Activate graph database support spike

ActivateGraph.scala

package com.example.foo

import activateExampleContext._

class Person(
	var name: String)
		extends Vertex

class Knows(
	val from: Person,
	val to: Person,
	var since: Int)
		extends Edge[Person, Person]

object Main extends App {

	// Create graph
	transactional {
		val flavio = new Person("flavio")
		val felipe = new Person("felipe")
		new Knows(flavio, felipe, 2012)
	}

	// Query
	transactional {
		val flavio = select[Person].where(_.name :== "flavio").unique
		val result = flavio.->[Knows](_.since :>= 2011)
		println(result)
	}

}

trait Vertex extends Entity {
	def ->[E <: Edge[_, _]](f: ((E) => Unit)*) = List()
}
trait Edge[A <: Vertex, B <: Vertex] extends Entity {
	val from: A
	val to: B
}