javascript - 需要帮助使用 lodash 来重组具有新结构的数组

Question

我有一个从 API 返回的示例数据，我试图将其重组为具有分组对象子数组的数组。来自 API 的原始数据如下所示:

[
    {
        "InsightId": 314,
        "Classification": "Advantage",
        "AttributeId": 14958,
        "InsightAttribute": "Implementation speed",
        "AttributeType": "Product Criterion"
    },
    {
        "InsightId": 314,
        "Classification": "Advantage",
        "AttributeId": 14976,
        "InsightAttribute": "Understanding your needs",
        "AttributeType": "Sales Criterion"
    },
    {
        "InsightId": 315,
        "Classification": "Disadvantage",
        "AttributeId": 17691,
        "InsightAttribute": "Poor alignment with needs",
        "AttributeType": "Product Criterion"
    }
]

我想按 InsightId 进行分组并使用以下三个属性创建一个对象:AttributeId、InsightAttribute、AttributeType。

最终数组采用以下形式:

[
    {
        "InsightId": 314,
        "Classification": "Advantage",
        "Attributes" : [
            {
                "AttributeId": 14958,
                "InsightAttribute": "Implementation speed",
                "AttributeType": "Product Criterion"
            },

            {
                AttributeId": 14976,
                "InsightAttribute": "Understanding your needs",
                "AttributeType": "Sales Criterion"
            }
        ]
    },
    {
        "InsightId": 315,
        "Classification": "Disadvantage",
        "Attributes" : [
            {
                "AttributeId": 17691,
                "InsightAttribute": "Poor alignment with needs",
                "AttributeType": "Product Criterion"
            }
        ]   
    }
]

我是 Lodash 的新手，我已经花了几个小时探索了一些尚未解决的兔子洞。我意识到是时候向专家求助了。关于如何获得上面显示的最终结果有什么建议吗？

感谢您的帮助!

Answer 1

您可以使用reduce()来循环并构建新的响应:

  _.values( _.reduce([{
    "InsightId": 314,
    "Classification": "Advantage",
    "AttributeId": 14958,
    "InsightAttribute": "Implementation speed",
    "AttributeType": "Product Criterion"
  }, {
    "InsightId": 314,
    "Classification": "Advantage",
    "AttributeId": 14976,
    "InsightAttribute": "Understanding your needs",
    "AttributeType": "Sales Criterion"
  }, {
    "InsightId": 315,
    "Classification": "Disadvantage",
    "AttributeId": 17691,
    "InsightAttribute": "Poor alignment with needs",
    "AttributeType": "Product Criterion"
  }], function(a, b) {

    // create a new array for common items under InsightId:
    var temp=a[b.InsightId] = a[b.InsightId] || {
        InsightId: b.InsightId,
        Classification: b.Classification,
        Attributes: []
    };

    // push current attribs into collection under InsightId:
    temp.Attributes.push({
        AttributeId: b.AttributeId,
        InsightAttribute: b.InsightAttribute,
        AttributeType: b.AttributeType
    });
    return a;
  }, {}));

返回:

[
    {
        "InsightId": 314,
        "Classification": "Advantage",
        "Attributes": [
            {
                "AttributeId": 14958,
                "InsightAttribute": "Implementation speed",
                "AttributeType": "Product Criterion"
            },
            {
                "AttributeId": 14976,
                "InsightAttribute": "Understanding your needs",
                "AttributeType": "Sales Criterion"
            }
        ]
    },
    {
        "InsightId": 315,
        "Classification": "Disadvantage",
        "Attributes": [
            {
                "AttributeId": 17691,
                "InsightAttribute": "Poor alignment with needs",
                "AttributeType": "Product Criterion"
            }
        ]
    }
]

可能有一种稍微简单的方法来收集属性，但只有 3 个键，硬编码并不太麻烦。