javascript - GroupBy 使用 underscore.js 使用嵌套 JSON 对象

Question

我尝试使用 category 的 BroadCategory 属性对此 JSON 进行分组

[{
"brand": "Brand3",
"category": {
    "popularity_index": 7,
    "BroadCategory ": "BroadCategory4",
    "MainCategory": "MainCategory410",
    "GeneralCategory": "GeneralCategory41"
},
"description": "colonialism",
"discount": 17,
"id": 9
}, {
"brand": "Brand2",
"category": {
    "popularity_index": 5,
    "BroadCategory ": "BroadCategory2",
    "MainCategory": "MainCategory210",
    "GeneralCategory": "GeneralCategory21"
},
"description": "desc2",
"discount": 15,
"id": 2
}]

我浏览了underscore.js - _.groupBy nested attribute但这在 JSON 中有用于 location

的数组

我尝试过类似的方法:

var grpArray = _.groupBy(products, function (element) {
   return element.category.BroadCategory;
})

但它不起作用。为什么我无法访问 BroadCategory ？

Answer 1

您必须 trim 空格“BroadCategory”

"BroadCategory ": "BroadCategory2",

更改为:

"BroadCategory": "BroadCategory2",

或者:

_.groupBy(products, function (element) {
   return element.category['BroadCategory '];
})