still trying to order products

products/tests.py

@@ -209,11 +209,11 @@ class ProductViewSetTest(APITestCase):
 
         # Assert access is granted
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        # TODO: assert correct order
-        previous_date = datetime.datetime.now()
-        for instance in payload:
-            self.assertTrue(datetime.datetime.fromisoformat(instance['created'][:-1]) < previous_date)
-            previous_date = datetime.datetime.fromisoformat(instance['created'][:-1])
+        # assert correct order
+        dates = [d['created'][:-1] for d in payload]
+        for i in range(len(dates)-1):
+            # first instance should be most recent
+            self.assertTrue(datetime.datetime.fromisoformat(dates[i]) > datetime.datetime.fromisoformat(dates[i+1]))
 
     # authenticated user
     def test_auth_user_can_list_instances(self):

products/views.py

@@ -27,7 +27,7 @@ from history.models import HistorySync
 from back_latienda.permissions import IsCreator
 from .utils import extract_search_filters, find_related_products_v3, find_related_products_v6
 from utils.tag_serializers import TaggitSerializer
-from utils.tag_filters import ProductTagFilter
+from utils.tag_filters import ProductTagFilter, ProductOrderFilter
 
 
 logging.basicConfig(
@@ -42,7 +42,7 @@ class ProductViewSet(viewsets.ModelViewSet):
       queryset = Product.objects.all()
       serializer_class = ProductSerializer
       permission_classes = [IsAuthenticatedOrReadOnly, IsCreator]
-      # filter_backends = [ProductTagFilter, OrderingFilter]
+      # filter_backends = [ProductTagFilter, ProductOrderFilter]
       # ordering_fields = ['created']
       filterset_class = ProductTagFilter
       filterset_fields = ['name', 'tags', 'category', 'attributes', 'company', 'created']

utils/tag_filters.py

@@ -1,5 +1,7 @@
 import django_filters
 
+from rest_framework.filters import BaseFilterBackend
+
 from companies.models import Company
 from products.models import Product
 
@@ -26,10 +28,19 @@ class ProductTagFilter(django_filters.FilterSet):
 
     class Meta:
         model = Product
-        fields = ['name', 'tags', 'category', 'attributes', 'company', 'created']
+        fields = ['name', 'tags', 'category', 'attributes', 'company', 'created',]
 
     def tag_filter(self, queryset, name, value):
         return queryset.filter(**{
             name: value,
         })
 
+
+class ProductOrderFilter(BaseFilterBackend):
+    def filter_queryset(self, request, queryset, view):
+        order_field = request.GET.get('order', None)
+        if order_field is not None:
+            return queryset.order_by(order_field)
+        else:
+            return queryset
+