Powershell nested json to repeating csv - json

Question

Kind of similar to Convert nested JSON array into separate columns in CSV file but instead of flattened csv (ie discipline_01, discicpline_01) exporting to multiple lines of the csv:
{
"data": [{
"attributes": {
"id": 10011,
"title": "Test procedure",
"slug": "slug",
"url": "http://test.test",
"disciplines": [
"discipline_a",
"discipline_b",
"discipline_c"
]
}
}]
}
export to
"id","title","slug","url","discipline"
"10011","Test procedure","slug","http://test.test","discipline_a"
"10011","Test procedure","slug","http://test.test","discipline_b"
"10011","Test procedure","slug","http://test.test","discipline_c"
Thanks to Export fields with nested values from JSON to CSV I've gotten this far:
$foo = invoke-restmethod $restquery -headers $headers
$foo |
select -ExpandProperty data |
select -ExpandProperty attributes |
select id, title, slug, url, disciplines |
foreach {
$_.disciplines = $_disciplines -join ' '
$_ |
export-csv c:\outfile.csv -notypeinformation
This gives me
"10011","Test procedure","slug","http://test.test","discipline_a discipline_b discipline_c"
But no clue how to get it to:
"id","title","slug","url","discipline"
"10011","Test procedure","slug","http://test.test","discipline_a"
"10011","Test procedure","slug","http://test.test","discipline_b"
"10011","Test procedure","slug","http://test.test","discipline_c"
Any help is appreciated.

Answer 1

While your posted Json is invalid,
this might do:
## Q:\Test\2019\05\31\SO_56401395.ps1
$foo = invoke-restmethod $restquery -headers $headers
$Data = $foo.data.attributes | ForEach-Object {
foreach ($discipline in $_.disciplines}(
[PSCustomObject]#{
id = $_.id
title = $_.title
slug = $_.slug
url = $_.url
discipline = $discipline
}
}
}
$Data | Export-Csv c:\outfile.csv -NoTypeInformation