Add a new unique ObjectId to each document in collection - PeakU

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Add a new unique ObjectId to each document in collection

I have an existing collection users where the _id field is a string instead of an ObjectId.

Is there a query that can update all documents in the collection and add a unique ObjectId for each document to using a new field called UID?

over 4 years ago · Santiago Trujillo

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You can generate a new ObjectId using new ObjectId() in the shell.

db.users.find().forEach(function(doc){
    doc.UID = new ObjectId();
    db.users.save(doc);
})

over 4 years ago · Santiago Trujillo Report

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