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Hello and thanks for taking the time to help out. I am trying to find a mongoDB document that has an array.

The array is a list of IDs of users who have read the chat message.

I want to be able to find and/or count the docuemnts that do NOT contain the id of a specified user. That way I can tell who has or has not read the message.

Any pointers in the right direction are appreciated!

I know how to find a document that has an array that contains a value.... but I do not know how to find a document that has an array that does NOT contain a value.

let chatsUnread = await Chat.find({
    chatRoom: rooms[i],
    readMessage: { $all: [!userId] },
  });

Thanks!

Improve this question
3
  • Please add sample data and expected output also will be east if you can create mongoplayground.net Commented Mar 26, 2021 at 23:54
  • You probably need $not $elemMatc, like described at (stackoverflow.com/questions/45567107/…) Commented Mar 27, 2021 at 1:32
  • Please share the schema structure, so that we can construct the query. Commented Mar 27, 2021 at 8:35
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