Core Server
  1. Core Server
  2. SERVER-2769

Provide a way to find out if $addToSet caused a change to the list

    Details

    • Type: Improvement Improvement
    • Status: Closed Closed
    • Priority: Minor - P4 Minor - P4
    • Resolution: Duplicate
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Write Ops
    • Labels:
      None
    • Backport:
      No
    • # Replies:
      2
    • Last comment by Customer:
      false

      Description

      Using $addToSet there is no way to find if the add changed the list. I would have though that the updatedExisting field in getLastError would reflect if a change was made or not but it doesn't seem to do that.

      > db.set.insert(

      { set : ['1','2','3'], _id : "123" }

      );
      > db.set.update({_id:"123"},{"$addToSet":{ set: '4'}}); db.runCommand("getlasterror");

      { "err" : null, "updatedExisting" : true, "n" : 1, "ok" : 1 }

      > db.set.update({_id:"123"},{"$addToSet":{ set: '4'}}); db.runCommand("getlasterror");
      { "err" : null, "updatedExisting" : true, "n" : 1, "ok" : 1

      I'm not sure what the best option here is but it would be very useful to know.

        Issue Links

          Activity

          Hide
          Piyush Verma
          added a comment -

          The behaviour persists in Version 2.2.0 as well.
          Any plans on a fix for this one ?

          Show
          Piyush Verma
          added a comment - The behaviour persists in Version 2.2.0 as well. Any plans on a fix for this one ?
          Hide
          Eliot Horowitz
          added a comment -

          Consolidating to SERVER-3409 since it has the most votes.

          Show
          Eliot Horowitz
          added a comment - Consolidating to SERVER-3409 since it has the most votes.

            People

            • Votes:
              7 Vote for this issue
              Watchers:
              8 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:
                Days since reply:
                1 year, 24 weeks, 6 days ago
                Date of 1st Reply: