How to use the productmd.images.SUPPORTED_IMAGE_TYPES function in productmd

from pdc.apps.common.fields import ChoiceSlugField
from pdc.apps.common.serializers import StrictSerializerMixin
from pdc.apps.repository.serializers import RepoField


class ImageFormatSerializer(serializers.SlugRelatedField):
    doc_format = " | ".join(images.SUPPORTED_IMAGE_FORMATS)

    def __init__(self):
        super(ImageFormatSerializer, self).__init__(
            slug_field='name',
            queryset=models.ImageFormat.objects.all())


class ImageTypeSerializer(serializers.SlugRelatedField):
    doc_format = " | ".join(images.SUPPORTED_IMAGE_TYPES)

    def __init__(self):
        super(ImageTypeSerializer, self).__init__(
            slug_field='name',
            queryset=models.ImageType.objects.all())


class DefaultFilenameGenerator(object):
    doc_format = '{name}-{version}-{release}.{arch}.rpm'

    def __call__(self):
        return models.RPM.default_filename(self.field.parent.initial_data)

    def set_context(self, field):
        self.field = field

def sync_image_formats_and_types():
    logger = logging.getLogger(__name__)
    missing_image_formats = set(images.SUPPORTED_IMAGE_FORMATS) - set([obj.name for obj in ImageFormat.objects.all()])
    missing_image_types = set(images.SUPPORTED_IMAGE_TYPES) - set([obj.name for obj in ImageType.objects.all()])

    for image_format in missing_image_formats:
        ImageFormat.objects.create(name=image_format)
        logger.info("Created image format %s" % image_format)
    for image_type in missing_image_types:
        ImageType.objects.create(name=image_type)
        logger.info("Created image type %s" % image_type)