MAGETWO-49956: Store Selector for Product Page

- Implemented workaround for product validation issue on custom store view;

Author: Alex Akimov

app/code/Magento/Catalog/Model/Attribute/ScopeOverriddenValue.php

@@ -140,7 +140,7 @@ private function initAttributeValues($entityType, $entity, $storeId)
                         'a.attribute_id = t.attribute_id',
                         ['attribute_code' => 'a.attribute_code']
                     )
-                    ->where($metadata->getLinkField() . ' = ?', $entity->getId())
+                    ->where($metadata->getLinkField() . ' = ?', $entity->getData($metadata->getLinkField()))
                     ->where('t.attribute_id IN (?)', $attributeCodes)
                     ->where('t.store_id IN (?)', $storeIds);
                 $selects[] = $select;

app/code/Magento/Catalog/Model/ProductRepository.php

@@ -498,12 +498,16 @@ public function save(\Magento\Catalog\Api\Data\ProductInterface $product, $saveO
             $product->setCanSaveCustomOptions(true);
         }
 
-        $validationResult = $this->resourceModel->validate($product);
-        if (true !== $validationResult) {
-            throw new \Magento\Framework\Exception\CouldNotSaveException(
-                __('Invalid product data: %1', implode(',', $validationResult))
-            );
+        $useValidation = \Magento\Store\Model\Store::ADMIN_CODE === $this->storeManager->getStore()->getCode();
+        if ($useValidation) {
+            $validationResult = $this->resourceModel->validate($product);
+            if (true !== $validationResult) {
+                throw new \Magento\Framework\Exception\CouldNotSaveException(
+                    __('Invalid product data: %1', implode(',', $validationResult))
+                );
+            }
         }
+
         try {
             if ($tierPrices !== null) {
                 $product->setData('tier_price', $tierPrices);