Pass in a mongo model class and extract all the attributes which
    are mongoengine fields

    Returns:
        list of strings of field attributes

def get_fields(model_class):
    """
    Pass in a mongo model class and extract all the attributes which
    are mongoengine fields

    Returns:
        list of strings of field attributes
    """
    return [
        attr for attr, value in model_class.__dict__.items()
        if issubclass(type(value), (mongo.base.BaseField, mongo.EmbeddedDocumentField))  # noqa
    ]