Unset operation failing for MongoMapper model, can

We're on mongodb 2.0.0, mongo gem 1.4.1, mongo_mapper 0.9.2, rails 3.0.6.

We love MongoMapper, but we need helping resolving one nasty issue: we have a key carried over from some testing, but invoking obj.unset fails to do anything.

Specifically, we are trying to remove an "id" key (not "_id") because it's causing MM to treat obj.id as different from obj._id, which we don't want.

After clearing out the database, we ran these commands from a controller which does nothing else: (We also tried running the same code from the rails console, but it also fails.)

logger.info "#{Game.keys.keys.inspect}"
Game.unset({}, :id)
logger.info "#{Game.keys.keys.inspect}"
Game.unset(:id)
logger.info "#{Game.keys.keys.inspect}"

Output:

["jackpot", "players", "created_at", "puzzles", "ended_at", "player_index", "updated_at", "log", "_id", "id", "join_code", "puzzle_index"]
["jackpot", "players", "created_at", "puzzles", "ended_at", "player_index", "updated_at", "log", "_id", "id", "join_code", "puzzle_index"]
["jackpot", "players", "created_at", "puzzles", "ended_at", "player_index", "updated_at", "log", "_id", "id", "join_code", "puzzle_index"]

Current keys defined in our Game model:

  key :players, Array, :default => []
  key :player_index, Integer, :default => 0
  key :puzzles, Array, :default => []
  key :puzzle_index, Integer, :default => 0
  key :join_code, String, :default => nil
  key :jackpot, Integer, :default => 0
  key :log, Array, :default => []
  key :created_at, Time
  key :updated_at, Time
  key :ended_at, Time, :default => nil

Help?

Thanks!

It pains us to post the answer since this solidifies our status as "morons, idiots, fools, noobs, Jay Leno fans," but in case anyone else bumps into the same issue: while our model directory was clean in the dev environment, the model dir in the production environment contained old test files ... which contained an old model with the "id" key.

Obviously, removing the old files and the old models solved everything, though we're left with staggering bruises to our egos and to our heads (from excessive banging against the walls).