Magento 2: Get parent category, children categories & product count

This article shows how we can get parent category, children categories and total number of products in a category in Magento 2.

Below is a block class of my custom module (Chapagain_HelloWorld). I have injected object of \Magento\Catalog\Model\CategoryFactory class in the constructor of my module’s block class.

Objects of class \Magento\Catalog\Helper\Category and \Magento\Catalog\Model\CategoryRepository as also used in the constructor. They will be used to print a nested list of categories and sub-categories.

app/code/Chapagain/HelloWorld/Block/HelloWorld.php


<?php
namespace Chapagain\HelloWorld\Block;
class HelloWorld extends \Magento\Framework\View\Element\Template
{    
    protected $_categoryFactory;
    protected $_category;
    protected $_categoryHelper;
    protected $_categoryRepository;
        
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,        
        \Magento\Catalog\Model\CategoryFactory $categoryFactory,
        \Magento\Catalog\Helper\Category $categoryHelper,
        \Magento\Catalog\Model\CategoryRepository $categoryRepository,        
        array $data = []
    )
    {
        $this->_categoryFactory = $categoryFactory;        
        parent::__construct($context, $data);
    }
    
    /**
     * Get category object
     * Using $_categoryFactory
     *
     * @return \Magento\Catalog\Model\Category
     */
    public function getCategory($categoryId) 
    {
        $this->_category = $this->_categoryFactory->create();
        $this->_category->load($categoryId);        
        return $this->_category;
    }
 
	/**
     * Get category object
     * Using $_categoryRepository
     *
     * @return \Magento\Catalog\Model\Category
     */
    public function getCategoryById($categoryId) 
    {
        return $this->_categoryRepository->get($categoryId);
    }
 
    /**
     * Retrieve current store categories
     *
     * @param bool|string $sorted
     * @param bool $asCollection
     * @param bool $toLoad
     * @return \Magento\Framework\Data\Tree\Node\Collection or
     * \Magento\Catalog\Model\ResourceModel\Category\Collection or array
     */
    public function getStoreCategories($sorted = false, $asCollection = false, $toLoad = true) 
    {
        return $this->_categoryHelper->getStoreCategories();
    }
    
    /**
     * Get parent category object
     *
     * @return \Magento\Catalog\Model\Category
     */
    public function getParentCategory($categoryId = false)
    {
        if ($this->_category) {
            return $this->_category->getParentCategory();
        } else {
            return $this->getCategory($categoryId)->getParentCategory();        
        }        
    }
    
    /**
     * Get parent category identifier
     *
     * @return int
     */
    public function getParentId($categoryId = false)
    {
        if ($this->_category) {
            return $this->_category->getParentId();
        } else {
            return $this->getCategory($categoryId)->getParentId();
        }
    }
    
    /**
     * Get all parent categories ids
     *
     * @return array
     */
    public function getParentIds($categoryId = false)
    {
        if ($this->_category) {
            return $this->_category->getParentIds();
        } else {
            return $this->getCategory($categoryId)->getParentIds();
        }        
    }
    
    /**
     * Get all children categories IDs
     *
     * @param boolean $asArray return result as array instead of comma-separated list of IDs
     * @return array|string
     */
    public function getAllChildren($asArray = false, $categoryId = false)
    {
        if ($this->_category) {
            return $this->_category->getAllChildren($asArray);
        } else {
            return $this->getCategory($categoryId)->getAllChildren($asArray);
        }
    }
 
    /**
     * Retrieve children ids comma separated
     *
     * @return string
     */
    public function getChildren($categoryId = false)
    {
        if ($this->_category) {
            return $this->_category->getChildren();
        } else {
            return $this->getCategory($categoryId)->getChildren();
        }        
    }    
}
?>

Now, we fetch and print the category, parent category, children categories and product count in template file.


$categoryId = 23; // fetching products in category id 23

// Load category by category ID
$category = $block->getCategory($categoryId);

// Get Category Level
echo $category->getLevel() . '<br />';

// Get total products associated with the category
echo $category->getProductCount() . '<br />';

// Get array parent categories of loaded category
$parentCategories = $category->getParentCategories();

// Get array of child categories of loaded category
$childrenCategories = $category->getChildrenCategories();

// Get single parent category object
$block->getParentCategory();

// Get only the category id of single parent category
$block->getParentId();

// Get array of all parent category ids
$block->getParentIds();

// Get comma-separated children categories ids
$block->getChildren();

// Get comma-separated or array of all childrent categories ids
$block->getAllChildren(); // as comma-separated
$block->getAllChildren(true); // as an array

// Get nested list of categories and sub-categories along with their product count
$categories = $block->getStoreCategories();
foreach ($categories as $category) {
    echo $category->getName();
    echo ' ( ' . $category->getProductCount() . ' )';

    $subCategories = $block->getCategoryById($category->getId());
    foreach ($subCategories as $subCategory) {
        echo $subCategory->getName();
        echo ' ( ' . $subCategory->getProductCount() . ' )';
    }
}

Using Object Manager


$objectManager =  \Magento\Framework\App\ObjectManager::getInstance();		

$appState = $objectManager->get('\Magento\Framework\App\State');
$appState->setAreaCode('frontend');

$categoryFactory = $objectManager->get('\Magento\Catalog\Model\CategoryFactory');
$categoryHelper = $objectManager->get('\Magento\Catalog\Helper\Category');
$categoryRepository = $objectManager->get('\Magento\Catalog\Model\CategoryRepository');

$categoryId = 21; // YOUR CATEGORY ID
$category = $categoryFactory->create()->load($categoryId);

//var_dump($category->getData());

$parentCategories = $category->getParentCategories();
$childrenCategories = $category->getChildrenCategories();

$storeCategories = $categoryHelper->getStoreCategories();

Hope this helps. Thanks.