Understanding django channels persistant data

I am trying to grasp the concept of persistant data in django channels. I have searched the reference and other parts but didn't clear my confusion. I would really appreciate if you help me understand better.

consumers.py:

@channel_session  def ws_connect(message):      # Work out room name from path (ignore slashes)      room = message.content['path'].strip("/")      # Save room in session and add us to the group      message.channel_session['room'] = room      Group("chat-%s" % room).add(message.reply_channel)

Q.1 In the above line message.channel_session['room'], is the room another property of the message? Like it tells which session the message belongs to?

@channel_session  def ws_message(message):      Group("chat-%s" % message.channel_session['room']).send({          "text": message['text'],      })

Q2. In the line Group("chat-%s" % message.channel_session['room']).send({, why are we not using the room variable like in the ws_connect() function, but instead we are using the channels_session?

@channel_session  def ws_disconnect(message):      Group("chat-%s" % message.channel_session['room']).discard(message.reply_channel)

Q3. Same like above, why are we not using the room variable to discard from the group? Also is it not neccesary to remove the room from the session?

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