# Source code for sqlalchemy_utils.types.arrow

    from ..exceptions import ImproperlyConfigured
    from .enriched_datetime import ArrowDateTime
    from .enriched_datetime.enriched_datetime_type import EnrichedDateTimeType

    arrow = None
    try:
        import arrow
    except ImportError:
        pass

    class ArrowType(EnrichedDateTimeType):
        """
        ArrowType provides way of saving Arrow_ objects into database. It
        automatically changes Arrow_ objects to datetime objects on the way in and
        datetime objects back to Arrow_ objects on the way out (when querying
        database). ArrowType needs Arrow_ library installed.

        .. _Arrow: https://github.com/arrow-py/arrow

        ::

            from datetime import datetime
            from sqlalchemy_utils import ArrowType
            import arrow

            class Article(Base):
                __tablename__ = 'article'
                id = sa.Column(sa.Integer, primary_key=True)
                name = sa.Column(sa.Unicode(255))
                created_at = sa.Column(ArrowType)

            article = Article(created_at=arrow.utcnow())

        As you may expect all the arrow goodies come available:

        ::

            article.created_at = article.created_at.replace(hours=-1)

            article.created_at.humanize()
            # 'an hour ago'

        """
        cache_ok = True

        def __init__(self, *args, **kwargs):
            if not arrow:
                raise ImproperlyConfigured(
                    "'arrow' package is required to use 'ArrowType'"
                )

            super().__init__(
                datetime_processor=ArrowDateTime,
                *args,
                **kwargs
            )