habitica/migrations/20131102_restore_task_ids.js

// mongo habitrpg ./node_modules/lodash/lodash.js ./migrations/20131028_task_subdocs_tags_invites.js

db.challenges.find().forEach(function(chal){
  _.each(chal.habits.concat(chal.dailys).concat(chal.todos).concat(chal.rewards), function(task){
    task.id = task.id || task._id;
  })
  try {
    db.challenges.update({_id:chal._id}, chal);
    db.groups.update({_id:chal.group}, {$addToSet:{challenges:chal._id}})
  } catch(e) {
    print(e);
  }
});

db.users.find().forEach(function(user){
  _.each(user.habits.concat(user.dailys).concat(user.todos).concat(user.rewards), function(task){
    task.id = task.id || task._id;
  })
  try {
    db.users.update({_id:user._id}, user);
  } catch(e) {
    print(e);
  }
});