使用 Power BI / Power Query / M 代码将 JSON 响应列表数组解析为列而不是行

Question

我一直在尝试使用 Power BI / Power Query / M 代码转换 JSON 文件。

我想将我的示例 JSON 数据（如下提供）解析为如下表格格式：

到目前为止我的 Power BI / Power Query / M 代码

let
    Source = Json.Document(File.Contents("C:\demo.json")),
    #"Converted to Table" = Record.ToTable(Source),
    #"Expanded Value" = Table.ExpandListColumn(#"Converted to Table", "Value"),
    #"Expanded Value1" = Table.ExpandRecordColumn(#"Expanded Value", "Value", {"ReportID", "ReportName", "ReportType", "ReportTitles", "ReportDate", "UpdatedDateUTC", "Rows"}, {"ReportID", "ReportName", "ReportType", "ReportTitles", "ReportDate", "UpdatedDateUTC", "Rows"}),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded Value1",{"Name", "ReportID", "ReportName", "ReportType", "ReportTitles", "ReportDate", "UpdatedDateUTC"}),
    #"Expanded Rows" = Table.ExpandListColumn(#"Removed Columns", "Rows"),
    #"Expanded Rows1" = Table.ExpandRecordColumn(#"Expanded Rows", "Rows", {"RowType", "Cells", "Title", "Rows"}, {"RowType", "Cells", "Title", "Rows.1"})
in
    #"Expanded Rows1"

我的代码达到了这样一个点：查询结果有一行用于标题内容，一行用于两个部分的内容。

我被困在如何将 JSON 数组列表扩展为列而不是行？具体来说：

• List 在Header 行Cells 列
• List 在两个Section 行Rows.1 列中

任何提示、提示、想法、指针？

示例 JSON 文件

{
  "Reports": [
    {
      "ReportID": "ProfitAndLoss",
      "ReportName": "Profit and Loss",
      "ReportType": "ProfitAndLoss",
      "ReportTitles": [
        "Profit & Loss",
        "Demo Company (AU)",
        "1 February 2018 to 28 February 2018"
      ],
      "ReportDate": "25 February 2018",
      "UpdatedDateUTC": "\/Date(1519593468971)\/",
      "Rows": [
        {
          "RowType": "Header",
          "Cells": [
            { "Value": "" },
            { "Value": "28 Feb 18" },
            { "Value": "28 Jan 18" }
          ]
        },
        {
          "RowType": "Section",
          "Title": " Income",
          "Rows": [
            {
              "RowType": "Row",
              "Cells": [
                {
                  "Value": "Sales",
                  "Attributes": [
                    {
                      "Value": "e2bacdc6-2006-43c2-a5da-3c0e5f43b452",
                      "Id": "account"
                    }
                  ]
                },{
                  "Value": "9220.05",
                  "Attributes": [
                    {
                      "Value": "e2bacdc6-2006-43c2-a5da-3c0e5f43b452",
                      "Id": "account"
                    }
                  ]
                },{
                  "Value": "5120.05",
                  "Attributes": [
                    {
                      "Value": "e2bacdc6-2006-43c2-a5da-3c0e5f43b452",
                      "Id": "account"
                    }
                  ]
                }
              ]
            },
            {
              "RowType": "SummaryRow",
              "Cells": [
                { "Value": "Total Income" },
                { "Value": "9220.05" },
                { "Value": "1250.09" }
              ]
            }
          ]
        },{
          "RowType": "Section",
          "Rows": [
            {
              "RowType": "Row",
              "Cells": [
                { "Value": "NET PROFIT" },
                { "Value": "-6250.09" },
                { "Value": "-7250.09" }
              ]
            }
          ]
        }
      ]
    }
  ]
}

Answer 1

可能有更好的方法，但这是我想出的：

let
    Source = Json.Document(File.Contents("document.json")),
    #"Converted to Table" = Record.ToTable(Source),
    #"Expanded Value" = Table.ExpandListColumn(#"Converted to Table", "Value"),
    #"Expanded Value1" = Table.ExpandRecordColumn(#"Expanded Value", "Value", {"ReportID", "ReportName", "ReportType", "ReportTitles", "ReportDate", "UpdatedDateUTC", "Rows"}, {"ReportID", "ReportName", "ReportType", "ReportTitles", "ReportDate", "UpdatedDateUTC", "Rows"}),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded Value1",{"Name", "ReportID", "ReportName", "ReportType", "ReportTitles", "ReportDate", "UpdatedDateUTC"}),
    #"Expanded Rows" = Table.ExpandListColumn(#"Removed Columns", "Rows"),
    #"Expanded Rows1" = Table.ExpandRecordColumn(#"Expanded Rows", "Rows", {"RowType", "Cells", "Title", "Rows"}, {"RowType", "Cells", "Title", "Rows.1"}),
    //Get the headers
    #"HeaderRaw" = #"Expanded Rows1"{0}[Cells],
    #"Converted to Table1" = Table.FromList(HeaderRaw, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Expanded Column1" = Table.ExpandRecordColumn(#"Converted to Table1", "Column1", {"Value"}, {"Column1.Value"}),
    #"Added Index" = Table.AddIndexColumn(#"Expanded Column1", "Index", 1, 1, Int64.Type),
    #"Changed Type" = Table.TransformColumnTypes(#"Added Index",{{"Index", type text}}),
    #"Replaced Value" = Table.ReplaceValue(#"Changed Type","","blank",Replacer.ReplaceValue,{"Column1.Value"}),
    oldColumnNames = Table.Column(#"Replaced Value", "Index"),
    newColumnNames = Table.Column(#"Replaced Value", "Column1.Value"),
    #"RenameRecords" = List.Zip({oldColumnNames, newColumnNames}),
    //Get contents
    #"Removed Top Rows" = Table.Skip(#"Expanded Rows1",1),
    #"combine" = Table.SelectColumns(#"Removed Top Rows",{"RowType", "Title", "Rows.1"}),
    #"Expanded Rows.2" = Table.ExpandListColumn(combine, "Rows.1"),
    #"Expanded Rows.1" = Table.ExpandRecordColumn(#"Expanded Rows.2", "Rows.1", {"RowType", "Cells"}, {"Rows.1.RowType", "Rows.1.Cells"}),
    #"Expanded Rows.1.Cells" = Table.ExpandListColumn(#"Expanded Rows.1", "Rows.1.Cells"),
    #"Grouped Rows" = Table.Group(#"Expanded Rows.1.Cells", {"Title", "Rows.1.RowType"}, {{"Count", each _, type table [RowType=text, Title=nullable text, Rows.1.RowType=text, Rows.1.Cells=record]}}),
    #"Added Custom" = Table.AddColumn(#"Grouped Rows", "Custom", each Table.AddIndexColumn([Count], "Index", 1)),
    #"Removed Other Columns" = Table.SelectColumns(#"Added Custom",{"Custom"}),
    #"Expanded Custom" = Table.ExpandTableColumn(#"Removed Other Columns", "Custom", {"RowType", "Title", "Rows.1.RowType", "Rows.1.Cells", "Index"}, {"Custom.RowType", "Custom.Title", "Custom.Rows.1.RowType", "Custom.Rows.1.Cells", "Custom.Index"}),
    #"Expanded Custom.Rows.1.Cells" = Table.ExpandRecordColumn(#"Expanded Custom", "Custom.Rows.1.Cells", {"Value", "Attributes"}, {"Custom.Rows.1.Cells.Value", "Custom.Rows.1.Cells.Attributes"}),
    #"Removed Columns1" = Table.RemoveColumns(#"Expanded Custom.Rows.1.Cells",{"Custom.Rows.1.Cells.Attributes"}),
    #"Pivoted Column" = Table.Pivot(Table.TransformColumnTypes(#"Removed Columns1", {{"Custom.Index", type text}}, "en-GB"), List.Distinct(Table.TransformColumnTypes(#"Removed Columns1", {{"Custom.Index", type text}}, "en-GB")[Custom.Index]), "Custom.Index", "Custom.Rows.1.Cells.Value"),
    #"Final" = Table.RenameColumns(#"Pivoted Column", #"RenameRecords")
in
    #"Final"

1. 获取标题记录和值，添加索引并将其转换为“旧列名”和“新列名”（您将获得 1 - 空白，2 月 2 日 - 28 日，1 月 3 日 - 28 日）

2. 获取剩余的记录并将它们全部展开，然后按类型分组并添加索引，这样您将得到类似：总收入 - 1, 9220.5 - 2, 1250.5 - 3

3. 然后在索引列上旋转表格，使用单元格的值，这会将值放入列中，列将被称为 1,2 和 3

4. 最后根据我们在步骤 1 中所做的重命名列