MAGETWO-64944: Product status is always changing back to "Enabled" after "rest/all/V1/products" REST API call

 - fixes status attribute when saving a product

Author: Robert He

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

@@ -539,6 +539,9 @@ public function save(\Magento\Catalog\Api\Data\ProductInterface $product, $saveO
                 $this->resourceModel->getLinkField(),
                 $existingProduct->getData($this->resourceModel->getLinkField())
             );
+            if (!$product->hasData(Product::STATUS)) {
+                $product->setStatus($existingProduct->getStatus());
+            }
         } catch (NoSuchEntityException $e) {
             $existingProduct = null;
         }

dev/tests/api-functional/testsuite/Magento/Catalog/Api/ProductRepositoryInterfaceTest.php

@@ -1140,4 +1140,34 @@ public function testSpecialPrice()
         $this->assertEquals(0, count(array_intersect($attributeCodes, $missingAttributes)));
         $this->assertEquals(2, count(array_intersect($attributeCodes, $expectedAttribute)));
     }
+
+    public function testUpdateStatus()
+    {
+        // Create simple product
+        $productData = [
+            ProductInterface::SKU => "product_simple_502",
+            ProductInterface::NAME => "Product Simple 502",
+            ProductInterface::VISIBILITY => 4,
+            ProductInterface::TYPE_ID => 'simple',
+            ProductInterface::PRICE => 100,
+            ProductInterface::STATUS => 0,
+            ProductInterface::TYPE_ID => 'simple',
+            ProductInterface::ATTRIBUTE_SET_ID => 4,
+        ];
+
+        // Save product with status disabled
+        $this->saveProduct($productData);
+        $response = $this->getProduct($productData[ProductInterface::SKU]);
+        $this->assertEquals(0, $response['status']);
+
+        // Update the product
+        $productData[ProductInterface::PRICE] = 200;
+        $this->saveProduct($productData);
+        $response = $this->getProduct($productData[ProductInterface::SKU]);
+
+        // Status should still be disabled
+        $this->assertEquals(0, $response['status']);
+        // Price should be updated
+        $this->assertEquals(200, $response['price']);
+    }
 }