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Type:
Bug
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Resolution: Cannot Reproduce
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Priority:
Major - P3
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Affects Version/s: 2.6.3
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Component/s: Write Ops
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ALL
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3
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"nModified" should be 0 in the following case, but it's 1:
> db.collection.find()
{ "_id" : 1, "a" : 1 }
> db.runCommand({update: 'collection', updates: [{q: {_id: 1}, u: {_id: 1, a: 1}}]})
{ "ok" : 1, "nModified" : 1, "n" : 1 }
nModified is 0 as expected if:
- the update uses $set instead of a whole-document replace
- the _id is an ObjectId instead of an integer
- the query is on a field besides _id
The behavior is intermittent, as seen in this shell session:
> db.collection.find()
{ "_id" : 1, "a" : 1 }
> db.runCommand({update: 'collection', updates: [{q: {_id: 1}, u: {_id: 1, a: 1}}]})
{ "ok" : 1, "nModified" : 1, "n" : 1 }
> db.collection.drop()
true
> db.collection.insert({_id: 1, a: 1})
WriteResult({ "nInserted" : 1 })
> db.runCommand({update: 'collection', updates: [{q: {_id: 1}, u: {_id: 1, a: 1}}]})
{ "ok" : 1, "nModified" : 0, "n" : 1 }