Display only Subcategories if i call particular category

Question

I am displaying all Custom Categories & its sub-categories in Json format with help of below code....

Note : These Categories & its sub-categories are created using custom module

<?php

require_once('app/Mage.php');
Mage::app();

$cat_model = Mage::getModel('ultimate_mars/category');
$_categories = $cat_model->getTreeModel()->getCollection()->addFieldToFilter("entity_id", array('gt' => 1));

$category = array();
foreach($_categories as $_category)
{
    $category[] = array("name" => $_category->getCategoryname(), "id" => $_category->getEntityId());
}

echo json_encode($category);

Result :

What i need :

If i pass particular category id [say Tshirts id] in Url, than i need to display only its sub-categories [ say Men & Women ] in JSON format....

app/code/local/Ultimate/Mars/Model - Category.php

<?php

    class Ultimate_Mars_Model_Category extends Mage_Core_Model_Abstract
    {

        const ENTITY    = 'ultimate_mars_category';
        const CACHE_TAG = 'ultimate_mars_category';

        protected $_eventPrefix = 'ultimate_mars_category';

        protected $_eventObject = 'category';

        public function _construct()
        {
            parent::_construct();
            $this->_init('ultimate_mars/category');
        }

        public function getSelectedProductsCollection()
        {
            if (!$this->hasData('_product_collection')) {
                if (!$this->getId()) {
                    return new Varien_Data_Collection();
                } else {
                    $collection = Mage::getResourceModel('ultimate_mars/product_collection')
                            ->addFieldToFilter('category_id', $this->getId());
                    $this->setData('_product_collection', $collection);
                }
            }
            return $this->getData('_product_collection');
        }

        public function getTreeModel()
        {
            return Mage::getResourceModel('ultimate_mars/category_tree');
        }

        public function getTreeModelInstance()
        {
            if (is_null($this->_treeModel)) {
                $this->_treeModel = Mage::getResourceSingleton('ultimate_mars/category_tree');
            }
            return $this->_treeModel;
        }

        public function getParentCategory()
        {
            if (!$this->hasData('parent_category')) {
                $this->setData(
                    'parent_category',
                    Mage::getModel('ultimate_mars/category')->load($this->getParentId())
                );
            }
            return $this->_getData('parent_category');
        }

        public function getParentId()
        {
            $parentIds = $this->getParentIds();
            return intval(array_pop($parentIds));
        }


        public function getParentIds()
        {
            return array_diff($this->getPathIds(), array($this->getId()));
        }


        public function getAllChildren($asArray = false)
        {
            $children = $this->getResource()->getAllChildren($this);
            if ($asArray) {
                return $children;
            } else {
                return implode(',', $children);
            }
        }

        public function getChildCategorys()
        {
            return implode(',', $this->getResource()->getChildren($this, false));
        }


        public function checkId($id)
        {
            return $this->_getResource()->checkId($id);
        }


        public function getPathIds()
        {
            $ids = $this->getData('path_ids');
            if (is_null($ids)) {
                $ids = explode('/', $this->getPath());
                $this->setData('path_ids', $ids);
            }
            return $ids;
        }

        public function getLevel()
        {
            if (!$this->hasLevel()) {
                return count(explode('/', $this->getPath())) - 1;
            }
            return $this->getData('level');
        }


        public function verifyIds(array $ids)
        {
            return $this->getResource()->verifyIds($ids);
        }

        public function hasChildren()
        {
            return $this->_getResource()->getChildrenAmount($this) > 0;
        }

        public function getCategorys($parent, $recursionLevel = 0, $sorted=false, $asCollection=false, $toLoad=true)
        {
            return $this->getResource()->getCategorys($parent, $recursionLevel, $sorted, $asCollection, $toLoad);
        }


        public function getParentCategorys()
        {
            return $this->getResource()->getParentCategorys($this);
        }


        public function getChildrenCategorys()
        {
            return $this->getResource()->getChildrenCategorys($this);
        }


        public function getStatusPath()
        {
            $parents = $this->getParentCategorys();
            $rootId = Mage::helper('ultimate_mars/category')->getRootCategoryId();
            foreach ($parents as $parent) {
                if ($parent->getId() == $rootId) {
                    continue;
                }
                if (!$parent->getStatus()) {
                    return false;
                }
            }
            return $this->getStatus();
        }        
    }

Here is link to Download module : link

Answer 1

use below code to get sub category of category tshirt

<?php

error_reporting(E_ALL);
ini_set('display_errors', 1);

require_once('app/Mage.php');
Mage::app();


$cat_model = Mage::getModel('ultimate_mars/category');
$reqCat = (int)$_REQUEST['category_id'];
if ($reqCat > 0) {



    $_cate = $cat_model->getTreeModel()->getCollection()->addFilter("parent_id", $reqCat);



} else {
    $_cate = $cat_model->getTreeModel()->getCollection()->addFieldToFilter("entity_id", array('gt' => 1));
}


$category = array();
foreach ($_cate as $_category) {
    $category[] = array("name" => $_category->getCategoryname(), "id" => $_category->getEntityId());
}

echo json_encode($category);

Answer 2

$parentCatId = 1;// pass your required category id here

$category = Mage::getModel('catalog/category')
        load($parentCatId)
        ;


$subcats = $category->getChildren();


 $subcat=array();
foreach(explode(',',$subcats) as $subCatid)
{
  $_category = Mage::getModel('catalog/category')->load($subCatid);
  if($_category->getIsActive())
  {
     $image = $_category->getImageUrl();

    $subcat[]=array(
           "id"=>$_category->getId(), 
           "url"=>($_category->getURL())  ? $_category->getURL() : "", 
            "name"=>($_category->getName())  ? $_category->getName() : "",
            "meta_title"=>($_category->getMetaTitle())  ? $_category->getMetaTitle(): "", 
            "meta_keywords"=>($_category->getMetaKeywords())  ? $_category->getMetaKeywords(): "",
            "meta_description"=>($_category->getMetaDescription())  ? $_category->getMetaDescription(): "",
            "image_url"=>($image)  ? $image: "",
    );

  }

Answer 3

Can you replace below code

$_categories = $cat_model->getTreeModel()->getCollection()->addFieldToFilter("entity_id", array('gt' => 1));

with

$_categories = $cat_model->getTreeModel()->getCollection()->addFieldToFilter("entity_id", array('eq' => 2));

I have not checked this but it should help you.

Answer 4

Try this code working fine for me

<?php require_once('app/Mage.php');
Mage::app();

$categryId = 2; /* Your requested category ID */ 
$yourCategory = Mage::getModel('ultimate_mars/category')->load($categryId);

$childLevel = (int)$yourCategory->getData("categorylevel") + 1;
/* Getting subcategory of requested category id */
$cat_model = Mage::getModel('ultimate_mars/category');
$_categories = $cat_model->getTreeModel()->getCollection()->addFieldToFilter("parent_id",$yourCategory->getId())->addFieldToFilter("categorylevel",$childLevel);

$category = array();
foreach($_categories as $_category)
{
    $category[] = array("name" => $_category->getCategoryname(), "id" => $_category->getEntityId());
}

echo json_encode($category);