Fatal error: Cannot redeclare class ContentModelArticles

Question

I tried to edit some of the core files in Joomla. Im using MVC override plugin:enter link description here

I want to override article.php and articles.php in components/com_content/models.

The override is done and is now working. My problem is that i get this error on my frontpage/homepage.

Fatal error: Cannot redeclare class ContentModelArticles in /Applications/MAMP/htdocs/site/components/com_content/models/articles.php on line 680

Thats the only place i get that error. In articles.php and other places, there are no sign of any similar errors. Can anyone pleas tell me what the solution would be?

Im not sure how to do the override. i just copied the articles.php and put it inside another folder in my templates file. so everything is the same except I added some more fields to my articles.php. It starts like this:

defined('_JEXEC') or die;

use Joomla\Registry\Registry;

/**
 * This models supports retrieving lists of articles.
 *
 * @since  1.6
 */
class ContentModelArticles extends JModelList
{
    /**
     * Constructor.
     *
     * @param   array  $config  An optional associative array of configuration settings.
     *
     * @see     JController
     * @since   1.6
     */
    public function __construct($config = array())
    {
        if (empty($config['filter_fields']))
        {

Im not sure what to do. If I change the ContentModelsArticles to something else.

Answer 1

Overrides do not usually re-declare classes. In most cases, an override is a file loaded instead of the original. Understanding Output Overrides

Given said that, there is an advanced technique to declare a system plugin and load a new class before the original class. Then, Joomla class loader will no load the original class. Overriding a plugin's non-templated layout files?

Answer 2

You've got it right. In: site/templates/mytemplate/code/com_content/models/articles.php

You should have the class created like:

class ContentModelArticles extends ContentModelArticlesDefault

Baiscally the plugin load the "original class" into a string actually creating it through eval(), with Default added to it.