Should I use string or objectid for non-primary key IDs in mongodb?

Question

{
    _id:ObjectId,
    otherID:String
}

{
    _id:ObjectId,
    OtherID:ObjectId
}

What’s the difference?

Answer 1

Please use ObjectId, various operations are more convenient than strings

Answer 2

I have made a more comprehensive explanation about ObjectId, you can refer to the article.
If you don’t want to read it all, the answer to this question is in the Q&A section at the end.

Answer 3

ObjectId is easier to generate in a sharded environment... and the default _id key is an ObjectId object..