Hi,

In Odoo any button click will save the record in the database. So you don't need to call  any other method to save the record.

Hope it helps

I don't know what you wanna mean with save​ but in Odoo save it's create​ or write​ and that will happens always before  the button method call execution. 

Perhaps you are referring to the regular Save​ button from older Odoo versions... In Odoo 16 that have changed into automatically save the record without the need to hit the save button. I'm not a fan of that also but there is a button that appears for manually save the form without the need to click away from the current form in order to save it. 

Perhaps you want another button to trigger the save. You can just put a regular Button calling an empty method and everything will be saved first