Improve compatibility with web.View and support subclassing Views

tests/test_inheritance.py

@@ -0,0 +1,58 @@
+from typing import Any
+
+from aiohttp_pydantic import PydanticView
+
+
+def count_wrappers(obj: Any) -> int:
+    """Count the number of times that an object is wrapped."""
+    i = 0
+    while i < 10:
+        try:
+            obj = obj.__wrapped__
+        except AttributeError:
+            return i
+        else:
+            i += 1
+    raise RuntimeError("Too many wrappers")
+
+
+class ViewParent(PydanticView):
+    async def put(self):
+        pass
+
+    async def delete(self):
+        pass
+
+
+class ViewParentNonPydantic:
+    async def post(self):
+        pass
+
+
+class ViewChild(ViewParent, ViewParentNonPydantic):
+    async def get(self):
+        pass
+
+    async def delete(self):
+        pass
+
+    async def not_allowed(self):
+        pass
+
+
+def test_allowed_methods_are_set_correctly():
+    assert ViewParent.allowed_methods == {"PUT", "DELETE"}
+    assert ViewChild.allowed_methods == {"GET", "POST", "PUT", "DELETE"}
+
+
+def test_allowed_methods_get_decorated_exactly_once():
+    assert count_wrappers(ViewParent.put) == 1
+    assert count_wrappers(ViewParent.delete) == 1
+    assert count_wrappers(ViewChild.get) == 1
+    assert count_wrappers(ViewChild.post) == 1
+    assert count_wrappers(ViewChild.put) == 1
+    assert count_wrappers(ViewChild.post) == 1
+    assert count_wrappers(ViewChild.put) == 1
+
+    assert count_wrappers(ViewChild.not_allowed) == 0
+    assert count_wrappers(ViewParentNonPydantic.post) == 0