如何在Power Query中将嵌套的JSON有效内容的最深层元素转换为单独的行？ [英] How can I turn the deepest elements of nested JSON payload into individual rows in Power Query?

问题描述

目标：
我有以下格式的JSON负载：

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：

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

注意每个值+计数对如何有自己的行和某些元素重复。

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

问题：当我尝试在Power BI（通过Power Query）中执行此操作时，我得到了三个初始列，其中之一是详细信息 。麻烦的是我可以展开Details，但是我只会得到更多的列，而我真正想要的是行。我尝试转置，旋转列，但没有任何帮助。 Power Query将嵌套的数据元素视为列名，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：在M中，有没有一种方法可以将此嵌套的JSON有效内容转换为我上面说明的表示例？

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-我已经设法将其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

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