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mongodb

How to set a primary key in MongoDB?

I want to set one of my fields as primary key. I am using MongoDB as my NoSQL.

Solution

  • _id field is reserved for primary key in mongodb, and that should be a unique value. If you don't set anything to _id it will automatically fill it with "MongoDB Id Object". But you can put any unique info into that field.

    Additional info: http://www.mongodb.org/display/DOCS/BSON

    Hope it helps.