mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-27 19:15:05 -04:00
Mike Bayer
20 lines
922 B
Python
20 lines
922 B
Python
"""
|
|
|
|
Examples illustrating the usage of the "association object" pattern,
|
|
where an intermediary class mediates the relationship between two
|
|
classes that are associated in a many-to-many pattern.
|
|
|
|
This directory includes the following examples:
|
|
|
|
* basic_association.py - illustrate a many-to-many relationship between an
|
|
"Order" and a collection of "Item" objects, associating a purchase price
|
|
with each via an association object called "OrderItem"
|
|
* proxied_association.py - same example as basic_association, adding in
|
|
usage of :mod:`sqlalchemy.ext.associationproxy` to make explicit references
|
|
to "OrderItem" optional.
|
|
* dict_of_sets_with_default.py - an advanced association proxy example which
|
|
illustrates nesting of association proxies to produce multi-level Python
|
|
collections, in this case a dictionary with string keys and sets of integers
|
|
as values, which conceal the underlying mapped classes.
|
|
|
|
""" |