42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
import orm
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import databases
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import sqlalchemy
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database = databases.Database("sqlite:///db.sqlite")
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metadata = sqlalchemy.MetaData()
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class Album(orm.Model):
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__tablename__ = "album"
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__metadata__ = metadata
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__database__ = database
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id = orm.Integer(primary_key=True)
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name = orm.String(length=100)
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class Track(orm.Model):
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__tablename__ = "track"
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__metadata__ = metadata
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__database__ = database
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id = orm.Integer(primary_key=True)
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album = orm.ForeignKey(Album, nullable=False)
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title = orm.String(length=100)
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position = orm.Integer()
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album = await Album.objects.create(name="Brooklyn")
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await Track.objects.create(album=album, title="The Bird", position=1)
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# explicit preload of related Album Model
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track = await Track.objects.select_related("album").get(title="The Bird")
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assert track.album.name == 'Brooklyn'
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# Will produce: True
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# even without explicit select_related if ForeignKey is not nullable,
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# the Album Model is still preloaded.
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track2 = await Track.objects.get(title="The Bird")
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assert track2.album.name == 'Brooklyn'
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# Will produce: True
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