[BUG] AttributeError: 'method' object has no attribute '_ninja_operation'

[shrpow]

Describe the bug
When I'm trying to create a class-based router using the ApiRouter class as a base class, I receive this error at the time of self.add_api_operations:

    view_func._ninja_operation = operation  # type: ignore
    ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'method' object has no attribute '_ninja_operation'

When I comment out this line in the source code for django-ninja my project works absolutely correctly.

Code snippet:

class TestRouter(Router):
    def __init__(self: Self) -> None:
        super().__init__()

        self.tags = ["Router"]

        self.add_api_operation(
            methods=["POST"],
            path="/asd",
            view_func=self.hello,
        )

    def hello(self: Self, request: WSGIRequest) -> str:
        return "ok"

Versions (please complete the following information):

• Python version: 3.12.3

Note you can quickly get this by runninng in ./manage.py shell this line:

>>> import django; import pydantic; import ninja; django.__version__; ninja.__version__; pydantic.__version__
'5.1.3'
'1.3.0'
'2.10.4'

[vitalik]

@shrpow well methods in python work a bit different than module functions

try the following:

class TestRouter(Router):
    def __init__(self: Self) -> None:
        super().__init__()

        self.tags = ["Router"]


        def hello(request: WSGIRequest) -> str:
            # you can access self her
            return "ok"

        self.add_api_operation(
            methods=["POST"],
            path="/asd",
            view_func=hello,
        )


``