ReactiveMongo reader writer handler to serialize nested seqs

gistfile1.txt

  implicit def MapReader[V,B <: BSONValue](implicit vr: BSONReader[B,V]) = new BSONDocumentReader[Seq[(String, V)]] {
    def read(bson: BSONDocument): Seq[(String, V)] = {
      val elements = bson.elements.map { tuple =>
        tuple._1 -> tuple._2.seeAsTry(vr).get
      }
      elements
    }
  }

  implicit def MapWriter[V,B <: BSONValue](implicit vw: BSONWriter[V,B]) = new BSONDocumentWriter[Seq[(String, V)]] {
    def write(map: Seq[(String, V)]): BSONDocument = {
      val elements = map.toStream.map { tuple =>
        tuple._1 -> vw.write(tuple._2)
      }
      BSONDocument(elements)
    }
  }