Unset operation failing for MongoMapper model, cannot delete / remove key from model

Question

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

Answer 1

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).