Merge pull request #15 from Zaharid/dtfields

Enable ForwardRefs in dataclasses

Author: Zaharid

.github/workflows/pythonpackage.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
 
     steps:
     - uses: actions/checkout@v1

validobj/tests/__init__.py

@@ -2,6 +2,10 @@
 
 # https://docs.pytest.org/en/6.2.x/example/pythoncollection.html#customizing-test-collection
 
+collect_ignore = []
 
 if sys.version_info < (3, 12):  # pragma: nocover
-    collect_ignore = ["test_type_syntax.py"]
+    collect_ignore += ["test_type_syntax.py"]
+
+if sys.version_info < (3, 14):  # pragma: nocover
+    collect_ignore += ["test_delayed_dataclasses.py"]

validobj/tests/conftest.py

@@ -0,0 +1,16 @@
+from typing import Any
+import dataclasses
+
+from validobj import parse_input
+
+@dataclasses.dataclass
+class Linked:
+    value: Any
+    parents: Linked | list[Linked] | None = None
+
+
+def test_delayed_annotations():
+    inp = {'value': 1, 'parents': {'value': 2, 'parents': [{'value': 3}, {'value': 4, 'parents': {'value': 5}}]}}
+    assert parse_input(inp, Linked).parents.value == 2
+
+

validobj/tests/test_delayed_dataclasses.py

@@ -209,10 +209,13 @@ def _parse_dataclass(value, spec):
         header=f"Cannot process value into {_typename(spec)!r} because "
         f"fields do not match.",
     )
+    # Note: We don't use field.type because of https://github.com/python/cpython/issues/137891
+    types = spec.__annotations__
+
     res = {}
     field_dict = {
         # Look inside InitVar
-        f.name: f.type if not isinstance(f.type, dataclasses.InitVar) else f.type.type
+        f.name: types[f.name] if not isinstance(f.type, dataclasses.InitVar) else f.type.type
         for f in fields
     }
     for k, v in value.items():