[Flask -> MethodView] How to use Type annotation with methodviews?

[husudosu]

Unfortunetly when I try to use type annotation with my MethodView class with Spectree I get the next error:
bash TypeError: LoginAPI.post() missing 1 required positional argument: 'json'

My code looks like this:

Flask methodview

class LoginAPI(MethodView):

    @jwt_required(optional=True)
    @spec.validate(
        resp=Response(
            HTTP_200=MessageSchema,
            HTTP_401=MessageSchema
        ),
        tags=["auth"],
        validation_error_status=400
    )
    def post(self, json: LoginSchema):
        try:
            if current_user:
                return jsonify({"message": "Already logged in!"}), 400
            access_token, refresh_token = user_service.local_login(json)

            resp = make_response({"message": "logged in."})
            set_access_cookies(resp, access_token)
            set_refresh_cookies(resp, refresh_token)

            return resp
        except (InvalidCredentialsException, UserNotActivatedException) as e:
            return jsonify({"message": e.message}), 401

login_view = LoginAPI.as_view("login-view")
auth_bp.add_url_rule("/login", methods=["POST"], view_func=login_view)

My schema

from pydantic.v1 import BaseModel, Field
from typing import List, Optional

class LoginSchema(BaseModel):
    username: str = Field(description="Username")
    password: str = Field(description="Password")
    remember_me: Optional[bool] = Field(
        default=False, description="Remember me")

    class Config:
        schema_extra = {
            "example": {
                "username": "user",
                "password": "passsword",
                "remember_me": False
            }
        }

My workaround

As workaround I can use json parameter on the spec.validate decorator and parse schema again:

class LoginAPI(MethodView):

    @jwt_required(optional=True)
    @spec.validate(
        resp=Response(
            HTTP_200=MessageSchema,
            HTTP_401=MessageSchema
        ),
        tags=["auth"],
        json=LoginSchema,
        validation_error_status=400
    )
    def post(self):
        try:
            if current_user:
                return jsonify({"message": "Already logged in!"}), 400

            # FIXME: Type annotation not working when using methodview.
            access_token, refresh_token = user_service.local_login(
                LoginSchema(**request.json))

            resp = make_response({"message": "logged in."})
            set_access_cookies(resp, access_token)
            set_refresh_cookies(resp, refresh_token)

            return resp
        except (InvalidCredentialsException, UserNotActivatedException) as e:
            return jsonify({"message": e.message}), 401

login_view = LoginAPI.as_view("login-view")
auth_bp.add_url_rule("/login", methods=["POST"], view_func=login_view)

Is it possible to go with the first implementation somehow?

[kemingy]

Did you forget the annotations=True when you init SpecTree?

spec = SpecTree("flask", annotations=True)

[husudosu]

Adding annotations solved the issue! Thank you!