I've been using Flask-Classy for my server, and it works great. However, I've come across a use case that I haven't seen written about, but it's a pretty common use case, so I'd be shocked if it's not possible.

I have two APIs which I want to nest, and by that I mean I have:

```
class UsersView(FlaskView):
    decorators = [jwt_required()]
    route_prefix = '/api/v1/'

    def index(self):
    ...

```

which is located at <http://example.com/api/v1/users> and I can access user 1 via <http://example.com/api/v1/users/1>

Now, how would I write the FlaskView which would let me do something like this?
<http://example.com/api/v1/users/1/devices/3>

When I try embedding the resource id in the route\_prefix, I get a keyword argument error: 

```
class DevicesView(FlaskView):
    decorators = [jwt_required()]
    route_prefix = '/api/v1/users/<user_id>/'

    def index(self):
    ...

```

TypeError: index() got an unexpected keyword argument 'user\_id'

One last point is that I can, naturally, use kwargs:

```
route_prefix = '/api/v1/users/<user_id>/'

def test(self, **kwargs):
    print kwargs['user_id']

```

<http://example.com/api/v1/users/103/devices> will spit out '103', however, using kwargs feels kinda hokey. Is there a better way?