Question

Having a very strange issue with an error on a codeigniter site.

Fatal error: Call to undefined method Document::get_by_module()

The line of code causing this (in a controller) is:

$this->document_type->get_by_module('module1');

The constructor of the controller:

function __construct(){
    parent::__construct();
    $this->load->model('document','document_type');
}

The document_type class looks like this

class Document_type extends CI_Model {
    function Document_type () {
        parent::__construct();

    }       
    function get_by_module($prefix) {
        // code 
    }
}

The main issue I’m seeing is that it’s saying Document:: is the class, but it should be Document_type. I see no reason that it should be looking in the document class for that function.

If I remove loading of the ‘document’ class from the controller constructor, the error goes away (but other things break).

Not sure how something like that could be happening.

Answer 1

Looks like you are loading in the wrong model file. The line

$this->load->model('document','document_type');

means something along the lines of: Find me a model named “Document” create an instance and put under $this->document_type. (see the 4th example)

Looks like you have a Document model so the load succeeds, but if you don’t want to rename your instance put under the $this (controller instance) you shouldn’t use the second parameter in the $this->load->model() line.

Simply write $this->load->model('document_type');