@Sylwia, What are you trying to achieve?
You can always just call ->count(); on the query to know exactly how many results there are.
Take a look at the docs for the listExtendQuery function. You could always set a variable you could use in the index function.
The controller class is just a php class. You can easily count the results in the query and save it to a variable in the controller. Let’s say
$this->countRecords = $query->count().
Then just use the
$this->countRecords variable in the index method.
Take a look at this file: /modules/backend/widgets/Lists.php. There should be a $records variable available so I think you can do the following:
$recordsCount = $this->vars[‘records’]->count();
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