probably minor bug..

foo:PRIMARY> db.test.find()

{ "_id" : ObjectId("4d5d9381352dd47f2e62f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f2f62f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f3062f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f3162f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f3262f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f3362f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f3462f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f3562f58a"), "a" : 3 } { "_id" : ObjectId("4d5d9381352dd47f3662f58a"), "a" : 3 }

foo:PRIMARY> db.test.findAndModify({query:

{a:3}

, fields: {_id: 0, a: 1}, remove: true })
Fri Feb 18 12:01:42 uncaught exception: findAndModifyFailed failed: "exception: assertion db/../bson/bsonobjbuilder.h:119"
foo:PRIMARY> db.test.findAndModify({query:

{a:3}

, fields:

{a: 1}

, remove: true })

{ "_id" : ObjectId("4d5d9381352dd47f2f62f58a"), "a" : 3 }