Migration

User.find({'profile.picture': /twimg.*_normal/}, function(err, users, done) {
    if (err) { debug('Username err: ', err); next(err); }
    for (var i = 0; i < users.length; i++) {
        console.log(users[i].profile.picture);
        users[i].profile.picture = users[i].profile.picture.replace('_normal', '');
        users[i].save(function(err) {
            if (err) { return next(err); }
            done(err, user);
        });
        console.log(users[i].profile.picture);
    }
});