mongo-scala-driver first example.scala

// Model
case class User(val name: String)

// Factory object:
object User extends AbstractShape[User] {
  // one scalar field called "name"
  object name extends Scalar[String]("name", _.name) with Functional[String]

  // fields list
  override lazy val * = name :: Nil

  // How to extract the model instance from a MongoDB native object?
  override def factory(dbo: DBObject): Option[User] =
    for {val name(n) <- Some(dbo)} yield new User(n)
}

// Suppose we have a DBCollection:
val dbColl: DBCollection
// Let's make it look like it stores User instances:
val users = dbColl of User

// Insert few users:
def createUser(i: Int) = User("User"+i)
for {val obj <- Array.fromFunction(createUser)(10) }
  users << obj

// Test emptiness:
if (users.isEmpty) ...
// Get the first user
val first: Option[User] = users.firstOption
// Walk though the collection (you are free to use any filter/flatMap/map/etc.
for {val u <- users} ...

// Get only first 2
for {val u <- User take 2 in users} ...
// Skip first 5 and get 2 users
for {val u <- User drop 5 take 2 in users} ...

// Query by name
val user3 = (User where {User.name eq_? "User3"} take 1 in users).firstOption
// Query by regexp
val endingBy5 = User.name ~ "r5$".r in users