Hello aci aisha,

LIBU has given corret answer. I will improve his answer.

1) When you click for the very first time on save button after providing detail of your record than it will call the save button of orm.

2) when you update the information of of existing it will call the write() method.

These methods defined in base model.

Whenever we are defining any class we are passing one argument in class like

class your_class(models.Model),

class your_class(osv.Model) or class your_class(osv.osv)

whatever version you are using you are passing something in your class this is the base class where all the methods are defined.

Hope this will helps.

Regards,

Anil.