mr non sharded collection

gistfile1.js

function () {
        var t, user_id;
        t = this;
        user_id = t._id.toString();
        this._followed_user_ids.forEach(function (fuid) {
                var u;
                u = db.user.findOne({
                        _id: ObjectId(fuid)
                });
                if (u) {
                        return u._followed_user_ids.forEach(function (fuid2) {
                                var pd, u2, user_pds, _i, _len, _ref;
                                if (t._followed_user_ids.indexOf(fuid2) === -1 && fuid2 !== user_id) {
                                        u2 = db.user.findOne({
                                                _id: ObjectId(fuid2)
                                        }, {
                                                'name': 1
                                        });
                                        if (u2) {
                                                user_pds = [];
                                                _ref = t.personal_descs;
                                                for (_i = 0, _len = _ref.length; _i < _len; _i++) {
                                                        pd = _ref[_i];
                                                        pd = pd.replace(/^\s|\s$/g, "");
                                                        pd = pd.toLowerCase();
                                                        user_pds.push(pd);
                                                }
                                                return emit(fuid2 + ":" + user_id, {
                                                        user_id: ObjectId(user_id),
                                                        user_pds: user_pds,
                                                        name: u2.name,
                                                        mutual_count: 1,
                                                        mutual: [u.name],
                                                        score: 1
                                                });
                                        }
                                }
                        });
                }
        });
}