Report both the number of documents ("n") which were matched and have the expected updated values, and the number of docs which were actually changed with a write to the database ("nDocsModified").
Expected:
> db.rb.save({_id:3, a:[1,2]})
Updated 1 existing record(s) in 6ms
Update WriteResult({ "ok" : 1, "nDocsModified" : 1, "n" : 1 ... })
// No-op doesn't require modifying the document
> db.rb.save({_id:3, a:[1,2]})
Updated 1 existing record(s) in 2ms
Update WriteResult({ "ok" : 1, "nDocsModified" : 0, "n" : 1 ... })
Note: These changes only apply to the new write commands, not the old wire protocol updates. This means you must be using a new driver/client to see this field in the WriteResults.
Old Description
db.foo.save(
)
db.foo.update(
, {$addToSet:
{ n: 'foo' }} )
db.getPrevError();
{ "err" : null, "updatedExisting" : true, "n" : 1, "nPrev" : 1, "ok" : 1 }updatedExisting should be false in this case, since the document was not, in fact, updated.
- is depended on by
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SERVER-18639 Expose number of modified documents in getLastError output
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- Closed
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- is duplicated by
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SERVER-8422 Log/getLastError/profile output reports nupdated:1 even if no change
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- Closed
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- Closed
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- related to
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SERVER-9038 New write operation method for insert, update, remove
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- Closed
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- Closed
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