Forum Discussion

Copper Contributor

Feb 17, 2021

Solved

Set-PnPListItem - Multiple Managed Metadata Field

I need to update a Multivalued Managed Metadata field in a document library (sometimes resetting value as well), I'd like to use Set-PnPListItem to do this. Assuming $LibraryName and $Id are respect...

Joel Rodrigues
Feb 17, 2021
PHubaut did not try it, nor am I a super-efficient PowerShell developer, but could you try to:

-create a main array that will contain all your items

-for each object, add to the array. Not sure of you need to create an array with @(yourVal) inside the foreach for the object and append to the main array like: $mainArray = $mainArray + $itemArray?

Sorry of this does not help

PHubaut

Copper Contributor

Feb 17, 2021

Joel Rodrigues

Thanks Joel - I reshaped my tests based on your idea -
I am not a super-efficient PowerShell developer either and this may be the issue.
This works

# WORKS
$mainarray1 = @()
$mainarray1 = $mainarray1 + $mm1
$mainarray1 = $mainarray1 + $mm2
Set-PnPListItem -List $lib -Identity $Id -Values @{"Tags" = $mainarray1} # WORKS
# WORKS TOO
$mainarray2 = @()
foreach ($term in $mainarray1) {
    $mainarray2 = $mainarray2 + $term
}
Set-PnPListItem -List $lib -Identity $Id -Values @{"Tags" = $mainarray2} # WORKS

But this does not

$mainarray3 = @()
$mainarray1 | Foreach-Object -Process {$mainarray3 = $mainarray3 + $_}
Set-PnPListItem -List $lib -Identity $Id -Values @{"Tags" = $mainarray3} # FAILS

So the error is related to the "For Each"-way to add items to the array (statement or cmdlet).
Just for the record, after running above code, doing a $mainarray2.GetType(), $mainarray2[0].GetType(), $mainarray2[1].GetType() and same for $mainarray3 reveals exact same data types. Furthermore, $mainarray2[0].equals($mainarray3[0]) and $mainarray2[1].equals($mainarray3[1]) both returns True. I don't see the difference.

Thanks for the idea as I have a workaround !
...yet remaining with my doubts about what is going wrong.

James Love

Brass Contributor

Sep 27, 2022

PHubaut I just had the exact same thing as you - but I managed to get the "inline" method (with the Foreach-Object) working when I called .ToString() on my term.

 $properties = @{}
  foreach ($propertyName in $metadataFields) {
    $value = $targetFileItem[$propertyName]
    if ($value.GetType().Name -eq "TaxonomyFieldValue") {
      $value = $value.TermGuid
    }

    if ($value.GetType().Name -eq "TaxonomyFieldValueCollection") {
      $termArray = @()
      $value | Select-Object -ExpandProperty TermGuid | ForEach-Object { $termArray = $termArray + $_.ToString()}
      $value = $termArray
    }

    $properties.Add($propertyName, $value)
  }

PHubaut
Copper Contributor
Sep 27, 2022
Hi James Love, thanks for the trick. I do not have the environment required to test this but trust it is indeed a good solution. Thanks for the update as this scenario could happen to me (and to others too) in the future.