import marshmallow_objects as marshmallow


class Artist(marshmallow.Model):
    name = marshmallow.fields.Str()


class Album(marshmallow.Model):
    title = marshmallow.fields.Str()
    release_date = marshmallow.fields.Date()
    artist = marshmallow.NestedModel(Artist)


bowie_raw = dict(name='David Bowie')
album_raw = dict(artist=bowie_raw, title='Hunky Dory',
                 release_date='1971-12-17')

album = Album(**album_raw)
print(album.title)
print(album.release_date)
print(album.artist.name)

# Hunky Dory
# 1971-12-17
# David Bowie