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  1. Core Server
  2. SERVER-54687

`$pull`ed index should not override query-matched index for `$(update)`

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    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 4.2.12
    • Component/s: Querying
    • Labels:
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      Run the following in a collection `testCol`.

      db.testCol.insertOne({
 _id: "TEST",
 toPull: ["A", "B", "C", "D", "E"],
 toSet: [
  {id: "E"},
  {id: "D"},
  {id: "C"},
  {id: "B"},
  {id: "A"},
 ]
});

      db.testCol.updateOne({
 _id: "TEST",
 toPull: "B",
 toSet: {$elemMatch: {id: "B"}}
}, {
 $set: { "toSet.$.data": "Z" },
 $pull: { toPull: "B" },
});

      db.testCol.findOne({_id: "TEST"});
      Show
      Run the following in a collection `testCol`. db.testCol.insertOne({ _id: "TEST" , toPull: [ "A" , "B" , "C" , "D" , "E" ], toSet: [ {id: "E" }, {id: "D" }, {id: "C" }, {id: "B" }, {id: "A" }, ] }); db.testCol.updateOne({ _id: "TEST" , toPull: "B" , toSet: {$elemMatch: {id: "B" }} }, { $set: { "toSet.$.data" : "Z" }, $pull: { toPull: "B" }, }); db.testCol.findOne({_id: "TEST" });

      The index of `$pull`ed element in an unrelated field becomes `$(update)` when `$set`ting another field. See steps to reproduce. Expected result is to set `{data: "Z"}` on the forth element, but it actually set it on the second element, due to pulling the second element of another unrelated field.

        1. Screenshot 2021-02-21 232554.png
          39 kB
          TimTIM Wong

            Assignee:
            edwin.zhou@mongodb.com Edwin Zhou
            Reporter:
            wegylexy@gmail.com TimTIM Wong
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              Created:
              Updated:
              Resolved: