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Removed and backward incompatibility

Developer Note

Since this version of Joomla has not been released yet, this page can change anytime.

All the deprecated features than have now been removed and any backward incompatibilities. There should be an explanation of how to mitigate the removals / changes.

CMS Input object switched to Framework Input object​

  • PR's:
  • Description: The CMS Input namespace \Joomla\CMS\Input has been removed. The CMS core code has switched the code to the Framework Input library with the namespace \Joomla\Input, which is very much a drop-in replacement. This is especially of relevance if you are using the MVC classes, which now use the framework class. Make sure that your code imports the correct class.

CMS BaseApplication and CLI classes have been removed​

  • PR: https://github.com/joomla/joomla-cms/pull/42884
  • Description: The class \Joomla\CMS\Application\BaseApplication and \Joomla\CMS\Application\CliApplication respective CLI input classes have been removed. The CMS core code has been switched to use the Application package of the Joomla Framework. Any reference to these classes should be replaced with the namespace \Joomla\Application. Cli apps should be replaced by console plugins.

UTC is used instead of GMT​

Removed legacy b/c code in \Joomla\CMS\Date\Date Class​

View classes do not have a database reference​

  • PR: https://github.com/joomla/joomla-cms/pull/42962
  • Description: In Joomla 3 some views had a reference to the global database instance to check if a date is a special null date (0000-00-00 00:00:00). Since Joomla 4 all these dates are real null values and the database check is not used anymore. If there are some old template overrides in place with these checks, they can be removed.
// Old:
if ($this->item->created !== $this->db->getNullDate()) {
	echo $this->item->created;
}

// New:
if ($this->item->created !== null) {
	echo $this->item->created;
}

getItem returns a stdClass instead of CMSObject​

  • PR: https://github.com/joomla/joomla-cms/pull/42961
  • File: libraries/src/MVC/Model/AdminModel.php
  • Description: The AdminModel class does return a stdClass object in the getItem function instead of a CMSObject. This means that all the deprecated functions of CMSObject are not available anymore. Mainly the set and get function should be replaced accordingly as documented in the CMSObject class or the respective traits. For example you can use
// Old:
$article = $app->bootComponent('content')->getMVCFactory()->createModel('Article', 'Administrator')->getItem(1);
echo $article->get('title');

// New:
$article = $app->bootComponent('content')->getMVCFactory()->createModel('Article', 'Administrator')->getItem(1);
echo $article->title;