use where-object to find data, but want to add data to every row also the export to csv - json

Question

Hi I have a script that reads a csv file, creates a json file, checks the users in the file against a service, then i get the result as a json file.
I take that result and finds the users i csv file and creates a new file.
I do that with a where-object
But i need to add some extra values on every user before i export it to csv
This is my 2 lines for finding users and then export
$matches = $users | where-object { $_.number -in $response.allowedItemIds } | Select-Object -Property Number,Surname,Forename,Emailaddress
$matches | Export-Csv -path $Saved$savefile -NoTypeInformation -Append
Is that possible or do i need to do a for each?
Cheers

Answer 1

Assuming I've interpretted your question correctly, you should be able to use PowerShell's Calculated Properties for this purpose.
For example, if you wanted to add a field called "Date" and set the current Date/Time to each user row, you could do the following:
$matches = $users | where-object { $_.number -in $response.allowedItemIds } | Select-Object -Property Number,Surname,Forename,Emailaddress, #{Name="Date";Expression={Get-Date}}
The Expression value can either be a static value such as "StaticValue", a variable such as $i (useful if used as part of a loop, for example) or more complex value that is returned from other cmdlets (as in my example above)