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I want to create a new record with attachments in batch processing

Answer

Please use the "Record Creation API".

Overview

If you want to create records that include attachments in batch processing, use the "Record Creation API". Set the contents described in "JSON Data Layout: Item" in the "Attachments" object of the data to be posted.

Code Samples

PowerShell
Add-Type -AssemblyName "System.Web"
$error.Clear()
$requestUrl = "http://servername/api/items/2/create"
$apiKey = "af14A56RE68ssa320..."
$file = Get-Item "C:\Work\Test.pptx"
trap [Net.WebException] { continue; }
try{
    $contentType = [System.Web.MimeMapping]::GetMimeMapping($file.FullName)
    $base64filelist = New-Object System.Collections.ArrayList
    [void]$base64filelist.Add(@{
        Name = $file.Name
        ContentType = $contentType
        Base64 = [Convert]::ToBase64String([System.IO.File]::ReadAllBytes($file.FullName))
    })
    $json = @{
        ApiKey = $apiKey
        Title = "Test"
        AttachmentsHash = @{
            AttachmentsA =  $base64filelist
        }
    }
    $requestBody = $json | ConvertTo-Json -Depth 3
    $res = Invoke-RestMethod -Uri $requestUrl -ContentType "application/json" -Method POST -Body ${requestBody}
    Write-Output $res
}
catch {
    Write-Output $_.Exception
}
if ($error.Count -gt 0)
{
    Write-Output $error[0].ErrorDetails.Message | ConvertFrom-Json
}