@classmethod
def _load_related_objects(cls, response, client):
    """
        The relationships of the ImageUpload are not first-class CatalogObjects,
        so we need slightly different handling here.
        """
    related_objects = {}
    related_objects_serialized = response.get('included')
    if related_objects_serialized:
        for serialized in related_objects_serialized:
            model_class = cls._upload_model_classes[serialized['type']]
            if model_class:
                related = model_class(validate=False, id=serialized['id'],
                    **serialized['attributes'])
                related_objects[serialized['type'], serialized['id']] = related
    return related_objects
