Update creation of StockItem via API

- If no location is specified, but a default location exists for the part, use that
- If a location is specified (even if it is null) then the specified value is used instead

InvenTree/stock/api.py

@@ -324,8 +324,31 @@ class StockList(generics.ListCreateAPIView):
     serializer_class = StockItemSerializer
     queryset = StockItem.objects.all()
 
-    # TODO - Override the 'create' method for this view,
-    # to allow the user to be recorded when a new StockItem object is created
+    def create(self, request, *args, **kwargs):
+        """
+        Create a new StockItem object via the API.
+
+        We override the default 'create' implementation.
+
+        If a location is *not* specified, but the linked *part* has a default location,
+        we can pre-fill the location automatically.
+        """
+
+        serializer = self.get_serializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+
+        item = serializer.save()
+
+        # A location was *not* specified - try to infer it
+        if 'location' not in request.data:
+            location = item.part.get_default_location()
+            if location is not None:
+                item.location = location
+                item.save()
+
+        # Return a response
+        headers = self.get_success_headers(serializer.data)
+        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
 
     def list(self, request, *args, **kwargs):
         """

InvenTree/stock/test_api.py

@@ -97,6 +97,53 @@ class StockItemTest(StockAPITestCase):
         response = self.client.get(self.list_url, format='json')
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
+    def test_create_default_location(self):
+        """
+        Test the default location functionality,
+        if a 'location' is not specified in the creation request.
+        """
+
+        # The part 'R_4K7_0603' (pk=4) has a default location specified
+
+        response = self.client.post(
+            self.list_url,
+            data={
+                'part': 4,
+                'quantity': 10
+            }
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(response.data['location'], 2)
+
+        # What if we explicitly set the location to a different value?
+
+        response = self.client.post(
+            self.list_url,
+            data={
+                'part': 4,
+                'quantity': 20,
+                'location': 1,
+            }
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(response.data['location'], 1)
+
+        # And finally, what if we set the location explicitly to None?
+
+        response = self.client.post(
+            self.list_url,
+            data={
+                'part': 4,
+                'quantity': 20,
+                'location': '',
+            }
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(response.data['location'], None)
+
     def test_stock_item_create(self):
         """
         Test creation of a StockItem via the API