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8.4.2: How to render vew() with variables from other actions in DashboardPageController?

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I have an item list which I want to filter by either a group or a category or by both a group and a category. The filter actions in a DashboardPageController are:
protected $group_id = null;
protected $category_id = null;
public function view()
{
    \Log::Info($this->group_id);
}
public function filter_group($id = 0)
{
    if ($id > 0) {
        $this->group_id = $id;
        $this->runAction('view');
    }
    else {
        $this->group_id = null;
        $this->runAction('view');
Viewing 15 lines of 28 lines. View entire code block.

If I filter the group, I get the group_id in view(). But the problem is when I filter the category and do the view action, it refreshes the page and the group_id value is lost.

In a block controller I can do
$this->view($group_id, $category_id);
...
public function view($group_id, $category_id)

But this doesn't work in a page controller.

One way would be to use sessions. Is this the only way? Or is there another way to pass variables to the view in a page controller?
linuxoid