使用PowerShell嵌套JSON

Question

我的JSON看起来像这样：

{
  "data": [
    {
      "name": "engagement",
      "period": "lifetime",
      "values": [
        {
          "value": 52
        }
      ],
      "title": "Engagement",
      "description": "Total number of likes and comments on the media object",
      "id": "1798601712/insights/engagement/lifetime"
    },
    {
      "name": "impressions",
      "period": "lifetime",
      "values": [
        {
          "value": 796
        }
      ],
      "title": "Impressions",
      "description": "Total number of times the media object has been seen",
      "id": "1798601712/insights/impressions/lifetime"
    }
  ]
}

我目前设法实现的目标：

"1798601712/insights/engagement/lifetime","engagement","52"
"1798601712/insights/impressions/lifetime","impressions","796"
"1798601712/insights/reach/lifetime","reach","422"

使用以下代码：

$Ident = Import-Csv -Path ".\src\Process.txt" -Header $Header |
         Select-Object -Skip 2
foreach ($idka in $ident) {
    $sid = $idka.id
    $request_n = "https://api/"+ $sid +"/data=20190101&file=json"
    foreach($dane1 in $request_n) {
        Invoke-WebRequest $dane1 |
            ConvertFrom-Json |
            Select -ExpandProperty data |
            Select id, name, @{label = "values";Expression ={$_.values.value}} |
            Export-Csv $filename -NoTypeInformation -Append
    }
}

我需要我的csv看起来像这样：

id  engagement  impressions reach
1798601712  52  796 422
1786717942  34  428 346
1787997335  29  376 281
1788199840  30  532 439
1788311007  48  1053 867
1788353947  28  609 497
1788403484  43  809 460

Answer 1

扩展data数组组后，将按照您从id字段中提取的ID嵌套对象。 对于每个组，构建一个哈希表，您可以在其中将每个嵌套对象的值映射到它们的name属性。 从哈希表创建一个自定义对象，然后将结果导出到输出CSV。

...|
Select-Object -Expand data |
Group-Object { $_.id.Split('/')[0] } |
ForEach-Object {
    $prop = @{
        'id' = $_.Name
    }
    $_.Group | ForEach-Object {
        $prop[$_.name] = $_.values.value
    }
    New-Object -Type PSObject -Property $prop
} |
Select-Object id, engagement, impressions, reach |
Export-Csv $filename -NoType -Append

请注意，在PowerShell v3或更高版本中，您可以使用有序哈希表和[PSCustomObject]类型的加速器，而不是New-Object ，这将允许您省略最后一个Select-Object （其唯一目的是按所需顺序获取输出字段） ）。