added custom filter with tag support to products

utils/tag_filters.py

@@ -3,9 +3,15 @@ from products.models import Product
 
 
 class ProductTagFilter(django_filters.FilterSet):
-    tags = django_filters.CharFilter(field_name='tags.name', lookup_expr='iexact')
+    tags = django_filters.CharFilter(method='tag_filter')
 
     class Meta:
         model = Product
-        fields = ['name',]
+        fields = ['name', 'tags']
+
+    def tag_filter(self, queryset, name, value):
+        if name == 'tags':
+            return queryset.filter(tags=value)
+        return []
+