src/cpl_query/base/ordered_queryable.py

@@ -1,4 +1,5 @@
 from collections.abc import Callable
+from typing import Self
 
 from cpl_query.base.ordered_queryable_abc import OrderedQueryableABC
 from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
@@ -6,12 +7,12 @@ from cpl_query.iterable.iterable import Iterable
 
 
 class OrderedQueryable(OrderedQueryableABC):
-    r"""Implementation of :class: `cpl_query.extension.Iterable` `cpl_query.extension.OrderedIterableABC`"""
+    r"""Implementation of :class: `cpl_query.base.ordered_queryable_abc.OrderedQueryableABC`"""
 
     def __init__(self, _t: type, _values: Iterable = None, _func: Callable = None):
         OrderedQueryableABC.__init__(self, _t, _values, _func)
 
-    def then_by(self: OrderedQueryableABC, _func: Callable) -> OrderedQueryableABC:
+    def then_by(self, _func: Callable) -> Self:
         if self is None:
             raise ArgumentNoneException(ExceptionArgument.list)
 
@@ -22,7 +23,7 @@ class OrderedQueryable(OrderedQueryableABC):
 
         return OrderedQueryable(self.type, sorted(self, key=lambda *args: [f(*args) for f in self._funcs]), _func)
 
-    def then_by_descending(self: OrderedQueryableABC, _func: Callable) -> OrderedQueryableABC:
+    def then_by_descending(self, _func: Callable) -> Self:
         if self is None:
             raise ArgumentNoneException(ExceptionArgument.list)
 

src/cpl_query/base/queryable_abc.py

@@ -1,6 +1,12 @@
+from __future__ import annotations
+
 from typing import Optional, Callable, Union, Iterable, Self
+from typing import TYPE_CHECKING
 
 from cpl_query._helper import is_number
+
+if TYPE_CHECKING:
+    from cpl_query.base.ordered_queryable_abc import OrderedQueryableABC
 from cpl_query.base.sequence import Sequence
 from cpl_query.exceptions import (
     InvalidTypeException,
@@ -315,7 +321,7 @@ class QueryableABC(Sequence):
 
         return _func(min(self, key=_func))
 
-    def order_by(self, _func: Callable = None) -> "OrderedQueryableABC":
+    def order_by(self, _func: Callable = None) -> OrderedQueryableABC:
         r"""Sorts elements by function in ascending order
 
         Parameter

unittests/unittests_query/iterable_query_test_case.py

@@ -251,6 +251,8 @@ class IterableQueryTestCase(unittest.TestCase):
         self.assertEqual(res, s_res)
 
     def test_then_by_descending(self):
+        x = List(int, List.range(1, 10)).order_by(lambda x: x).th
+
         res = (
             self._tests.order_by_descending(lambda user: user.address.street)
             .then_by_descending(lambda user: user.address.nr)