Ttdfjt

Simply I want to get the rule_id or catalog rule details that is applied to a product in product details page and product listing page.

I have checked with this function _getRulesFromProduct() from magento-catalog-rule/Model/Rule.php but it return all catalog rule applicable for that product.

I want only one rule which is currently applied to that product.

Try with below way!

public function getCatalogPriceRuleProductIds()

 $storeManager = MagentoFrameworkAppObjectManager::getInstance()->create(
 'MagentoStoreModelStoreManagerInterface'
 );
 $catalogRule = MagentoFrameworkAppObjectManager::getInstance()->create(
 'MagentoCatalogRuleModelRuleFactory'
 );

 $websiteId = $storeManager->getStore()->getWebsiteId();//current Website Id

 $resultProductIds = [];
 $catalogRuleCollection = $catalogRule->create()->getCollection();
 $catalogRuleCollection->addIsActiveFilter(1);//filter for active rules only
 foreach ($catalogRuleCollection as $catalogRule) 
 $productIdsAccToRule = $catalogRule->getMatchingProductIds();
 if (in_array("Your currrent productId", $affectedProductIds)) 
 //product has a price rule set for it
 
 
 return $resultProductIds;

Please don't use objectmanager. it's bad practice! I hope it helps!

Try getting rules from the resourceModel instead, I have used objectmanager try to use it as dependency,

public function get($product) 
 $priceRules = null; 
 $price = $product->getPriceInfo()->getPrice('regular_price')->getAmount()->getValue(); 
 $storeId = $product->getStoreId(); 
 $dateTs = $this->_localeDate->scopeTimeStamp($storeId); 
 $websiteId = $this->_storeManager->getStore($storeId)->getWebsiteId(); 

 if ($product->hasCustomerGroupId()) 
 $customerGroupId = $product->getCustomerGroupId(); 
 else 
 $customerGroupId = $this->_customerSession->getCustomerGroupId(); 
 

 $resource = $this->_objectManager->create('MagentoCatalogRuleModelResourceModelRule');

 $rules = $resource->getRulesFromProduct($dateTs, $websiteId, $customerGroupId, $product->getId());

 print_r( $rules); 
 

Let me know if you have any queries