derive and add a service to context post-validation

[crishoj]

Suppose I have some routes with a shared prefix:

new Elysia()
    .post('devices/:id/connect', (params: {id}) => getDevice(id).connect(),
        {params: t.Object({id: t.Numeric()})})
    .post('devices/:id/disconnect', (params: {id}) => getDevice(id).disconnect(),
        {params: t.Object({id: t.Numeric()})})
    .post('devices/:id/start', (params: {id}) => getDevice(id).start(),
        {params: t.Object({id: t.Numeric()})})
    .post('devices/:id/stop', (params: {id}) => getDevice(id).stop(),
        {params: t.Object({id: t.Numeric()})})

I'd like to group these routes and use something like derive to add device to the context, based in the route parameter:

new Elysia()
    .group('devices/:id', app => app
        .derive(({params: {id}}) => {
            return {device: getDevice(parseInt(id))} // ⚠️ `id` here is not yet validated or cast to a `number`
        })
        .post('devices/:id/connect', ({device}) => device.connect())
        .post('devices/:id/disconnect', ({device}) => device.disconnect())
        .post('devices/:id/start', ({device}) => device.start())
        .post('devices/:id/stop', ({device}) => device.stop())))

It works, but in derive the :id parameter has not yet been validated or cast to a number.

Is there an alternative to derive that runs post-validation?
Or, perhaps a way to add validation hooks to parameters in group prefix?

[crishoj]

Found the answer — just use resolve!

new Elysia()
    .group('devices/:id', {params: t.Object({id: t.Numeric()})}, app => app
        .resolve(({params: {id}}) => ({device: getDevice(id)}))
        .post('devices/:id/connect', ({device}) => device.connect())
        .post('devices/:id/disconnect', ({device}) => device.disconnect())
        .post('devices/:id/start', ({device}) => device.start())
        .post('devices/:id/stop', ({device}) => device.stop()))

Elysia is elegant ✨