Property

import reactivemongo.api.bson.BSONString
import acolyte.reactivemongo.{
 PreparedResponse, Property, Request, SimpleBody
}

val EmailXtr = Property("email") // Without scalac plugin

def resultA: PreparedResponse = ???
def resultB: PreparedResponse = ???
def resultC: PreparedResponse = ???
def resultD: PreparedResponse = ???
def resultE: PreparedResponse = ???

def check(request: Request) = request match {
 case Request("db.col", SimpleBody(EmailXtr(BSONString(e)))) =>
   // Request on db.col with an "email" string property,
   // anywhere in properties (possibly with others which are ignored there),
   // with `e` bound to extracted string value.
   println(e)
   resultB // similar to case resultA without scalac plugin

 case req =>
   sys.error("Unexpected request: " + req)
}