[Fix] Allow StrPromise to be used in exceptions (#297)

Co-authored-by: Xavier Francisco <[email protected]>

Author: XF-FW

rest_framework-stubs/exceptions.pyi

@@ -4,6 +4,7 @@ from typing import Any
 from typing_extensions import TypeAlias
 
 from django.http import HttpRequest, JsonResponse
+from django_stubs_ext import StrOrPromise
 from rest_framework.renderers import BaseRenderer
 from rest_framework.request import Request
 
@@ -15,7 +16,7 @@ class ErrorDetail(str):
     code: str | None
     def __new__(cls, string: str, code: str | None = ...): ...
 
-_Detail: TypeAlias = str | list[Any] | dict[str, Any]
+_Detail: TypeAlias = StrOrPromise | list[Any] | dict[str, Any]
 
 class APIException(Exception):
     status_code: int

scripts/typecheck_tests.py

@@ -106,7 +106,7 @@
         "Dict entry",
         '"FieldValues"',
         'base class "Field" defined the type as "bool"',
-        'Invalid index type "int" for "Union[str, List[Any], Dict[str, Any]]"; expected type "str"',
+        'Invalid index type "int" for "Union[str, _StrPromise, List[Any], Dict[str, Any]]"; expected type "str"',
         'Item "str" of "Union[str, Any]" has no attribute "code"',
         'Argument "default" to "CharField" has incompatible type',
         '"MultipleChoiceField" has no attribute "partial"',
@@ -152,7 +152,7 @@
         'Cannot assign multiple types to name "composed_perm" without an explicit "Type[...]" annotation',
     ],
     "test_relations.py": [
-        'Invalid index type "int" for "Union[str, List[Any], Dict[str, Any]]"; expected type "str"',
+        'Invalid index type "int" for "Union[str, _StrPromise, List[Any], Dict[str, Any]]"; expected type "str"',
         'Argument "queryset" to "HyperlinkedRelatedField" has incompatible type',
         'Incompatible return value type (got "None", expected "HttpResponseBase',
         'Argument 2 to "re_path" has incompatible type "Callable[[], None]"; expected "Callable[..., HttpResponseBase]"',  # noqa: E501
@@ -217,7 +217,7 @@
         'Argument 1 to "to_internal_value" of "Field" has incompatible type "object"',
     ],
     "test_validation_error.py": [
-        'Argument "detail" to "ValidationError" has incompatible type "Tuple[str, str]"; expected "Optional[Union[str, List[Any], Dict[str, Any]]]"',  # noqa: E501
+        'Argument "detail" to "ValidationError" has incompatible type "Tuple[str, str]"; expected "Optional[Union[Union[str, _StrPromise], List[Any], Dict[str, Any]]]"',  # noqa: E501
     ],
     "test_validators.py": [
         'Argument "queryset" to "BaseUniqueForValidator" has incompatible type "object";'

tests/typecheck/test_exceptions.yml

@@ -15,3 +15,12 @@
         status_code = 200
         default_detail = {"ok": "everything"}
         default_code = "ok"
+- case: test_exception_declaration_lazystr
+  main: |
+    from django.utils.translation import gettext_lazy as _
+    from rest_framework import exceptions
+
+    class MyException(exceptions.APIException):
+        status_code = 200
+        default_detail = _("Está tudo bem")
+        default_code = "ok"