[Solved] What is wrong with this code snippet?@socketio.on('message') def handle_message(data): room = data['room'] emit('message', data['msg']) join_room(room) | Flask

Flask - WebSocket and Real-Time

What is wrong with this code snippet?

@socketio.on('message')
def handle_message(data):
    room = data['room']
    emit('message', data['msg'])
    join_room(room)

Ajoin_room should be called before emit to send message to the room

Bjoin_room cannot be called inside event handlers

Cdata['msg'] is not a valid key

Demit is missing the room parameter to send message to the room

Step-by-Step Solution

Solution:

Step 1: Check emit call
emit sends message but lacks room=room, so message goes to sender only.
Step 2: Understand join_room timing
join_room after emit does not affect this emit call.
Final Answer:
emit is missing the room parameter to send message to the room -> Option D
Quick Check:
emit needs room= to target room [OK]

Quick Trick: Add room= to emit to send to room [OK]

Common Mistakes:

MISTAKES

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What is wrong with this code snippet?