#[Object]
impl UserQuery {
    #[graphql(guard = MyAuthGuard.and(UserRoleGuard::new(UserRole::Admin).or(UserRoleGuard::new(UserRole::User))))]
    async fn get_user_profile<'ctx>(&self, ctx: &Context<'ctx>) -> Result<User> {
      // (...)
    }
}

let query_root = dynamic::Object::new("QueryRoot").field(
    dynamic::Field::new("get_user_profile", dynamic::TypeRef::named("User"), |ctx| {
        dynamic::FieldFuture::new(async move {
            // (...)
        })
    })
);