Emitting to single room when socket was joined via socket.join([rooms]) doesn't emit.

[andrewgrewell]

You want to:

• report a bug

Current behaviour

Doing io.in(roomA).emit(...) will not emit to that room if the socket was joined via socket.join([roomA, roomB, ...])

Steps to reproduce

see: fiddle to reproduce
example:

io.on('connect', (socket) => {
  console.log('client connected to root, socket id: ' + socket.id);

  socket.on('disconnect', () => console.log('client disconnected from root, socket id: ' + socket.id));

  var rooms = ['a', 'b', 'c'];
  socket.join(rooms, (err) => {

    // respond with the status of the joins
    socket.emit('joined-rooms', {
      status: err ? 'success' : 'failure',
      error: err,
      message: `${err ? 'failed to join' : 'joined'} rooms: a, b, c`
    });


    // send a message to each single room that we joined - this seems to fail
    rooms.forEach((room) => {
      console.log('emitting message to room', room);
      io.in(room).emit('message', {
        multiRoom: false,
        message: `this message was sent to a single room '${room}'`
      });
    });


    // send a message to all rooms that we joined - this will work
    console.log('emitting message to all rooms', rooms);
    io.in(rooms).emit('message', {
      multiRoom: true,
      message: `this message was sent to rooms '${rooms}'`
    });
  });
});

Expected behaviour

I would expect to be able to do socket.join([...multipleRooms]) and later io.in(singleRoom).emit(...)

Setup

• socket.io version: 1.7.3 (both client and server)

Solution

For now I am just doing rooms.forEach(room => socket.join(room) and then I am able to emit to a single room

[darrachequesne]

That feature was recently added (#2879), and is not released yet.

[andrewgrewell]

Gotcha, thanks