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"""
Examples illustrating the usage of the "association object" pattern,
where an intermediary object associates two endpoint objects together.
The first example illustrates a basic association from a User object
to a collection or Order objects, each which references a collection of Item objects.
The second example builds upon the first to add the Association Proxy extension.
E.g.::
# create an order
order = Order('john smith')
# append an OrderItem association via the "itemassociations"
# collection with a custom price.
order.itemassociations.append(OrderItem(item('MySQL Crowbar'), 10.99))
# append two more Items via the transparent "items" proxy, which
# will create OrderItems automatically using the default price.
order.items.append(item('SA Mug'))
order.items.append(item('SA Hat'))
"""
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