Experimenting with Magento EE 2.1.7. I've created a module which has the means to filter a collection but apparently I'm doing something wrong because I get an "Illegal State" error on the frontend category pages when I include this line prior to return $collection;


While the below code will yield the desired result(s) in the category listing/grid, it fails to reflect the total number of results in pagination or the category product count in toolbar (i.e. There might be a single product on page but 600 products listed in the count and multiple pages of pagination).


// File: app/code/MyCompany/MyModule/Block/Category/Form.php

namespace MyCompany\MyModule\Block\Category;

class Form extends \Magento\Framework\View\Element\Template
    protected $_catalogLayer;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Catalog\Model\Layer\Resolver $layerResolver,
        array $data = []
    ) {
        $this->_catalogLayer = $layerResolver->get();
        parent::__construct($context, $data);

    protected function _prepareLayout()

        $collection = $this->_catalogLayer->getProductCollection();

        $collection->addAttributeToFilter('sku', '123456');

        // This line results in "Illegal state" error on category page.

        return $collection;
  • why are you using $collection->getSize(); as this will return you the total no of records and you are not even using it ?
    – Priyank
    Sep 1, 2017 at 13:29
  • I was just attempting to get it to work as it seemed be a pre-req for accurate pagination (requires counting of products divided by number to show in grid). I never got beyond including it in the code and having it error out.
    – sparecycle
    Sep 1, 2017 at 16:21

1 Answer 1

protected $_productCollectionFactory;

public function __construct(
\Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $productCollectionFactory,
) {
$this->_productCollectionFactory = $productCollectionFactory;

Pass this class inside your __construct() method, and then:

$collection = $this->_productCollectionFactory->create();
$collection->addAttributeToFilter('sku', array('eq' => '123456'));
$size = $collection->getSize();
return $size;

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