site RollDice
    description:                Implement a simple game of dice using behaviour and step
    location:                   model.dbquity.com/examples/behaviour
    version:                    0.10.0
    area Table
        integer Players
            default:            3
        integer Target
            default:            13
        step NewGame
            guard:              Players > 1 and Players < 10 and Target > 6 and Target < 36
            behaviour:          add(Game, Players: Players, Target: Target)
            autocommit          # make Game available on other devices
        entity Game
            collection:         Games
            readonly
            integer Players
            integer Target
            function IsDone
                expression:     Scores.any(Amount = Target)
            behaviour:          # each round, players toss concurrently
                while not IsDone() do
                    with player in 1..Players || Toss(player)
            step Toss
                parameter Player
                behaviour:      # user triggered, lazy-create Score, random update
                    getoradd(Score: Player).set(Amount: NextAmount())
                autocommit      # persist making others see the toss
            entity Score
                collection:     Scores
                integer Player
                integer Amount
                identity:       Player
                function NextAmount
                    expression: if Amount < Game.Target then Amount + random(1,6)
                                                        else Amount - random(1,6)