Powershell - Replacing rows in .csv with grouped items - powershell

Question

I have the following scenario.
A .csv file containing orders. Orders with multiple items are on separate rows.
I'm grouping rows by order id and sku to perform sums on some columns prior to exporting to .csv
I have the following code below which performs the grouping and sums and can write out the results to separate .csv
What I need to do is append the original .csv file by replacing the original rows with the summed rows.
Any help greatly appreciated
For example:
example
$output = #()
# Import .CSV and group on amazon-order-id and sku
# Filter group to only give lines with multiple occurances of each sku per order
Import-Csv D:\Exports\Test\AMAZON\*.csv | Group-Object amazon-order-id, sku | Where-Object {$_.Count -gt 1} |
# Loop through group object. Take first line of each group and place in $new variable
# Using dot notation, sum required columns and add rows to $output variable
ForEach-Object {
$new = $_.Group[0].psobject.Copy()
$new.'quantity-shipped' = ($_.Group | Measure-Object quantity-shipped -Sum).Sum
$new.'item-price' = ($_.Group | Measure-Object item-price -Sum).Sum
$new.'item-tax' = ($_.Group | Measure-Object item-tax -Sum).Sum
$new.'shipping-price' = ($_.Group | Measure-Object shipping-price -Sum).Sum
$new.'shipping-tax' = ($_.Group | Measure-Object shipping-tax -Sum).Sum
$new.'gift-wrap-price' = ($_.Group | Measure-Object gift-wrap-price -Sum).Sum
$new.'gift-wrap-tax' = ($_.Group | Measure-Object gift-wrap-tax -Sum).Sum
$new.'item-promotion-discount' = ($_.Group | Measure-Object item-promotion-discount -Sum).Sum
$new.'ship-promotion-discount' = ($_.Group | Measure-Object ship-promotion-discount -Sum).Sum
$output += $new
}
#Select all group members and export to .csv file
$output | select * | Export-Csv D:\Exports\Test\AMAZON\Import_Me.csv -not

Answer 1

I am assuming that you want to group common rows into a single row and only be left with those grouped single rows plus uncommon rows.
$CSVFiles = Get-ChildItem -Path D:\Exports\Test\AMAZON -File -Filter '*.csv' | Where Extension -eq '.csv'
$output = foreach ($csv in $CSVFiles) {
$csvOutput = Import-Csv $csv.FullName
$group = $csvOutput | Group-Object amazon-order-id, sku
$group | Where Count -gt 1 | Foreach-Object {
$_.Group[0].'quantity-shipped' = ($_.Group | Measure-Object quantity-shipped -Sum).Sum
$_.Group[0].'item-price' = ($_.Group | Measure-Object item-price -Sum).Sum
$_.Group[0].'item-tax' = ($_.Group | Measure-Object item-tax -Sum).Sum
$_.Group[0].'shipping-price' = ($_.Group | Measure-Object shipping-price -Sum).Sum
$_.Group[0].'shipping-tax' = ($_.Group | Measure-Object shipping-tax -Sum).Sum
$_.Group[0].'gift-wrap-price' = ($_.Group | Measure-Object gift-wrap-price -Sum).Sum
$_.Group[0].'gift-wrap-tax' = ($_.Group | Measure-Object gift-wrap-tax -Sum).Sum
$_.Group[0].'item-promotion-discount' = ($_.Group | Measure-Object item-promotion-discount -Sum).Sum
$_.Group[0].'ship-promotion-discount' = ($_.Group | Measure-Object ship-promotion-discount -Sum).Sum
}
$group | Foreach-Object { $_.Group[0] } # Output to variable only
$group | Foreach-Object { $_.Group[0] } | Export-Csv $csv.FullName -NoType
}
$output
Explanation:
$CSVFiles is a collection of CSV files. We need to be able to target them one-by-one to know which file to update. Each file is targeted using a foreach loop with the current file being $csv.
Since $csvOutput is the contents of a CSV file as an array of PSCustomObjects, we can update each object with a Foreach-Object and it will be reflected back in $csvOutput.
$group is assigned the Group-Object output of each CSV file. Using a variable here minimizes the grouping action to only once per file. First, perform the modifications on each group where there are multiple matches. Using your logic, the first object in a grouping is modified. A Foreach-Object is used to go through all the groupings.
Once all modifications are done for one CSV file, $group is output (this includes multiple and single groupings) and only the first object in a grouping is selected ($_.Group[0]) using another Foreach-Object, which works for the single object groupings as well. That output is passed into Export-Csv to update the appropriate file.
$output lists all CSV contents after modifications.