MAGETWO-44573: API model load does not trigger corresponding events in Sales Module

Author: akaplya

app/code/Magento/Sales/Model/Order/AddressRepository.php

@@ -60,10 +60,7 @@ public function get($id)
 
         if (!isset($this->registry[$id])) {
             /** @var \Magento\Sales\Api\Data\OrderAddressInterface $entity */
-            $entity = $this->metadata->getNewInstance();
-
-            $this->metadata->getMapper()->load($entity, $id);
-
+            $entity = $this->metadata->getNewInstance()->load($id);
             if (!$entity->getEntityId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

app/code/Magento/Sales/Model/Order/CreditmemoRepository.php

@@ -64,8 +64,7 @@ public function get($id)
         }
         if (!isset($this->registry[$id])) {
             /** @var \Magento\Sales\Api\Data\CreditmemoInterface $entity */
-            $entity = $this->metadata->getNewInstance();
-            $this->metadata->getMapper()->load($entity, $id);
+            $entity = $this->metadata->getNewInstance()->load($id);
             if (!$entity->getEntityId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

app/code/Magento/Sales/Model/Order/InvoiceRepository.php

@@ -62,8 +62,7 @@ public function get($id)
         }
         if (!isset($this->registry[$id])) {
             /** @var \Magento\Sales\Api\Data\InvoiceInterface $entity */
-            $entity = $this->metadata->getNewInstance();
-            $this->metadata->getMapper()->load($entity, $id);
+            $entity = $this->metadata->getNewInstance()->load($id);
             if (!$entity->getEntityId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

app/code/Magento/Sales/Model/Order/ItemRepository.php

@@ -99,8 +99,7 @@ public function get($id)
         }
         if (!isset($this->registry[$id])) {
             /** @var OrderItemInterface $orderItem */
-            $orderItem = $this->metadata->getNewInstance();
-            $this->metadata->getMapper()->load($orderItem, $id);
+            $orderItem = $this->metadata->getNewInstance()->load($id);
             if (!$orderItem->getItemId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

app/code/Magento/Sales/Model/Order/Payment/Repository.php

@@ -79,8 +79,7 @@ public function get($id)
             throw new \Magento\Framework\Exception\InputException(__('ID required'));
         }
         if (!isset($this->registry[$id])) {
-            $entity = $this->metaData->getNewInstance();
-            $this->metaData->getMapper()->load($entity, $id);
+            $entity = $this->metaData->getNewInstance()->load($id);
             if (!$entity->getId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

app/code/Magento/Sales/Model/Order/Payment/Transaction/Repository.php

@@ -95,9 +95,7 @@ public function get($id)
             throw new \Magento\Framework\Exception\InputException(__('ID required'));
         }
         if (!$this->entityStorage->has($id)) {
-            $entity = $this->metaData->getNewInstance();
-            /** @var \Magento\Sales\Api\Data\TransactionInterface $entity */
-            $this->metaData->getMapper()->load($entity, $id);
+            $entity = $this->metaData->getNewInstance()->load($id);
             if (!$entity->getTransactionId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

app/code/Magento/Sales/Model/Order/ShipmentRepository.php

@@ -60,10 +60,7 @@ public function get($id)
 
         if (!isset($this->registry[$id])) {
             /** @var \Magento\Sales\Api\Data\ShipmentInterface $entity */
-            $entity = $this->metadata->getNewInstance();
-
-            $this->metadata->getMapper()->load($entity, $id);
-
+            $entity = $this->metadata->getNewInstance()->load($id);
             if (!$entity->getEntityId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

app/code/Magento/Sales/Model/OrderRepository.php

@@ -60,8 +60,7 @@ public function get($id)
         }
         if (!isset($this->registry[$id])) {
             /** @var \Magento\Sales\Api\Data\OrderInterface $entity */
-            $entity = $this->metadata->getNewInstance();
-            $this->metadata->getMapper()->load($entity, $id);
+            $entity = $this->metadata->getNewInstance()->load($id);
             if (!$entity->getEntityId()) {
                 throw new NoSuchEntityException(__('Requested entity doesn\'t exist'));
             }

lib/internal/Magento/Framework/ObjectManager/Code/Generator/Persistor.php

@@ -249,8 +249,7 @@ protected function _getGetConnectionMethod()
      */
     protected function _getLoadEntityMethod()
     {
-        $body = "\$entity = \$this->{$this->_getSourceFactoryPropertyName()}->create();\n"
-            . "\$this->{$this->_getSourceResourcePropertyName()}->load(\$entity, \$key);\n"
+        $body = "\$entity = \$this->{$this->_getSourceFactoryPropertyName()}->create()->load(\$key);\n"
             . "return \$entity;";
         return [
             'name' => 'loadEntity',