Powershell JSON pipeline expand multiple values into one column csv - json

Question

I'm trying to automate some data pipelines with Powershell, but I'm kinda stuck with converting a JSON list to a single cell per row in a CSV file. Hope some of you can help me out.
The JSON I get looks like the following:
{"result": [
{
"uid": "1",
"EducationHistory": []
},
{
"uid": "2",
"EducationHistory": []
},
{
"uid": "3",
"EducationHistory": []
},
{
"uid": "4",
"EducationHistory": {
"10466632": {
"euid": 10466632,
"degree": "Highschool",
"educationLevel": null
},
"10466634": {
"euid": 10466634,
"degree": "Law",
"educationLevel": "batchelor"
},
"10466635": {
"euid": 10466635,
"degree": "Law",
"educationLevel": "master"
}
}
},
{
"uid": "5",
"EducationHistory": {
"10482462": {
"euid": 10482462,
"degree": "IT",
"educationLevel": "master"
}
}
}
]
}
What I want to do is collect the educationLevels per uid in one column. So something like this:
uid | educationLevel
----+------------------
1 |
2 |
3 |
4 | barchelor, master
5 | master
Normally I would like Expandproperty to get down to a lower level, but this doesn't work for this case because every EducationHistory entry is behind a euid for that specific entry. Expanding every single one of them like in the example below isn't workable because of the number of records.
So I think I need something of a loop, but I don't know how. Hope you can help me. First post here and a Powershell newbie, so I hope my question is clear. Please let me know if you need more info.
The code for one entry, as example:
$json = Get-content -raw -path C:\TEMP\File.json
(ConvertFrom-Json -InputObject $json).result |
Select-Object uid,
#Expand one of the entries:
#{Name = "Edu.Level";E={$_.EducationHistory | Select-Object -
expandproperty 10466632 |Select-Object -expandpropert degree }} |
Format-Table

Answer 1

$content = Get-Content .\test.json
$result = ($content | ConvertFrom-Json).result
$totalResult = #()
foreach($res in $result) {
$tempArray = #()
if($res.EducationHistory -ne $null) {
$properties = $res.EducationHistory | Get-Member -MemberType NoteProperty
foreach($property in $properties) {
$eduLevel = $res.EducationHistory.$($property.Name).educationLevel
if(![String]::IsNullOrEmpty($eduLevel)) {
$tempArray += $eduLevel
}
}
}
$totalResult += [PSCustomObject]#{
uid = $res.uid
educationLevel = $tempArray -join ", "
}
}
$totalResult
This will output desired result for the input you have provided.
The trickiest part is the value of EducationHistory property. You have to use Get-Member cmdlet (see Get-Help Get-Member) to get the properties of the current object in loop. Then using the name of the property to access the educationLevel.

Answer 2

Your first question, my first answer I believe :) Similar to the last answer. You need to jump through the hoop of finding the object names in EducationalHistory to reference them.
$json = (Get-content C:\TEMP\File.json | ConvertFrom-Json).result
$results = #()
foreach ( $u in $json)
{
foreach ( $h in $u.EducationHistory)
{
$results += $h.PSObject.properties.Name | ForEach-Object{new-object PSObject -property #{ uid=$u.uid; degree=$h.$_.degree}}
}
}
$results | ConvertTo-Csv | select -skip 1