Hiii

I want create a field in department form to set level of each department

So I defined a field with name : “level” in this way:

    level = fields.Integer('Level', compute="_calc_level" ,store=True)

and defined this function:

    def _calc_level(self):

        for obj in self.browse(self.ids):

            if obj.parent_id:

                obj.level = obj.parent_id.level+1

            else:

my data are:

  So departments “E,F,G” doesn’t have current level

But I don’t know what is wrong in my function?? 

Thanks