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  1. Core Server
  2. SERVER-19924

getLastError's n value now indicates the number of inserts completed.

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 3.1.7
    • Component/s: Write Ops
    • Labels:
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      In 3.0:

      > db.foo.drop();
> db.runCommand({insert: "foo", documents: [ { _id: 1} ]})
{ "ok" : 1, "n" : 1 }
> db.runCommand({getLastError: 1})
{
        "connectionId" : 1,
        "n" : 0,
        "syncMillis" : 0,
        "writtenTo" : null,
        "err" : null,
        "ok" : 1
}

      In 3.1:

      > db.foo.drop();
> db.runCommand({insert: "foo", documents: [ { _id: 1} ]})
{ "ok" : 1, "n" : 1 }
> db.runCommand({getLastError: 1})
{
        "connectionId" : 1,
        "n" : 1,
        "syncMillis" : 0,
        "writtenTo" : null,
        "err" : null,
        "ok" : 1
}
      Show
      In 3.0: > db.foo.drop(); > db.runCommand({insert: "foo" , documents: [ { _id: 1} ]}) { "ok" : 1, "n" : 1 } > db.runCommand({getLastError: 1}) { "connectionId" : 1, "n" : 0, "syncMillis" : 0, "writtenTo" : null , "err" : null , "ok" : 1 } In 3.1: > db.foo.drop(); > db.runCommand({insert: "foo" , documents: [ { _id: 1} ]}) { "ok" : 1, "n" : 1 } > db.runCommand({getLastError: 1}) { "connectionId" : 1, "n" : 1, "syncMillis" : 0, "writtenTo" : null , "err" : null , "ok" : 1 }

      getLastError used to return 0 for "n" after an insert. With the latest 3.1.7 nightly, it is now returning 1 (or presumably, the number of documents inserted).

      I certainly think this is the right value for "n" if we're starting from scratch, but at this point we shouldn't change this behavior as users may be relying on this.

            Assignee:
            david.storch@mongodb.com David Storch
            Reporter:
            craig.wilson@mongodb.com Craig Wilson
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              Created:
              Updated:
              Resolved: