//mongo habitrpg node_modules/lodash/lodash.js ./migrations/20140712_wiped_quest_membership.js
db.groups.find({type:'party','quest.key':{$ne:null},'quest.active':true},{quest:1}).forEach(function(group){
  var activeMembers = _.reduce(group.quest.members, function(m,v,k){
    if (v===true) m.push(k); return m;
  },[]);
  db.users.update(
    {_id:{$in: activeMembers}},
    {$set:{'party.quest.key':group.quest.key,'party.quest.completed':null}},
    {multi:true}
  );
});