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Type:
Bug
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Resolution: Done
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Priority:
Minor - P4
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None
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Affects Version/s: None
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Component/s: Write Ops
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None
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ALL
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3
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update, find, and $slice don't agree about what negative integers mean: $slice treats negatives as offsets from the right end of the array, find doesn't (seem to) support them at all, and update does something weird:
db.a.insert({ x : [] });
db.a.update({}, { $set : { "x.-1" : 1 } } );
db.a.update({}, { $set : { "x.-1" : 2 } } );
db.a.update({}, { $set : { "x.-1" : 3 } } );
db.a.find()
{ "_id" : ObjectId("4f849706fdbf7f54d34ba15b"), "x" : [ 3, 2, 1 ] }
db.a.find({}, { x: { $slice : -1 } })
{ "_id" : ObjectId("4f849706fdbf7f54d34ba15b"), "x" : [ 1 ] }
db.a.find({ "x.-1" : 1 });
I didn't check what aggregation framework operators do...