mirror of
https://github.com/sqlalchemy/sqlalchemy.git
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Mike Bayer
8af45f93cb
to use declarative, added a new example dict_of_sets_with_default.py, a "pushing the envelope" example of association proxy.
20 lines
923 B
Python
20 lines
923 B
Python
"""
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Examples illustrating the usage of the "association object" pattern,
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where an intermediary class mediates the relationship between two
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classes that are associated in a many-to-many pattern.
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This directory includes the following examples:
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* basic_association.py - illustrate a many-to-many relationship between an
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"Order" and a collection of "Item" objects, associating a purchase price
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with each via an association object called "OrderItem"
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* proxied_association.py - same example as basic_association, adding in
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usage of :mod:`sqlalchemy.ext.associationproxy` to make explicit references
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to "OrderItem" optional.
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* dict_of_sets_with_default.py - an advanced association proxy example which
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illustrates nesting of association proxies to produce multi-level Python
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collections, in this case a dictionary with string keys and sets of integers
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as values, which conceal the underlying mapped classes.
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""" |