How to Attach Google Drive File with sendMail Function in Apps Script? - google-apps-script

Question

Looking to attach a file (pdfName) from Google Drive to sendMail function in Apps Script. Currently not pulling with the code I have below. Everything else works perfectly. Just having trouble with the attach portion.
function send(formObj) {
var to = formObj.email;
var body = formObj.body;
var sheetName = "POTemplate";
var sourceSpreadsheet = SpreadsheetApp.getActive();
var sourceSheet = sourceSpreadsheet.getSheetByName(sheetName);
var poNo = sourceSheet.getRange("b2").getValue();
var pdfName = "Sample PO Hi Eric " + poNo;
var subject = poNo + " Good morning, Eric";
var attach = DriveApp.getFilesByName(pdfName);
MailApp.sendEmail(to, subject, body, {attachments:[attach]});
}

Answer 1

It looks like, according to the GAS Documentation on sendMail, the attachments argument requires a BlobSource[] (documentation). However getFilesByName() returns a FileIterator. You need to give MailApp any filetype that implements BlobSource.
So to clarify the main issue is that you are trying to give sendMail a list of files (in the form of FileIterator) instead of just one file.
So something like this should work:
function send(formObj) {
var to = formObj.email;
var body = formObj.body;
var sheetName = "POTemplate";
var sourceSpreadsheet = SpreadsheetApp.getActive();
var sourceSheet = sourceSpreadsheet.getSheetByName(sheetName);
var poNo = sourceSheet.getRange("b2").getValue();
var pdfName = "Sample PO Hi Eric " + poNo;
var subject = poNo + " Good morning, Eric";
var listOfFiles = DriveApp.getFilesByName(pdfName); //returns FileIterator of files that match name given.
if(listOfFiles.hasNext()){ //We should check if there is a file in there and die if not.
var file = listOfFiles.next(); //gets first file in list.
MailApp.sendEmail(to, subject, body, {attachments:[file]});
}else{
console.log("Error no file in listOfFiles. Email not sent.");
}
}
edit: I just did some testing and it looks like, for PDFs, the getBlob() is not necessary so I have removed it from my code!