save xml to models

def fill_model_by_xml_fields(mdl, data):
    model=mdl
    relations = [rel for rel in model._meta.get_all_related_objects() if rel.related_model!=model]
    if len(relations):
        for relation in relations:
            m = relation.related_model
            fields=m._meta.fields
            parent_elems_name = m._meta.verbose_name_plural
            parent_elem_name = m._meta.verbose_name
            parent_elems=[data]
            if data.tag != parent_elem_name:
                parent_elems = data.findall('.//%s/%s' % (parent_elems_name, parent_elem_name))

            map_data={}
            for parent_elem in parent_elems:
                for field in fields:
                    if not field.auto_created and field.help_text!='':
                        value = parent_elem.find('.//%s' % field.help_text).text
                        if issubclass(field.__class__, DateTimeField):

                            try:
                                value=dateutil.parser.parse(value)
                            except Exception as e:
                                print(e)
                        map_data[field.name] = value

                mdl, created = m.objects.update_or_create(**map_data)
                setattr(mdl,relation.remote_field.name,model)
                mdl.save()

        # TODO предварительно планируется ограничить кол-во связей один ко многим в модели до 1 для упродения структуры данных
                fill_model_by_xml_fields(mdl, parent_elem)