如何将嵌套 JSON 有效负载的最深层元素转换为 Power Query 中的单独行? [英] How can I turn the deepest elements of nested JSON payload into individual rows in Power Query?

问题描述

目标:我有一个 JSON 有效负载，格式如下:

Goal: I have a JSON payload with the following format:

    {
        "Values": [
        {
            "Details": {
                "14342": {
                    "2016-06-07T00:00:00": {
                        "Value": 99.62,
                        "Count": 7186
                    },
                    "2016-06-08T00:00:00": {
                        "Value": 99.73,
                        "Count": 7492
                    }
                },
                "14362": {
                    "2016-06-07T00:00:00": {
                        "Value": 97.55,
                        "Count": 1879
                    },
                    "2016-06-08T00:00:00": {
                        "Value": 92.68,
                        "Count": 355
                    }
                }
            },
            "Key": "query5570027",
            "Total": 0.0
        },
        {
           "Details": {
                "14342": {
                    "2016-06-07T00:00:00": {
                        "Value": 0.0,
                        "Count": 1018
                    },
                    "2016-06-08T00:00:00": {
                        "Value": 0.0,
                        "Count": 1227
                    }
                }
            },
            "Key": "query4004194",
            "Total": 0.0
        }
    ],
    "LatencyInMinute": 0.0
}

我想在 PowerBI 中加载它并生成如下表格:

I want to load this in PowerBI and produce a table like so:

请注意每个 Value + Count 对都有自己的行，并且一些元素是重复的.

Notice how each Value + Count pair has its own row and some elements are repeated.

问题:当我尝试在 Power BI 中执行此操作(通过 Power Query)时，我得到三个初始列，其中之一是详细信息.麻烦的是我可以展开详细信息，但我只是得到更多的列，我真正想要的是行.我尝试了转置、旋转列等，但没有任何帮助.Power Query 将嵌套数据元素视为列名，这加剧了我的麻烦.

Problem: When I try to do this in Power BI (via Power Query), I get three initial columns, one of which is Details. Trouble is that I can expand Details, but I just get more columns, where what I really want is rows. I tried transpose, pivoting columns, and such but nothing helped. My troubles are exacerbated by Power Query treating the nested data elements as column names.

问题:有没有办法在 M 中将此嵌套的 JSON 负载转换为我上面说明的表格示例?

Question: Is there a way, in M, to convert this nested JSON payload to the table example I illustrated above?

推荐答案

Chris Webb 编写了一个递归函数来扩展所有表类型的列 - 我已经成功地将它克隆为记录类型的列:

Chris Webb wrote a recursive function to expand all table-type columns - I've managed to clone it for record-type columns:

https://gist.github.com/Mike-Honey/0a252edf66c3c486b69b

这篇关于如何将嵌套 JSON 有效负载的最深层元素转换为 Power Query 中的单独行?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！