How to check if the id is in the array during the request?

Question

MongoDB

For example, there is a Room, Message and User model.

Schema Message = {
  title: { type: Schema.Types.String, require: true },
  room: { type: Schema.Types.ObjectId, ref: "User" },
  user: { type: Schema.Types.ObjectId, ref: "User" },
  hideForUsers: [{ type: Schema.Types.ObjectId, ref: "User" }],
}

MessageModel.find({ room: roomId});
Here I find all messages by room ID.
During the request, I have a UserId, how to check if this UserId is in the hideForUsers array of the Message and if it exists then exclude this document for the final result.
I don't know if I'm doing it right. We need the functionality to delete messages from the room with the ability to delete your message for yourself or for all users in the room.
If I chose for myself, then I want to add my UserId to the hideForUsers array, and when requested, determine whether to show this message for me or not.

Answer 1

Not this?

MessageModel.find({ 
  room: roomId, 
  hideForUsers: { $nin: [ UserId ] }
})

to ensure uniqueness in the array there is $addToSet
https://docs.mongodb.com/manual/reference/operator...
$pull with conditions
https://docs.mongodb.com/manual/reference/operator...