strange behaviour when bulk updating the file name in an attachment using scripting

[Antony_Rappai]

Hello, folks, i am trying to change the filename for files in an attachment field, and i noticed that when there are a few records it seems like the names get changed, but when i try to process more than 30, the attachments automatically get removed. I also noticed that the comments in the records id indicate that two actions have taken place 

But for the ones that worked it shows just one time the record has been edited 

The script that i use is below, i noticed a similar behavior when i was trying to upload attachments from a URL as well, some get updated, while some do not. 

// Define the table, view, and field names
const tableName = 'StuTable';
const viewName = 'StuMissingcert';
const attachmentFieldName = 'medicalupload';
const studentIDFieldName = 'id';

// Select the table, view, and get the records
const table = base.getTable(tableName);
const view = table.getView(viewName);
const records = await view.selectRecordsAsync();

// Iterate through the records
for (let record of records.records) {
    // Get the attachment field data and student ID
    const attachments = record.getCellValue(attachmentFieldName);
    const studentID = record.getCellValue(studentIDFieldName);

    // Check if there are attachments
    if (attachments && attachments.length > 0) {
        // Replace the file names with the student ID
        const updatedAttachments = attachments.map(attachment => {
            // Use the student ID as the new file name
            const newFileName = studentID;

            return {
                url: attachment.url,
                filename: newFileName
            };
        });

        // Update the record with the new file names
        await table.updateRecordAsync(record, {
            [attachmentFieldName]: updatedAttachments
        });
    }
}

[Alexey_Gusev]

Hi,

I'm not sure if this a reason, but using single update actions in a loop can cause problems. Airtable has limit for updates per second (15 or 25, I can't remember). If your computer is slow enough or operation inside loop exceed some amount of milliseconds to execute, then script will run OK. But that's a matter of luck, the correct way is to form array of updates and then use updateRecordsAsync.

[Alexey_Gusev]

I also noticed that you use the same filename for all attachments in record (according to value of 'id' field), but it cannot be the reason.

anyway, I refactored your script (under 7th line) and it worked, you can try 

const records = await view.selectRecordsAsync();

const value = record => record.getCellValue(attachmentFieldName);
const newID = record => record.getCellValue(studentIDFieldName);
const filtered=records.records.filter(r=>value(r)&&value(r).length)
const newnames=r=>value(r).map(a=>({'url':a.url,'filename':newID(r)}))
const update=r=>({id:r.id,fields:{[attachmentFieldName]:newnames(r)}})
const upd=filtered.map(update)
while (upd.length) await table.updateRecordsAsync(upd.splice(0,50))