[1.6.x] Module Controller - Listhelper Filter Not Working

[Casper_O]

I Have been trying to make a controller with listHelper to show and filter some custom table and finally i figured out how to get the sorting to work correctly, but filtering just dont want to play with me.

 

this is the top of my code so far, where i generate the listing:
 

class AdminBogportalenPricerulesController extends ModuleAdminController {

	public $available_fields;

	public function __construct()
	{
		
		$manufacturers = Manufacturer::getManufacturers(false, 0, true, false, false, false, true);
		foreach ($manufacturers as $manufacturer)
		{
			$manufacturers_list[$manufacturer['id_manufacturer']] = $manufacturer['name'];
		}
		
		$suppliers = Supplier::getSuppliers();
		foreach ($suppliers as $supplier)
		{
			$suppliers_list[(int)$supplier['id_supplier']] = $supplier['name'];
		}
		
		$this->bootstrap = true;
		$this->module = 'bogportalen';
		$this->className = 'BogportalenPricerules';
		$this->table = 'bogportalen_pricerules';
		$this->meta_title = $this->l('Bogportalen pricerules');
		$this->identifier = 'id_pricerule';
		$this->context = Context::getContext();
		parent::__construct();
		$this->fields_list = array(
			'id_pricerule' => array(
				'title' => $this->l('ID'),
				'align' => 'text-center',
				'class' => 'fixed-width-xs',
			),
			'isbn' => array(
				'title' => $this->l('isbn'),
			),
			'discountcategory' => array(
				'title' => $this->l('Discount category'),
				'filter_key' => 'a!discountcategory',
			),
			'distributor_name' => array(
				'title' => $this->l('Distributor'),
				'type' => 'select',
				'list' => $suppliers_list,
				'filter_key' => 's!id_supplier',
                'order_key' => 'distributor_name'
				//'filter_key' => 's\!id_supplier',
			),
			'publisher_name' => array(
				'title' => $this->l('Publisher'),
				'type' => 'select',
				'list' => $manufacturers_list,
				'filter_key' => 'm!id_manufacturer',
			),
			'adjustment' => array(
				'title' => $this->l('Adjustment'),
				'filter_key' => 'a!adjustment',
			),
			'rounding' => array(
				'title' => $this->l('Rounding'),
			),
			'status' => array(
				'title' => $this->l('status'),
				'active' => 'status',
				'type' => 'bool',
				'class' => 'fixed-width-xs',
				'align' => 'center',
				'filterBy' => false,
				'search' => false,
			),
		);
		
		
		$this->_select = '
				s.name as distributor_name,
				m.name as publisher_name';
				
		$this->_join = '
				LEFT JOIN '._DB_PREFIX_.'supplier s ON s.id_supplier = a.distributor
				LEFT JOIN '._DB_PREFIX_.'manufacturer m ON m.id_manufacturer = a.publisher';
				
		$this->_defaultOrderBy = 'id_pricerule';
		$this->_defaultOrderWay = 'ASC';
		
		parent::__construct();
		if (! $this->module->active)
			Tools::redirectAdmin($this->context->link->getAdminLink('AdminHome'));

	}

If i click one of the filters, the page reloads, the filter value fields are blank and i still see all entries.

 

Also i noticed that in SmartBlog module on Comment overview, if you filter they have a variable in the URL named: submitFiltersmart_blog_comment=1

I dont have this variable in my URL.

 

I have been reading the documentation for listHelper for days, but there is nothing helpfuld regarding filters