How can I override method of core doctype which is not class method or whitelisted method?

[Rajvi]

hello @moe01325
In Email Campaign , there is set_email_campaign_status method which runs daily as it is in schedular events. But this method has error as it is not updating status in database. And because of this issue Email Campaign is not working. So I want to override this method to solve this by saving updated status in database.

Earlier Email Campaign issue is discussed. But there was no solution.

Email Campaign issues

ISSUES: [Screenshot from 2022-08-12 12-19-14] [Screenshot from 2022-08-12 12-19-26] Once we set the email campaign we can view the list view like the one given below screenshot. Even After the end date passes the email is sent to the customers. In the status, it just shows as it was “In Progress” or “Scheduled”. No update we get an email sent or not sent. Nothing gets triggered after the date passes. So mass mailing system does not work in an email campaign. For now, we are only able to se…

Email Campaigns in progress for days - stuck process?

Email Campaign are not being sent. The status is stuck at “In Progress” for some days now. How do I begin yo troubleshoot this?

So I have checked core methods and found error in this method which is responsible for this issue.