fix: Unable to access nested list property

flask_restx/fields.py

@@ -66,6 +66,10 @@ def is_indexable_but_not_string(obj):
     return not hasattr(obj, "strip") and hasattr(obj, "__iter__")
 
 
+def is_integer_indexable(obj):
+    return isinstance(obj, list) or isinstance(obj, tuple)
+
+
 def get_value(key, obj, default=None):
     """Helper for pulling a keyed value off various types of objects"""
     if isinstance(key, int):
@@ -91,6 +95,11 @@ def _get_value_for_key(key, obj, default):
             return obj[key]
         except (IndexError, TypeError, KeyError):
             pass
+    if is_integer_indexable(obj):
+        try:
+            return obj[int(key)]
+        except (IndexError, TypeError, ValueError):
+            pass
     return getattr(obj, key, default)
 
 

tests/test_fields.py

@@ -1377,3 +1377,21 @@ def __getitem__(self, n):
 
         obj = Test("hi")
         assert fields.get_value("value", obj) == "hi"
+
+    def test_get_value_int_indexable_list(self):
+        assert fields.get_value('bar.0', {'bar': [42]}) == 42
+
+    def test_get_value_int_indexable_list_with_str(self):
+        assert fields.get_value('bar.abc', {'bar': [42]}) is None
+
+    def test_get_value_int_indexable_nested_list(self):
+        assert fields.get_value('bar.0.val', {'bar': [{'val': 42}]}) == 42
+
+    def test_get_value_int_indexable_tuple_with_str(self):
+        assert fields.get_value('bar.abc', {'bar': (42, 43)}) is None
+
+    def test_get_value_int_indexable_tuple(self):
+        assert fields.get_value('bar.0', {'bar': (42, 43)}) == 42
+
+    def test_get_value_int_indexable_nested_tuple(self):
+        assert fields.get_value('bar.0.val', {'bar': [{'val': 42}]}) == 42