1. *
2.         Cache category ids FOR product breadcrumps;
3.      */
4.     public function cacheCategoryIds(){
5.         $identifier='network_cache_category_ids';
6.         $this->cache = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Framework\App\CacheInterface');
7.         if(!$this->cache->load($identifier)){
8.             $data=$this->getCategoriesToCache();
9.             $tags=array();
10.             $this->cache->save($data, $identifier, $tags, 60*5);
11.         }
12.         return $this->cache->load($identifier);
13.  
14.     }
15.  
16.     public function getCategoriesToCache(){
17.         $connection = \Magento\Framework\App\ObjectManager::getInstance()->get('Magento\Framework\App\ResourceConnection')->getConnection('\Magento\Framework\App\ResourceConnection::DEFAULT_CONNECTION');
18.         $result = $connection->fetchCol("SELECT entity_id FROM m2_catalog_category_entity_text where attribute_id='161' and value!='' and store_id='0'; ");
19.         return $this->getSerializer()->serialize($result);
20.     }
21.  
22.     public function getCategoriesFromCache(){
23.         return $this->getSerializer()->unserialize($this->cacheCategoryIds());
24.     }
25.  
26.     private function getSerializer()
27.     {
28.         if ($this->serializer === null) {
29.             $this->serializer = \Magento\Framework\App\ObjectManager::getInstance()
30.                 ->get('\Magento\Framework\Serialize\Serializer\Json');
31.         }
32.         return $this->serializer;
33.     }
34.    
35.     public function  getParentIds($categoryId = false)
36.     {
37.         $categoryFactory = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Catalog\Model\CategoryFactory');
38.         $categoryHelper = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Catalog\Helper\Category');
39.         $categoryRepository = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Catalog\Model\CategoryRepository');
40.         $category = $categoryFactory->create()->load($categoryId);  
41.         foreach ($category->getParentCategories() as $cat) {
42.            $ids[]=array('id'=> $cat->getId(),
43.                   'name'=> $cat->getName(),
44.                   'url'=> explode('?', $cat->getUrl())[0]);
45.         }
46.         return $ids;  
47.     }
48.  
49.     public function getBreadCrumpsCatIds($current_cats){
50.         $data = array_intersect($current_cats, $this->getCategoriesFromCache());
51.         if(!empty($data)){
52.                 $id = max($data);
53.                 return $this->getParentIds($id);
54.         }
55.         else{
56.                 return array();
57.         }
58.         //return $this->getParentIds($id);
59.         //return array_intersect($current_cats, $this->getCategoriesFromCache())
60.     }
61.  
62.     public function renderBreadCrumps($current_cats){
63.         $i=1;
64.         $script = '<script type="application/ld+json">{
65.                    "@context": "https://schema.org",
66.                    "@type":"BreadcrumbList",
67.                    "itemListElement": [
68.                    {"@type":"ListItem","position":'.$i.',"item":{"@id":"https://bookland.com.pl/","name":"Bookland"}},';                  
69.         foreach ($this->getBreadCrumpsCatIds($current_cats) as $value) {
70.             $i++;
71.             $script .='{"@type":"ListItem","position":'.$i.',"item":{"@id":"'.$value['url'].'","name":"'.$value['name'].'"}},';
72.         }
73.         $script=rtrim($script,',');
74.    $script.=']}</script>';
75.    return $script;
76.     }