pass positional arguments to class-based views (Fixes #5199)

CHANGES.rst

@@ -7,7 +7,7 @@ Unreleased
 -   Require Werkzeug >= 2.3.6.
 -   Use ``flit_core`` instead of ``setuptools`` as build backend.
 -   Refactor how an app's root and instance paths are determined. :issue:`5160`
-
+-   Pass positional arguments to class-based views. :issue:`5199`
 
 Version 2.3.2
 -------------

src/flask/views.py

@@ -102,17 +102,17 @@ class View:
         """
         if cls.init_every_request:
 
-            def view(**kwargs: t.Any) -> ft.ResponseReturnValue:
+            def view(*args: t.Any, **kwargs: t.Any) -> ft.ResponseReturnValue:
                 self = view.view_class(  # type: ignore[attr-defined]
                     *class_args, **class_kwargs
                 )
-                return current_app.ensure_sync(self.dispatch_request)(**kwargs)
+                return current_app.ensure_sync(self.dispatch_request)(*args, **kwargs)
 
         else:
             self = cls(*class_args, **class_kwargs)
 
-            def view(**kwargs: t.Any) -> ft.ResponseReturnValue:
-                return current_app.ensure_sync(self.dispatch_request)(**kwargs)
+            def view(*args: t.Any, **kwargs: t.Any) -> ft.ResponseReturnValue:
+                return current_app.ensure_sync(self.dispatch_request)(*args, **kwargs)
 
         if cls.decorators:
             view.__name__ = name
@@ -178,7 +178,7 @@ class MethodView(View):
             if methods:
                 cls.methods = methods
 
-    def dispatch_request(self, **kwargs: t.Any) -> ft.ResponseReturnValue:
+    def dispatch_request(self, *args: t.Any, **kwargs: t.Any) -> ft.ResponseReturnValue:
         meth = getattr(self, request.method.lower(), None)
 
         # If the request method is HEAD and we don't have a handler for it
@@ -187,4 +187,4 @@ class MethodView(View):
             meth = getattr(self, "get", None)
 
         assert meth is not None, f"Unimplemented method {request.method!r}"
-        return current_app.ensure_sync(meth)(**kwargs)
+        return current_app.ensure_sync(meth)(*args, **kwargs)

tests/test_views.py

@@ -98,6 +98,42 @@ def test_view_decorators(app, client):
     assert rv.data == b"Awesome"
 
 
+def test_view_decorators_with_injected_args(app, client):
+    def add_arg(f):
+        def new_function(*args, **kwargs):
+            return f("Awesome", *args, **kwargs)
+
+        return new_function
+
+    class Index(flask.views.View):
+        decorators = [add_arg]
+
+        def dispatch_request(self, arg):
+            return arg
+
+    app.add_url_rule("/", view_func=Index.as_view("index"))
+    rv = client.get("/")
+    assert rv.data == b"Awesome"
+
+
+def test_method_based_view_decorators_with_injected_args(app, client):
+    def add_arg(f):
+        def new_function(*args, **kwargs):
+            return f("Awesome", *args, **kwargs)
+
+        return new_function
+
+    class Index(flask.views.MethodView):
+        decorators = [add_arg]
+
+        def post(self, arg):
+            return arg
+
+    app.add_url_rule("/", view_func=Index.as_view("index"))
+    rv = client.post("/")
+    assert rv.data == b"Awesome"
+
+
 def test_view_provide_automatic_options_attr():
     app = flask.Flask(__name__)