Gmail Emails Counts by Script - google-apps-script

Question

I am trying to count all my emails, with the label " complete - others", with Google Scripts. The thing is, the query is not counting all the emails. If I look into the label, I have, at least, 21k threads, and the script counts me just 591 emails.
Do you know how can I do to get this corrected?
Thanks !
Code sample:
`function countMessages3() {
var spreadsheet = SpreadsheetApp.getActive()
SpreadsheetApp.setActiveSheet(spreadsheet.getSheetByName('Mails'))
var threads = GmailApp.search('in:sent');
var receivedCount = 0;
for(var i=0; i<threads.length; i++)
{
receivedCount = receivedCount + threads[i].getMessageCount();
}
spreadsheet.getRange('\'Mails\'!B4').setValue(receivedCount);`

Answer 1

I guess, the code that you have provided is searching messages in sent folder. To search messages in a label I think you do something like:
1.Get label using getUserLabelByName() https://developers.google.com/apps-script/reference/gmail/gmail-app.html#getuserlabelbynamename
2.Get all threads for that label using getThreads() https://developers.google.com/apps-script/reference/gmail/gmail-label.html#getthreads
3.Then aggregate messages count in each thread using getMessageCount()
https://developers.google.com/apps-script/reference/gmail/gmail-thread.html#getmessagecount
Something like this :
var labelName = "complete-others";
var messageCount = 0;
var label = GmailApp.getUserLabelByName(labelName);
var threads = label.getThreads();
threads.forEach(function(thread) {
messageCount += thread.getMessageCount();
});
spreadsheet.getRange('\'Mails\'!B4').setValue(messageCount);

Answer 2

Here's a function that will count your emails.
function countEmailsWithLabel(query) {
var n=0;
var ts=GmailApp.search(query);
ts.forEach(function(t,i){
var ms=t.getMessages();
n+=ms.length;
});
Logger.log(n);
return n;
}
The problem of course is figuring what the search query supposed to be. I have several test emails in a label I created as 'Q0/TEST' but where I search in Gmail I see that the search is 'label:q0-test' which doesn't agree with my label. So I tried searching with a search query of 'label:q0-test' and that didn't work. So now I use the query with the label as I created it so that the search query is now 'label:Q0/TEST' and I get the correct result of 3. So I would recommend that you use the labels as you created them rather than what you see in search box of the Gmail search.
Actually I ran into this inconsistency a few weeks ago and I suspect it has probably caused some difficulties for new programmers.