from __future__ import unicode_literals

import logging

from django.apps import apps
from django.db import models

logger = logging.getLogger(__name__)


class DocumentTypeSettingsManager(models.Manager):
    def get_by_natural_key(self, document_type_natural_key):
        DocumentType = apps.get_model(
            app_label='documents', model_name='DocumentType'
        )
        try:
            document_type = DocumentType.objects.get_by_natural_key(
                document_type_natural_key
            )
        except DocumentType.DoesNotExist:
            raise self.model.DoesNotExist

        return self.get(document_type__pk=document_type.pk)