[3.15] Add ValidationError params argument & default_params attribute (#338)

* [3.15] Add ValidationError params argument & default_params attribute

* [pre-commit.ci] auto fixes from pre-commit.com hooks

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: intgr

rest_framework-stubs/exceptions.pyi

@@ -1,5 +1,5 @@
 from collections.abc import Mapping, Sequence
-from typing import Any
+from typing import Any, ClassVar
 
 from django.http import HttpRequest, JsonResponse
 from django_stubs_ext import StrOrPromise
@@ -43,6 +43,10 @@ class APIException(Exception):
 class ValidationError(APIException):
     # ValidationError wraps `detail` in a list if it's not already a list/dict.
     detail: list[_Detail] | dict[str, _Detail]
+    default_params: ClassVar[Mapping[str, Any]]
+    def __init__(
+        self, detail: _Detail | None = ..., code: str | None = ..., params: Mapping[str, Any] | None = ...
+    ) -> None: ...
 
 class ParseError(APIException): ...
 class AuthenticationFailed(APIException): ...

scripts/stubtest/allowlist_todo.txt

@@ -140,8 +140,6 @@ rest_framework.views.GenericView
 rest_framework.RemovedInDRF317Warning
 rest_framework.authtoken.migrations.0004_alter_tokenproxy_options
 rest_framework.compat.distinct
-rest_framework.exceptions.ValidationError.__init__
-rest_framework.exceptions.ValidationError.default_params
 rest_framework.fields.DecimalField.__init__
 rest_framework.fields.Field.__class_getitem__
 rest_framework.fields.logger
@@ -160,8 +158,6 @@ rest_framework.serializers.LIST_SERIALIZER_KWARGS_REMOVE
 rest_framework.serializers.ListSerializer.run_child_validation
 rest_framework.serializers.ModelSerializer.get_unique_together_constraints
 rest_framework.serializers.Serializer.set_value
-rest_framework.serializers.ValidationError.__init__
-rest_framework.serializers.ValidationError.default_params
 rest_framework.templatetags.rest_framework.optional_logout
 rest_framework.utils.encoders.CustomScalar
 rest_framework.utils.field_mapping.get_unique_validators