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  1. Go Driver
  2. GODRIVER-1978

Document that _id should be the first field in a Document

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    • Icon: Improvement Improvement
    • Resolution: Unresolved
    • Icon: Minor - P4 Minor - P4
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    Description

      For performance reasons, the server recommends that the _id field in any inserted Document be the first one. transformAndEnsureID() used to move the _id field of any document to be first, but as of GODRIVER-1180, it no longer does.

      We'd like to avoid changing the order of a Document that the user has created, but we should document that putting _id in any position but the first in an ordered Document insertion can potentially cause a loss in performance.

      Additionally, we should document that if users do not specify an _id in a bson.D, one will be added for them and added first. Finally, we should mention that there's no way to guarantee the position of a manually-added _id field in a bson.M.

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            Unassigned Unassigned
            benji.rewis@mongodb.com Benji Rewis (Inactive)
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              Updated: