mongodb 針對某列值傳回list

Question

雷雷

Answer 1

mongodb 支援js語法，所以直接用map就可以了

// es6 
db.collection.find({}, {'name': 1}).map( x => x.name ) // [ "a", "b", "c" ]

db.collection.find({}, {'name': 1}).map(function(x) {return x.name} ) 

map介紹請看 https://danmartensen.svbtle.com/javascripts-map-reduce-and-filter#map_1