如何调整MongoDB查询以按降序获取输出

Question

我正在使用转换为JSON的OSM文件。在此查询中，我正在尝试获取.json文件中所有设施的计数。我需要知道如何使输出反转。

查询： -

db.char.aggregate([{"$match":{"amenity":{"$exists":1}}}, {"$group":{"_id":"$amenity",
"count":{"$sum":1}}}, {"$sort":{"count":­1}}, {"$limit":100}])

电流输出： -

{ "_id" : "bar", "count" : 1 }
{ "_id" : "fitness_center", "count" : 1 }
{ "_id" : "fountain", "count" : 1 }
{ "_id" : "studio", "count" : 1 }
{ "_id" : "telephone", "count" : 1 }
{ "_id" : "nightclub", "count" : 1 }
{ "_id" : "shelter", "count" : 1 }
{ "_id" : "courthouse", "count" : 1 }
{ "_id" : "kindergarten", "count" : 1 }
{ "_id" : "doctors", "count" : 1 }
{ "_id" : "laboratory", "count" : 1 }
{ "_id" : "toilets", "count" : 2 }
{ "_id" : "community_centre", "count" : 2 }
{ "_id" : "embassy", "count" : 2 }
{ "_id" : "fire_station", "count" : 2 }
{ "_id" : "townhall", "count" : 2 }
{ "_id" : "prison", "count" : 2 }
{ "_id" : "clinic", "count" : 2 }
{ "_id" : "pub", "count" : 3 }
{ "_id" : "grave_yard", "count" : 3 }

Answer 1

<强> { “$排序”：{ “计数”： - 1}}

在排序部分应该做到你！