Maybe I haven't explained it very well in the title, so here's an example

foreach ( $csv in $csvs )
{
Echo "Processing Cluster Shared Volume $n"
$Signature = ( $csv | Get-ClusterParameter DiskSignature ).Value.substring(2)

$obj = New-Object PSObject -Property @{
Name = $csv.Name
CSVPath = ( $csv | select -Property Name -ExpandProperty SharedVolumeInfo).FriendlyVolumeName
LUN = ( Get-WmiObject Win32_DiskDrive | Where { "{0:x}" -f $_.Signature -eq $Signature } ).SCSILogicalUnit
PhysicalDisk = ( Get-WmiObject Win32_DiskDrive | Where { "{0:x}" -f $_.Signature -eq $Signature } ).DeviceID.substring(4)
}
($obj).PhysicalDisk = ($obj).PhysicalDisk -Replace "PHYSICALDRIVE", "Physical Disk "
$objs += $obj
$n++
}

What I want to do is add another property called LUNPath with the following code


LUNPath = (get-nalun | where {(get-nalunmap $_).lunid -eq LUN} |select path)

However, my experience with the PSObject is limited so I'm not sure if you can create a new property that references a previous one

If I am reading what you want to do correctly, you would access it by the following by "this.LUN". The "this" object refers back to the current PSObject, and then the .LUN property of "this". Hope that helps.

I just tried trhe following variations, none of which worked. I guess I've misunderstood ;)

LUNPath = (get-nalun | where {(get-nalunmap $_).lunid -eq "this.lun"} |select path)
LUNPath = (get-nalun | where {(get-nalunmap $_).lunid -eq this.lun} |select path)
LUNPath = (get-nalun | where {(get-nalunmap $_).lunid -eq "$this.lun"} |select path)
LUNPath = (get-nalun | where {(get-nalunmap $_).lunid -eq $this.lun} |select path)

Quick bump in the hope someone can help

To add a property that references another property, you need to use Add-Member to add a member of type ScriptProperty.  ScriptProperty members are evaluated when they are referenced, so they can use information in other members or methods.  For example, assuming that the LUN property had a child property called Path, you could expose it like this:

$obj = New-Object PSObject -Property @{
    Name = $csv.Name
    CSVPath = ( $csv | select -Property Name -ExpandProperty SharedVolumeInfo).FriendlyVolumeName
    LUN = ( Get-WmiObject Win32_DiskDrive | Where { "{0:x}" -f $_.Signature -eq $Signature } ).SCSILogicalUnit PhysicalDisk = ( Get-WmiObject Win32_DiskDrive | Where { "{0:x}" -f $_.Signature -eq $Signature } ).DeviceID.substring(4)
}
$obj | Add-Member -MemberType ScriptProperty -Name LUNPath -Value {$this.LUN.Path}

Just make sure you use $this inside the script block that defines the ScriptProperty member when you want to refer to the object itself.

Does that help?

Kirk,

OK. I can see how using the Add-Member cmdlet is the right approach. However, that line gives me a "Missing '=' operator after key in hash literal." if I put it inside the PSObject scriptblock