Fatal error: Uncaught Error: Call to a member function addAttributeToSort() on null in /app/code/Sm/FilterProducts/Block/FilterProducts.php:394 Stack trace: #0 /app/code/Sm/FilterProducts/Block/FilterProducts.php(193): Sm\FilterProducts\Block\FilterProducts->_newProducts() #1 /app/code/Sm/FilterProducts/Block/FilterProducts.php(442): Sm\FilterProducts\Block\FilterProducts->_getProducts() #2 /generated/code/Sm/FilterProducts/Block/FilterProducts/Interceptor.php(102): Sm\FilterProducts\Block\FilterProducts->getLoadedProductCollection() #3 /app/design/frontend/Sm/market/Sm_FilterProducts/templates/default-sidebar.phtml(15): Sm\FilterProducts\Block\FilterProducts\Interceptor->getLoadedProductCollection() #4 /vendor/magento/framework/View/TemplateEngine/Php.php(59): include('/home/www/onlyt…') #5 /vendor/ in /app/code/Sm/FilterProducts/Block/FilterProducts.php on line 394
my collection code as :
$collection->addMinimalPrice()
->addFinalPrice()
->addTaxPercents()
->addAttributeToSelect($this->_catalogConfig->getProductAttributes())
->addUrlRewrite()
->setStoreId($this->_storeId)
->addAttributeToFilter('is_saleable', [1], 'left')
->addAttributeToSort('created_at','DESC');
Best Answer
It is a bug in magento. The method "addAttributeToFilter" does not return the object if you are using method chaining. This bug is fixed in the 2.3-develop branch.
As workaround you can call the collection like this: