replace double % for some dialects

ormar/queryset/actions/filter_action.py

@@ -176,6 +176,6 @@ class FilterAction(QueryAction):
         clause_text = clause_text.replace(
             f"{self.table.name}.{self.column.name}", aliased_name
         )
-        clause_text.replace("%%", "%")  # remove doubles in some dialects
+        clause_text = clause_text.replace("%%", "%")  # remove doubles in some dialects
         clause = text(clause_text)
         return clause

tests/test_model_definition/test_fields_access.py

@@ -177,6 +177,7 @@ def test_combining_groups_together():
         group._nested_groups[1]._nested_groups[0].actions[0].table_prefix
     )
     category_prefix = group._nested_groups[1]._nested_groups[1].actions[0].table_prefix
+    group_str.replace()
     assert group_str == (
         f"( ( product.name LIKE '%Test%' ) "
         f"OR ( ( {price_list_prefix}_price_lists.name LIKE 'Aa%' ) "