@api.model
def create(self, values):
    if 'name' in values:
        values['name'] = unidecode(values['name'])
    return super(my_module, self).create(values)

def write(self, values):
    if 'name' in values:
        values['name'] = unidecode(values['name'])
    return super(my_module, self).write(values)