Model {
public function __construct()
{
$this->load->database();
}
public function get_news($slug)
{
if ($slug)
{
$query = $this ->db->get('news')
return $query->result_array();
}
$query = $this->db->get_where('news', array('slug' => $slug));
return $query->row_array();
}
}

Answer 4

It seems model not loaded.
You have to load model before using it
Either in controller or in autoload array
In controller load model using
$this->load->model('model_name');
And in your case
$this->load->model('news_model');