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You can now limit the resulting elements in the array after you push. The new syntax is :

db.coll.update({...}, {$push: { $each:[<values>], $slice:-N, $sort:{...}}}

The initial implementation (see ~~SERVER-8069~~ for more) only supports negative slice (taking stuff from the end of the array).

Sorting is by embedded document fields and doesn't work any type which is not an embedded docs (in the array).

depends on

SERVER-6399 Refactor update() code

is depended on by

DOCS-932 Add documentation for fixed sized arrays

is related to

SERVER-8008 $push to sorted array

DOCS-874 Add New $push operator syntax

SERVER-1050 not allowed to $push and $pop to same field in same update

SERVER-2363 $push/$pushAll support for insertion at any position (top/bottom/ordinal)

related to

CSHARP-684 Add new features to Update builder for server 2.4

SERVER-8069 Support full $slice / $sort semantics in $push

SERVER-8746 $push w/ $sort: make $slice optional

(1 is related to, 3 related to)

Participants:: Alberto Lerner, auto, Auzzie Booth, bishwa shrestha, Colin Mollenhour, Dave Edelhart, Eliot Horowitz, Flavien, Geoffrey Gallaway, Ian White, Javier Ferrero, Jon Hoffman, Juliusz Gonera, Karoly Negyesi, Keith Branton, Kevin Ryan, Martin Lazarov, Paulo Lomanto, Pierre Dane, Richard Oliver, Scott Lowe, Stephan B, Suhail, Thomas, Victor Boivie, Xiang.Song