详情页Related Products修改推荐大分类商品

app/code/Magento/Catalog/Block/Product/ProductList/Related.php

@@ -100,28 +100,14 @@ class Related extends AbstractProduct implements IdentityInterface
         $product = $this->getProduct();
         /* @var $product Product */
         
-        $this->_itemCollection = $product->getRelatedProductCollection()->addAttributeToSelect(
-            'required_options'
-        )->setPositionOrder()->addStoreFilter();
-
-        if ($this->moduleManager->isEnabled('Magento_Checkout')) {
-            $this->_addProductAttributesAndPrices($this->_itemCollection);
-        }
+        $this->_itemCollection = $this->_collectionFactory->create();
+        $this->_itemCollection->addAttributeToSelect('*');
+        //$this->_itemCollection->addCategoriesFilter(['in' => $product->getCategoryIds()]);
         $this->_itemCollection->setVisibility($this->_catalogProductVisibility->getVisibleInCatalogIds());
-
-        $this->_itemCollection->load();
-
-        if (!count($this->_itemCollection->getItems())){
-            $collection = $this->_collectionFactory->create();
-            $collection->addAttributeToSelect('*');
-            $collection->addCategoriesFilter(['in' => $product->getCategoryIds()]);
-            $collection->setVisibility($this->_catalogProductVisibility->getVisibleInCatalogIds());
-            $collection->getSelect()->order('rand()');
-            $collection->setPageSize(10);
-            $collection->addStoreFilter($product->getStoreId());
-            $this->_itemCollection =  $collection;
-        }
-
+        $this->_itemCollection->getSelect()->order('rand()');
+        $this->_itemCollection->setPageSize(10);
+        $this->_itemCollection->addStoreFilter($product->getStoreId());
+        $this->_itemCollection->getSelect()->limit(10);
         foreach ($this->_itemCollection as $product) {
             $product->setDoNotUseCategoryId(true);
         }