Create a custom object referencing other objects - powershell

Question

I am trying to create a new custom object with data input from another object.
$clusters = Get-EMRClusters
$runningclusters = $clusters | Where-Object {
$_.Status.State -eq "Running" -or
$_.Status.State -eq "Waiting"
}
$runningclusters looks like
id name status
-- ---- ------
j-12345 cluster1 running
j-4567 cluster2 running
I want to create a new PSobject $o with a 4th column named PendingShutdown that's a boolean.
id name status pendingshutdown
-- ---- ------ ---------------
j-12345 cluster1 running False
j-4567 cluster2 running False
I have tried running this:
$o = New-Object PSObject
$o | Add-Member -NotePropertyName id -NotePropertyValue $runningclusters.id
$o | Add-Member -NotePropertyName name -NotePropertyValue $runningclusters.name
$o | Add-Member -NotePropertyName status -NotePropertyValue $runningclusters.status.state
$o | Add-Member -NotePropertyName PendingShutdown -NotePropertyValue $true
But my output for $o for the columns id and name are just objects themselves, not rows of IDs. How do I make an object to look like my desired object above?

Answer 1

You need to loop through each of the cluster-objects. You can loop through them and add the column to the current object, like:
$runningclusters = $clusters |
Where-Object {$_.Status.State -eq "Running" -or $_.Status.State -eq "Waiting"} |
Add-Member -NotePropertyName pendingshutdown -NotePropertyValue $true -PassThru
Or you could create new objects per cluster. Ex:
$MyNewClusterObjects = $runningclusters | ForEach-Object {
New-Object -TypeName psobject -Property #{
id = $_.id
name = $_.name
status = $_.status.state
PendingShutdown = $true
}
}

Answer 2

Simply use calculated properties for adding properties to objects in a pipeline, e.g. like this:
$runningclusters = $clusters | Where-Object {
$_.Status.State -eq "Running" -or
$_.Status.State -eq "Waiting"
} | Select-Object *,#{n='PendingShutdown';e={$false}}