Serialize all child-items along with their related media items

SerializeItemsWithMedia.ps1

<#
    .SYNOPSIS
        Serialize items AND related media items.
    
    .NOTES
        Alex Washtell
#>

filter Is-InMediaLibrary {
    if($_.FullPath.StartsWith("/sitecore/media library")) {
        $_
    }
}

$sourceItems = Get-ChildItem -recurse
$linkDb = [Sitecore.Globals]::LinkDatabase
$requiredAncestors = new-object 'System.Collections.Generic.HashSet[string]'

foreach($sourceItem in $sourceItems)
{
    # Serialize item
    Write-Host "Serializing $($sourceItem.Paths.FullPath)"
    $sourceItem | serialize-item
    
    # Find related media
    $targetMediaItems = $linkDb.GetReferences($sourceItem) | %{ get-item master: -ID $_.TargetItemID } | Is-InMediaLibrary
    
    foreach($targetItem in $targetMediaItems )
    {
        Write-Host "--- Related Media $($targetItem.Paths.FullPath)"
        $targetItem | serialize-item
        
        $parentItem = $targetItem.Parent
        
        while ($parentItem -ne $null)
        {
            Write-Host "----- Adding parent $($parentItem.Paths.FullPath)"
            $requiredAncestors.Add($parentItem.Paths.FullPath) > $null
            $parentItem = $parentItem.Parent
        }
    }
}

# Process the set of required ancestors
foreach($ancestor in $requiredAncestors)
{
    Write-Host "Required ancestor $($ancestor)"
    serialize-item -Path $ancestor
}

Write-Host "Done!"