Clean way to subscribe to a filtered set of events about socketio HOT 3 CLOSED

This is exactly what event filters are for. Primus and other (potential) real-time providers don't have a concept of rooms and everything that rooms can do - and more complex functionality (which you almost always need) - can also be done through event filters. There are two options:

1. Add the rooms a user is in to the user object and compare the messages room to the rooms the user is subscribed to. This is usually the best way since you can e.g. show offline users that joined a room (which isn't easily possible with Socket.io rooms)
2. Add a custom Socket.io join event and add the connected room directly to the connection and then filter by the rooms on that connection:

app.use(socketio(function(io) {
  io.on('connection', function(socket) {
    socket.on('join', function(roomId) {
      socket.feathers.rooms.push(roomId);
    });
  });
}));

app.service('messages').filter(function(data, connection) {
  return connection.rooms.indexOf(data.room) !== -1;
});

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Yup. That will do it! I'm going to close but this has come up a few times I'm wondering if we should put it in as an example in the docs under "rooms" or "channels". I dunno... maybe people just aren't seeing the that part of the docs too....

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I added it to the FAQ at http://docs.feathersjs.com/help/faq.html#how-do-i-create-channels-or-rooms

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