Fix support of custom error handler in Django decorator

Author: mik-laj

docs/integrations/django.md

@@ -66,7 +66,7 @@ Use `DjangoOpenAPIViewDecorator` with the OpenAPI object to create the decorator
 ``` python hl_lines="1 3 6"
 from openapi_core.contrib.django.decorators import DjangoOpenAPIViewDecorator
 
-openapi_validated = FlaskOpenAPIViewDecorator(openapi)
+openapi_validated = DjangoOpenAPIViewDecorator(openapi)
 
 
 @openapi_validated

openapi_core/contrib/django/decorators.py

@@ -48,6 +48,7 @@ def __init__(
 
         self.request_cls = request_cls
         self.response_cls = response_cls
+        self.errors_handler_cls = errors_handler_cls
 
     def __call__(self, view_func: Callable[..., Any]) -> Callable[..., Any]:
         """

tests/integration/contrib/django/data/v3.0/djangoproject/status/views.py

@@ -1,14 +1,27 @@
 from pathlib import Path
+from typing import Any
+from typing import Dict
 
 from django.http import HttpResponse
 from jsonschema_path import SchemaPath
 
 from openapi_core.contrib.django.decorators import DjangoOpenAPIViewDecorator
+from openapi_core.contrib.django.handlers import DjangoOpenAPIErrorsHandler
+
+
+class AppDjangoOpenAPIValidRequestHandler(DjangoOpenAPIErrorsHandler):
+    @classmethod
+    def format_openapi_error(cls, error: BaseException) -> Dict[str, Any]:
+        ret = DjangoOpenAPIErrorsHandler.format_openapi_error(error)
+        ret["title"] = ret["title"].upper()
+        return ret
+
 
 check_minimal_spec = DjangoOpenAPIViewDecorator.from_spec(
     SchemaPath.from_file_path(
         Path("tests/integration/data/v3.0/minimal_with_servers.yaml")
-    )
+    ),
+    errors_handler_cls=AppDjangoOpenAPIValidRequestHandler,
 )
 
 

tests/integration/contrib/django/test_django_project.py

@@ -460,3 +460,7 @@ def test_post_valid(self, client):
             )
 
         assert response.status_code == 405  # Method Not Allowed
+        assert (
+            response.json()["errors"][0]["title"]
+            == "OPERATION POST NOT FOUND FOR HTTP://PETSTORE.SWAGGER.IO/STATUS"
+        )