Example of MongoRecord and MongoMetaRecord without using singleton meta object

MongoMetaRecordExample.scala

// This is an example of how one can use MongoRecord and it's `meta` object MongoMetaRecord without
// using regular Scala singleton object.
//
// This way you can set Mongo DB connection identifier for each meta object and have multiple
// meta objects available. Usually you would not want to do that unless you use multiple databases
// in the same application. My motivation was that Spray unit tests would run concurrently with Akka
// ActorSystem and regular Lift dependency injection would not work because it's scope is ThreadLocal.
//
// Some more details here:
// https://groups.google.com/forum/#!topic/liftweb/5NfI9DxQ99Q

package com.izmailoff

import com.izmailoff.common.db.connection.MongoConfig
import net.liftweb.mongodb.record.{MongoMetaRecord, MongoRecord}
import net.liftweb.mongodb.record.field.ObjectIdPk
import net.liftweb.record.field.IntField
import com.foursquare.rogue.LiftRogue._

// this has to be a class, not a trait
abstract class SomethingElse extends MongoRecord[SomethingElse] with ObjectIdPk[SomethingElse] {
  object something extends IntField(this)
}

trait SomethingElseMeta extends SomethingElse with MongoMetaRecord[SomethingElse] {
  self: MongoMetaRecord[SomethingElse] =>

  override def meta = self

  override protected def instantiateRecord: SomethingElse =
    new SomethingElse {
      override val meta = self
    }

  override def collectionName = "something"
}


object RunMe extends App {

  // regular Mongo connection initialization
  MongoConfig.init()

  // create meta object:
  val smthElse = new SomethingElseMeta {}

  // save a few docs:
  val rec1 = smthElse.createRecord
  println("REC1 " + rec1 + " fields: " + rec1.fields())
  val rec2 = rec1.something(1)
  println("REC2 " + rec2 + " fields: " + rec2.fields())
  val rec3 = rec2.save
  println("REC3 " + rec3 + " fields: " + rec3.fields())
  smthElse.createRecord.something(2).save
  smthElse.createRecord.something(3).save

  // test that find works as well
  println(smthElse.findAll)
  println(smthElse.where(_.something eqs 1).fetch())
}