Features: 1) Ensure querysets return distinct results in filters;

Fixes: 1) Address potential duplication issue in querysets;

Extra:

core/filters.py

@@ -48,19 +48,31 @@ class CaseInsensitiveListFilter(BaseInFilter, CharFilter):
 class ProductFilter(FilterSet):
     uuid = UUIDFilter(field_name="uuid", lookup_expr="exact", label=_("UUID"))
     name = CharFilter(field_name="name", lookup_expr="icontains", label=_("Name"))
-    categories = CaseInsensitiveListFilter(field_name="category__name", label=_("Categories"))
+    categories = CaseInsensitiveListFilter(
+        field_name="category__name", label=_("Categories")
+    )
     category_uuid = CharFilter(method="filter_category", label="Category (UUID)")
-    categories_slugs = CaseInsensitiveListFilter(field_name="category__slug", label=_("Categories Slugs"))
+    categories_slugs = CaseInsensitiveListFilter(
+        field_name="category__slug", label=_("Categories Slugs")
+    )
     tags = CaseInsensitiveListFilter(field_name="tags__tag_name", label=_("Tags"))
-    min_price = NumberFilter(field_name="stocks__price", lookup_expr="gte", label=_("Min Price"))
+    min_price = NumberFilter(
-    max_price = NumberFilter(field_name="stocks__price", lookup_expr="lte", label=_("Max Price"))
+        field_name="stocks__price", lookup_expr="gte", label=_("Min Price")
+    )
+    max_price = NumberFilter(
+        field_name="stocks__price", lookup_expr="lte", label=_("Max Price")
+    )
     is_active = BooleanFilter(field_name="is_active", label=_("Is Active"))
     brand = CharFilter(field_name="brand__name", lookup_expr="iexact", label=_("Brand"))
     attributes = CharFilter(method="filter_attributes", label=_("Attributes"))
-    quantity = NumberFilter(field_name="stocks__quantity", lookup_expr="gt", label=_("Quantity"))
+    quantity = NumberFilter(
+        field_name="stocks__quantity", lookup_expr="gt", label=_("Quantity")
+    )
     slug = CharFilter(field_name="slug", lookup_expr="exact", label=_("Slug"))
     is_digital = BooleanFilter(field_name="is_digital", label=_("Is Digital"))
-    include_subcategories = BooleanFilter(method="filter_include_flag", label=_("Include sub-categories"))
+    include_subcategories = BooleanFilter(
+        method="filter_include_flag", label=_("Include sub-categories")
+    )
 
     order_by = OrderingFilter(
         fields=(
@@ -111,13 +123,16 @@ class ProductFilter(FilterSet):
                 )
                 self.queryset = self.queryset.annotate(
                     rating=Coalesce(
-                        Subquery(feedback_qs, output_field=FloatField()), Value(0, output_field=FloatField())
+                        Subquery(feedback_qs, output_field=FloatField()),
+                        Value(0, output_field=FloatField()),
                     )
                 )
 
     def filter_include_flag(self, queryset, **_kwargs):
         if not self.data.get("category_uuid"):
-            raise BadRequest(_("there must be a category_uuid to use include_subcategories flag"))
+            raise BadRequest(
+                _("there must be a category_uuid to use include_subcategories flag")
+            )
         return queryset
 
     def filter_attributes(self, queryset, _name, value):
@@ -240,7 +255,8 @@ class ProductFilter(FilterSet):
                 )
                 qs = qs.annotate(
                     rating=Coalesce(
-                        Subquery(feedback_qs, output_field=FloatField()), Value(0, output_field=FloatField())
+                        Subquery(feedback_qs, output_field=FloatField()),
+                        Value(0, output_field=FloatField()),
                     )
                 )
         return qs.distinct()
@@ -252,14 +268,26 @@ class OrderFilter(FilterSet):
         label=_("Search (ID, product name or part number)"),
     )
 
-    min_buy_time = DateTimeFilter(field_name="buy_time", lookup_expr="gte", label=_("Bought after (inclusive)"))
+    min_buy_time = DateTimeFilter(
-    max_buy_time = DateTimeFilter(field_name="buy_time", lookup_expr="lte", label=_("Bought before (inclusive)"))
+        field_name="buy_time", lookup_expr="gte", label=_("Bought after (inclusive)")
+    )
+    max_buy_time = DateTimeFilter(
+        field_name="buy_time", lookup_expr="lte", label=_("Bought before (inclusive)")
+    )
 
     uuid = UUIDFilter(field_name="uuid", lookup_expr="exact")
-    user_email = CharFilter(field_name="user__email", lookup_expr="iexact", label=_("User email"))
+    user_email = CharFilter(
-    user = UUIDFilter(field_name="user__uuid", lookup_expr="exact", label=_("User UUID"))
+        field_name="user__email", lookup_expr="iexact", label=_("User email")
+    )
+    user = UUIDFilter(
+        field_name="user__uuid", lookup_expr="exact", label=_("User UUID")
+    )
     status = CharFilter(field_name="status", lookup_expr="icontains", label=_("Status"))
-    human_readable_id = CharFilter(field_name="human_readable_id", lookup_expr="exact", label=_("Human Readable ID"))
+    human_readable_id = CharFilter(
+        field_name="human_readable_id",
+        lookup_expr="exact",
+        label=_("Human Readable ID"),
+    )
 
     order_by = OrderingFilter(
         fields=(
@@ -299,11 +327,20 @@ class OrderFilter(FilterSet):
 
 class WishlistFilter(FilterSet):
     uuid = UUIDFilter(field_name="uuid", lookup_expr="exact")
-    user_email = CharFilter(field_name="user__email", lookup_expr="iexact", label=_("User email"))
+    user_email = CharFilter(
-    user = UUIDFilter(field_name="user__uuid", lookup_expr="exact", label=_("User UUID"))
+        field_name="user__email", lookup_expr="iexact", label=_("User email")
+    )
+    user = UUIDFilter(
+        field_name="user__uuid", lookup_expr="exact", label=_("User UUID")
+    )
 
     order_by = OrderingFilter(
-        fields=(("uuid", "uuid"), ("created", "created"), ("modified", "modified"), ("?", "random"))
+        fields=(
+            ("uuid", "uuid"),
+            ("created", "created"),
+            ("modified", "modified"),
+            ("?", "random"),
+        )
     )
 
     class Meta:
@@ -317,7 +354,9 @@ class CategoryFilter(FilterSet):
     parent_uuid = CharFilter(method="filter_parent_uuid", label=_("Parent"))
     slug = CharFilter(field_name="slug", lookup_expr="exact", label=_("Slug"))
     whole = BooleanFilter(
-        field_name="whole", label=_("Whole category(has at least 1 product or not)"), method="filter_whole_categories"
+        field_name="whole",
+        label=_("Whole category(has at least 1 product or not)"),
+        method="filter_whole_categories",
     )
     tags = CaseInsensitiveListFilter(field_name="tags__tag_name", label=_("Tags"))
     level = NumberFilter(field_name="level", lookup_expr="exact", label=_("Level"))
@@ -332,7 +371,16 @@ class CategoryFilter(FilterSet):
 
     class Meta:
         model = Category
-        fields = ["uuid", "name", "parent_uuid", "slug", "tags", "level", "order_by", "whole"]
+        fields = [
+            "uuid",
+            "name",
+            "parent_uuid",
+            "slug",
+            "tags",
+            "level",
+            "order_by",
+            "whole",
+        ]
 
     def filter_whole_categories(self, queryset, _name, value):
         has_own_products = Exists(Product.objects.filter(category=OuterRef("pk")))
@@ -364,7 +412,9 @@ class CategoryFilter(FilterSet):
 class BrandFilter(FilterSet):
     uuid = UUIDFilter(field_name="uuid", lookup_expr="exact")
     name = CharFilter(field_name="name", lookup_expr="icontains", label=_("Name"))
-    categories = CaseInsensitiveListFilter(field_name="categories__uuid", lookup_expr="exact", label=_("Categories"))
+    categories = CaseInsensitiveListFilter(
+        field_name="categories__uuid", lookup_expr="exact", label=_("Categories")
+    )
 
     order_by = OrderingFilter(
         fields=(
@@ -381,8 +431,16 @@ class BrandFilter(FilterSet):
 
 class FeedbackFilter(FilterSet):
     uuid = UUIDFilter(field_name="uuid", lookup_expr="exact", label=_("UUID"))
-    product_uuid = UUIDFilter(field_name="order_product__product__uuid", lookup_expr="exact", label=_("Product UUID"))
+    product_uuid = UUIDFilter(
-    user_uuid = UUIDFilter(field_name="order_product__order__user__uuid", lookup_expr="exact", label=_("User UUID"))
+        field_name="order_product__product__uuid",
+        lookup_expr="exact",
+        label=_("Product UUID"),
+    )
+    user_uuid = UUIDFilter(
+        field_name="order_product__order__user__uuid",
+        lookup_expr="exact",
+        label=_("User UUID"),
+    )
 
     order_by = OrderingFilter(
         fields=(
@@ -402,8 +460,12 @@ class FeedbackFilter(FilterSet):
 
 class AddressFilter(FilterSet):
     uuid = UUIDFilter(field_name="uuid", lookup_expr="exact", label=_("UUID"))
-    user_uuid = UUIDFilter(field_name="user__uuid", lookup_expr="exact", label=_("User UUID"))
+    user_uuid = UUIDFilter(
-    user_email = CharFilter(field_name="user__email", lookup_expr="iexact", label=_("User email"))
+        field_name="user__uuid", lookup_expr="exact", label=_("User UUID")
+    )
+    user_email = CharFilter(
+        field_name="user__email", lookup_expr="iexact", label=_("User email")
+    )
 
     order_by = OrderingFilter(
         fields=(