Adds framework for API endpoint and serializer to merge stock items

InvenTree/stock/api.py

@@ -180,6 +180,20 @@ class StockAssign(generics.CreateAPIView):
         return ctx
 
 
+class StockMerge(generics.CreateAPIView):
+    """
+    API endpoint for merging multiple stock items
+    """
+
+    queryset = StockItem.objects.none()
+    serializer_class = StockSerializers.StockMergeSerializer
+
+    def get_serializer_context(self):
+        ctx = super().get_serializer_context()
+        ctx['request'] = self.request
+        return ctx
+
+
 class StockLocationList(generics.ListCreateAPIView):
     """
     API endpoint for list view of StockLocation objects:
@@ -1213,6 +1227,7 @@ stock_api_urls = [
     url(r'^remove/', StockRemove.as_view(), name='api-stock-remove'),
     url(r'^transfer/', StockTransfer.as_view(), name='api-stock-transfer'),
     url(r'^assign/', StockAssign.as_view(), name='api-stock-assign'),
+    url(r'^merge/', StockMerge.as_view(), name='api-stock-merge'),
 
     # StockItemAttachment API endpoints
     url(r'^attachment/', include([