Features: 1) Replace custom TagNameListFilter with RelatedOnlyFieldListFilter for tags; 2) Replace custom VendorNameListFilter with RelatedOnlyFieldListFilter for vendors;

Fixes: None;

Extra: 1) Remove redundant custom list filter classes for tags and vendors; 2) Streamline ProductAdmin list_filter configuration;

core/admin.py

@@ -161,53 +161,14 @@ class StockInline(TabularInline):
     verbose_name_plural = _("stocks")
 
 
-class TagNameListFilter(admin.SimpleListFilter):
-    title = _("tag name")
-    parameter_name = "tags_tag_name"
-
-    def lookups(self, request, model_admin):
-        qs = model_admin.get_queryset(request)
-        tags = qs.values_list("tags__tag_name", flat=True).distinct()
-        return [(tag, tag) for tag in tags if tag]
-
-    def queryset(self, request, queryset):
-        if self.value():
-            values = [v.strip() for v in self.value().split(",") if v.strip()]
-            if values:
-                return queryset.filter(tags__tag_name__in=values)
-        return queryset
-
-
-class VendorNameListFilter(admin.SimpleListFilter):
-    title = _("vendor")
-    parameter_name = "stocks_vendor_name"
-
-    def lookups(self, request, model_admin):
-        qs = model_admin.get_queryset(request)
-        vendors = (
-            qs.values_list("stocks__vendor__name", flat=True)
-            .distinct()
-        )
-        return [(v, v) for v in vendors if v]
-
-    def queryset(self, request, queryset):
-        val = self.value()
-        if not val:
-            return queryset
-
-        values = [v.strip() for v in val.split(",") if v.strip()] if isinstance(val, str) else [v for v in val if v]
-
-        return queryset.filter(stocks__vendor__name__in=values)
-
-
 @admin.register(Product)
 class ProductAdmin(BasicModelAdmin):
     list_display = ("name", "partnumber", "is_active", "category", "brand", "price", "rating", "modified")
 
     list_filter = (
         "is_active",
-        TagNameListFilter,
+        ("tags__tag_name", admin.RelatedOnlyFieldListFilter),
-        VendorNameListFilter,
+        ("stocks__vendor__name", admin.RelatedOnlyFieldListFilter),
         "created",
         "modified",
     )