//wrong order
db.games.find().sort(

{'decks.points': -1}

);
{ "_id" : "game-20101124-185512-c86779ce.html", "decks" : [

{ "points" : 64 }

,

{ "points" : 42 }

] }
{ "_id" : "game-20101124-171239-da3d89e2.html", "decks" : [

{ "points" : 63 }

,

{ "points" : 33 }

] }
{ "_id" : "game-20101124-204302-026f72ee.html", "decks" : [

{ "points" : 43 }

,

{ "points" : 36 }

,

{ "points" : 28 }

] }
{ "_id" : "game-20101124-083714-3cc1743c.html", "decks" : [

{ "points" : 47 }

,

{ "points" : 42 }

] }
{ "_id" : "game-20101124-013048-26973e9a.html", "decks" : [

{ "points" : 47 }

,

{ "points" : 29 }

] }

db.games.ensureIndex(

{"decks.points": -1}

)

//correct order
db.games.find().sort(

{'decks.points': -1}

);
{ "_id" : "game-20101124-185512-c86779ce.html", "decks" : [

{ "points" : 64 }

,

{ "points" : 42 }

] }
{ "_id" : "game-20101124-171239-da3d89e2.html", "decks" : [

{ "points" : 63 }

,

{ "points" : 33 }

] }
{ "_id" : "game-20101124-083714-3cc1743c.html", "decks" : [

{ "points" : 47 }

,

{ "points" : 42 }

] }
{ "_id" : "game-20101124-013048-26973e9a.html", "decks" : [

{ "points" : 47 }

,

{ "points" : 29 }

] }
{ "_id" : "game-20101124-204302-026f72ee.html", "decks" : [

{ "points" : 43 }

,

{ "points" : 36 }

,

{ "points" : 28 }

] }
> db.decks.dropIndex(

{'decks.points':-1}