Unexpected behavior in function processing PowerShell pipeline - powershell

Question

I created a function to process items I want from an object and sort them into a new PSCustomObject. If I pass the object through the pipeline I get some duplicated and odd results versus passing the object as a parameter into the function and using a ForEach-Object loop.
Here is my example (this would produce 3 records):
$audioSessions | Where-Object {$_.QoeReport.FeedbackReports}
Versus this (which produces six and some are duplicated:
$audioSessions | Where-Object {$_.QoeReport.FeedbackReports} | ProcessFeedback
Here is the difference in the output:
Any idea why this would be happening? There are 3 objects I'm passing to the ProcessFeedback function, no? Why are some items duplicated and some are not?
If I choose to pass the entire variable into the function and loop within it, I get the 3 objects back from my function as expected:
ProcessFeedback -feedbackInput $audioSessions
Then, inside my function I do the filter with the Where-Object statement resulting in something like this:
function ProcessFeedback{
[cmdletbinding()]
Param(
[Parameter(mandatory=$true, valuefrompipeline=$true)]
$feedbackInput
)
begin{}
process{
$feedbackInput | Where-Object {$_.QoeReport.FeedbackReports} | ForEach-Object{
[array]$newObject += [PSCustomObject][ordered]#{
FromUri = $_.FromUri
ToUri = $_.ToUri
CaptureTime = $_.QoeReport.FeedbackReports.CaptureTime
Rating = $_.QoeReport.FeedBackReports.Rating
}
}
return $newObject
}
}
NOTE: When I pass the object through the pipeline, I remove the Where-Object statement in the ProcessFeedback function as I only ever see one object passed to it at a time.

Answer 1

Okay so I think I figured this out...
If you're passing multiple objects through the pipeline, there is no need to add the results together.
I simply changed the code to remove the [array] and += values from $newObject as follows:
function ProcessFeedback{
begin{}
process{
$newObject = [PSCustomObject][ordered]#{
FromUri = $_.FromUri
ToUri = $_.ToUri
CaptureTime = $_.QoeReport.FeedbackReports.CaptureTime
Rating = $_.QoeReport.FeedBackReports.Rating
}
}
return $newObject
}
}
Then run it like this:
[array]$arrFeedbackResults += $audioSessions | Where-Object {$_.QoeReport.FeedbackReports} | ProcessFeedback
I also removed the input parameter from the function as the object is passed through the pipeline anyway.