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Type: Bug
Resolution: Done
Priority: Major - P3
Fix Version/s: None
Affects Version/s: 2.2.0
Component/s: Querying, Write Ops
Labels:
None
Environment:
FreeBSD 7.3-RELEASE FreeBSD 7.3-RELEASE root@:/usr/src/sys/amd64/compile/GENERIC amd64
db version v2.2.0, pdfile version 4.5

Operating System:
FreeBSD
Steps To Reproduce:

Hide

> db.bobo.save(
{a:1, b:2, c:3, d:4}
)
> db.bobo.find()
{ "_id" : ObjectId("5100b05af1c2c68819360d1a"), "a" : 1, "b" : 2, "c" : 3, "d" : 4 }
> db.bobo.update(
{a:1, b:2}
, {$unset:{c:1, d:1}})
> db.getLastErrorCmd()
{
"n" : 0, // <------- it expected to be `1`
"lastOp" :
{ "t" : 1358999706000, "i" : 1 }
,
"connectionId" : 131,
"err" : null,
"ok" : 1
}
> db.bobo.find(
{a:1, b:2}
)
{ "_id" : ObjectId("5100b05af1c2c68819360d1a"), "a" : 1, "b" : 2 }
> db.bobo.update(
{a:1}
, {$unset:{b:1}})
> db.getLastErrorCmd()
{
"updatedExisting" : true,
"n" : 1,
"lastOp" :
{ "t" : 1358999741000, "i" : 2 }
,
"connectionId" : 131,
"err" : null,
"ok" : 1
}

Show
> db.bobo.save( {a:1, b:2, c:3, d:4} ) > db.bobo.find() { "_id" : ObjectId("5100b05af1c2c68819360d1a"), "a" : 1, "b" : 2, "c" : 3, "d" : 4 } > db.bobo.update( {a:1, b:2} , {$unset:{c:1, d:1}}) > db.getLastErrorCmd() { "n" : 0, // <------- it expected to be `1` "lastOp" : { "t" : 1358999706000, "i" : 1 } , "connectionId" : 131, "err" : null, "ok" : 1 } > db.bobo.find( {a:1, b:2} ) { "_id" : ObjectId("5100b05af1c2c68819360d1a"), "a" : 1, "b" : 2 } > db.bobo.update( {a:1} , {$unset:{b:1}}) > db.getLastErrorCmd() { "updatedExisting" : true, "n" : 1, "lastOp" : { "t" : 1358999741000, "i" : 2 } , "connectionId" : 131, "err" : null, "ok" : 1 }
Confidence Status:
None
Work Order:
3
CAR Domain/s:
None

After updating and unsetting a field, we get result by db.getLastErrorCmd().
we found strange `n' value returned.
see below: