Magento2: Products group by filterable attributes

Question

Does anyone know how to get an array with the number of products grouped by attributes that can be filtered, in a controller o helper? For example:

["Activity" => [....], "GENDER" => ["MEN" => 5, "WOMEN" => 5, "UNISEX" => 1] ...]

i am trying to use \Magento\Catalog\Model\Layer\FilterList::getFilters()

but throw

use \Magento\Catalog\Model\Layer\FilterList;


class Magento extends Base {

protected $_filterList;

public function __construct(FilterList $filterList) {

    $this->_filterList = $filterList;

}

Fatal error: Uncaught Error: Cannot instantiate interface Magento\Catalog\Model\Layer\FilterableAttributeListInterface in C:\xampp\apps\magento\htdocs\vendor\magento\framework\ObjectManager\Factory\AbstractFactory.php:93 Stack trace: #0 C:\xampp\apps\magento\htdocs\vendor\magento\framework\ObjectManager\Factory\Compiled.php(88): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject('Magento\Catalog...', Array) #1 C:\xampp\apps\magento\htdocs\vendor\magento\framework\ObjectManager\Factory\Compiled.php(130): Magento\Framework\ObjectManager\Factory\Compiled->create('Magento\Catalog...')

2 C:\xampp\apps\magento\htdocs\vendor\magento\framework\ObjectManager\Factory\Compiled.php(67):

Magento\Framework\ObjectManager\Factory\Compiled->get('Magento\Catalog...')

3 C:\xampp\apps\magento\htdocs\vendor\magento\framework\ObjectManager\Factory\Compiled.php(130):

Magento\Framework\ObjectManager\Factory\Compiled->create('Magento\Catalog...')

4 C:\xampp\apps\magento\htdocs\vendor\magento\framework\ObjectManager\Facto

in C:\xampp\apps\magento\htdocs\vendor\magento\framework\ObjectManager\Factory\AbstractFactory.php on line 93

Answer 1

You can get lsit of filters from \Magento\Catalog\Model\Layer\FilterList::getFilters(). Then you get array of all filters represented by objects extending from \Magento\Catalog\Model\Layer\Filter\AbstractFilter. Than on these objects (Magento\Catalog\Model\Layer\Filter\*) you can call method getItems() which retrieves for you array of objects \Magento\Catalog\Model\Layer\Filter\Item, representing each item option (take a note it may differ according to attribute setting - filterable with/no results). Also methdo getItemsCount() seems to be useful for you. Class FilterList you can add to you controller via DI and then use in execute method. Please not that array of filter don't have as array keys attibute codes of filterable attribute, but you can change it, attribute is available from filter model level.