mongo replicaset rollback data

restore_rollback.rb

# http://docs.mongodb.org/manual/reference/bsondump/

fh = File.open("somefile.bson", "rb")
while not fh.eof? do
  obj = BSON.read_bson_document fh
  id = obj.delete "_id"
  # assume Thing is a Mongoid::Document
  thing = Thing.new obj
  thing["_id"] = id.to_s
  thing.save
end