import com.mongodb.*

// connect
mongo = new Mongo('localhost', 27017)
mongo.dropDatabase('things')
db = mongo.getDB('things')

owners = db.getCollection('owners')
tasks = db.getCollection('tasks')

// owners and tasks
owners.insert(new BasicDBObject(['name': 'Jim']))
tasks.insert(new BasicDBObject(['name': 'read']))
tasks.insert(new BasicDBObject(['name': 'sleep']))

// update jim with tasks: reading and sleeping
readingTask = tasks.findOne(new BasicDBObject(['name':'read']))
sleepingTask = tasks.findOne(new BasicDBObject(['name':'sleep']))

// atomic update: can be done with $set or $pushAll
query = new BasicDBObject(['name':'Jim'])
update = new BasicDBObject(['$pushAll':
                            ['tasks':
                             [
                               new DBRef(db, 'tasks', readingTask._id),
                               new DBRef(db, 'tasks', sleepingTask._id)
                             ]
                            ]
                           ])


owners.update(query, update)

// get Jim fresh again and display his tasks
freshJim = owners.findOne(new BasicDBObject(['name':'Jim']))

println "Jim's tasks are:"
freshJim.get('tasks').each {
  println it.fetch().name
}