Add a custom OrderingFilter class

Needs further work

InvenTree/InvenTree/filters.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from rest_framework.filters import OrderingFilter
+
+
+class InvenTreeOrderingFilter(OrderingFilter):
+    """
+    Custom OrderingFilter class which allows aliased filtering of related fields.
+
+    To use, simply specify this filter in the "filter_backends" section.
+
+    Then, you can specify aliasing for ordering fields (or use ordering_fields as normal), e.g.
+
+    filter_backends = [
+        InvenTreeOrderingFilter,
+    ]
+
+    ordering_fields = [
+        'name',
+        'quantity',
+        ('part__SKU', 'SKU')
+    ]
+
+    Here, ordering by "SKU" will actually order by the "SKU" field on the related part field
+
+    """
+
+    def get_ordering(self, request, queryset, view):
+
+        ordering = super().get_ordering(request, queryset, view)
+
+        print("ORDERING:", ordering)
+        return ordering

InvenTree/order/api.py

@@ -7,11 +7,12 @@ from __future__ import unicode_literals
 
 from django.conf.urls import url, include
 
-from django_filters.rest_framework import DjangoFilterBackend
+from django_filters import rest_framework as rest_filters
 from rest_framework import generics
 from rest_framework import filters, status
 from rest_framework.response import Response
 
+from InvenTree.filters import InvenTreeOrderingFilter
 from InvenTree.helpers import str2bool
 from InvenTree.api import AttachmentMixin
 from InvenTree.status_codes import PurchaseOrderStatus, SalesOrderStatus
@@ -144,7 +145,7 @@ class POList(generics.ListCreateAPIView):
         return queryset
 
     filter_backends = [
-        DjangoFilterBackend,
+        rest_filters.DjangoFilterBackend,
         filters.SearchFilter,
         filters.OrderingFilter,
     ]
@@ -226,9 +227,9 @@ class POLineItemList(generics.ListCreateAPIView):
         return self.serializer_class(*args, **kwargs)
 
     filter_backends = [
-        DjangoFilterBackend,
+        rest_filters.DjangoFilterBackend,
         filters.SearchFilter,
-        filters.OrderingFilter
+        InvenTreeOrderingFilter
     ]
 
     ordering_fields = [
@@ -272,7 +273,7 @@ class SOAttachmentList(generics.ListCreateAPIView, AttachmentMixin):
     serializer_class = SOAttachmentSerializer
 
     filter_backends = [
-        DjangoFilterBackend,
+        rest_filters.DjangoFilterBackend,
     ]
 
     filter_fields = [
@@ -396,7 +397,7 @@ class SOList(generics.ListCreateAPIView):
         return queryset
 
     filter_backends = [
-        DjangoFilterBackend,
+        rest_filters.DjangoFilterBackend,
         filters.SearchFilter,
         filters.OrderingFilter,
     ]
@@ -495,7 +496,7 @@ class SOLineItemList(generics.ListCreateAPIView):
         return queryset
 
     filter_backends = [
-        DjangoFilterBackend,
+        rest_filters.DjangoFilterBackend,
         filters.SearchFilter,
         filters.OrderingFilter
     ]
@@ -580,7 +581,7 @@ class SOAllocationList(generics.ListCreateAPIView):
         return queryset
 
     filter_backends = [
-        DjangoFilterBackend,
+        rest_filters.DjangoFilterBackend,
     ]
 
     # Default filterable fields
@@ -598,7 +599,7 @@ class POAttachmentList(generics.ListCreateAPIView, AttachmentMixin):
     serializer_class = POAttachmentSerializer
 
     filter_backends = [
-        DjangoFilterBackend,
+        rest_filters.DjangoFilterBackend,
     ]
 
     filter_fields = [