Useful way of injecting implicits in the scope. We add here a companion object with implicits for mongo database requests. Then make the object nested in the desired class by importing.

implicits_create_and_import.scala

object UserDaoImpl {

  object Implicits {

    implicit object AccountWriter extends BSONDocumentWriter[Account] {
      def write(acc: Account) = BSONDocument(
        "email" -> acc.email)
    }

    implicit object AccountReader extends BSONDocumentReader[Account] {
      def read(doc: BSONDocument) = Account(
        doc.getAs[String]("email").get,
        "",
        "",
        0)
    }
  }
}

class UserDaoImpl(db: DB) {
  val collection = db("users")

  import UserDaoImpl.Implicits._
  ...
}