hello, i wanted to know how in my many2one field to get the logged user i have found a lot of solution by putting in default value lambda self,cr,uid, context: self.pool.get('res.users').browse(cr, uid, uid, context).id, something like this but in fact it's not what i want to.

for example if the user X has create a record it will be by defaut X in my many2one but i want that if another user Y click on that record(-that X have created) my many2one field will change with Y that means i want the current user no the user when the record has been created 

thanks a lot