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Mike Bayer
24 lines
1.1 KiB
Python
24 lines
1.1 KiB
Python
"""
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Illustrates various methods of associating multiple types of
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parents with a particular child object.
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The examples all use the declarative extension along with
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declarative mixins. Each one presents the identical use
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case at the end - two classes, ``Customer`` and ``Supplier``, both
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subclassing the ``HasAddresses`` mixin, which ensures that the
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parent class is provided with an ``addresses`` collection
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which contains ``Address`` objects.
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The configurations include:
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* ``table_per_related.py`` - illustrates a distinct table per related collection.
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* ``table_per_association.py`` - illustrates a shared collection table, using a
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table per association.
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* ``discriminator_on_association.py`` - shared collection table and shared
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association table, including a discriminator column.
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The ``discriminator_on_association.py`` script in particular is a modernized
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version of the "polymorphic associations" example present in older versions of
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SQLAlchemy, originally from the blog post at http://techspot.zzzeek.org/2007/05/29/polymorphic-associations-with-sqlalchemy/.
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""" |