command =
    group:
        ns: 'pings'
        cond:
            'ts': { $lt: new Date }
            'ip': 'some IP'
        key: { ip: true }
        initial: { count: 0 }
        $reduce: (doc, out) ->
            out.count++


# The executing part
mongoose.connection.db.executeDbCommand command, (err, docs) ->
            console.log docs.documents[0].retval