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Description
The logic for posting a new message was not properly updating state. I updated it so rather than mutating the current data, state is now updated when a message is created.
I added a
seen
property to the Message schema, to indicate unread messages.I also added a useEffect to update messages in conversations as read when the conversation is opened.
Notes on your approach and thought process
I could tell that the initial bugs were state related because the correct values would appear after a refresh. I've personally seen this issue within React many times.
I also implemented a bulk update for reading messages based on if a conversation is opened. If a conversation is opened, all the messages are read.