Codeigniter undefined property, can't load model into controller

Question

I am using CodeIgniter 3, I've seen similar problems on this website and tried every permutation of the solutions offered to no avail.

I am trying to create a table via the cli with CodeIgniter. But this results in an error I just cant seem to figure out, any help is greatly appreciated!

Model:

<?php
class App_model extends CI_Model {
  public function __construct(){
    parent::__construct();
    $this->load->database();
  }
  public function create_table(){
    $this->drop();
    $sql='CREATE TABLE app (
      id int(11) NOT NULL AUTO_INCREMENT,
      text text NOT NULL,
      PRIMARY KEY (id)
    );';
    $this->db->query($sql);
  }
  public function drop(){
    $this->db->query('DROP TABLE app');
  }
}
?>

Controller:

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class App extends CI_Controller {
    public function __contruct(){
      parent::__construct();
      $this->load->model('App_model');
    }
    public function test(){
      $this->App_model->create_table();
    }
}
?>

Terminal:

asergey91:~/workspace $ php index.php App test

A PHP Error was encountered

Severity:    Notice
Message:     Undefined property: App::$App_model
Filename:    /home/ubuntu/workspace/application/controllers/App.php
Line Number: 10

Backtrace:
        File: /home/ubuntu/workspace/application/controllers/App.php
        Line: 10
        Function: _error_handler

        File: /home/ubuntu/workspace/index.php
        Line: 292
        Function: require_once



Fatal error: Call to a member function create_table() on a non-object in /home/ubuntu/workspace/application/controllers/App.php on line 10

Call Stack:
    0.0003     255192   1. {main}() /home/ubuntu/workspace/index.php:0
    0.0010     317824   2. require_once('/home/ubuntu/workspace/system/core/CodeIgniter.php') /home/ubuntu/workspace/index.php:292
    0.0171    1549776   3. call_user_func_array:{/home/ubuntu/workspace/system/core/CodeIgniter.php:514}() /home/ubuntu/workspace/system/core/CodeIgniter.php:514
    0.0171    1550040   4. App->test() /home/ubuntu/workspace/system/core/CodeIgniter.php:514


A PHP Error was encountered

Severity:    Error
Message:     Call to a member function create_table() on a non-object
Filename:    /home/ubuntu/workspace/application/controllers/App.php
Line Number: 10

Backtrace:

Answer 1

As said in the comments : Your controller's file name must start with an uppercase. In your case, App_model.php. See http://codeigniter.com/userguide3/changelog.html

changed filenaming convention (class file names now must be Ucfirst and everything else in lowercase).

So change app_model.php to App_model.php

EDIT :

Also, In your controller, Watch the caps : $this->load->model('app_model') and $this->app_model->... . Don't use any caps unless it's in your filenames.

Remove the closing php tags.

And in the end, you have a typo function __contruct instead of function __construct()

Answer 2

In Codignitor 3 you need to use first letter capital for your file like:

app_model.php

Should be:

App_model.php