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e f d „ ƒ YZ d e f d „ ƒ YZ d S( sõ Contain the ``AssociationProxy`` class.
The ``AssociationProxy`` is a Python property object which provides
transparent proxied access to the endpoint of an association object.
See the example ``examples/association/proxied_association.py``.
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exceptions( t orm( t util( t collectionsc K s t | | | S( sr Return a Python property implementing a view of *attr* over a collection.
Implements a read/write view over an instance's *target_collection*,
extracting *attr* from each member of the collection. The property acts
somewhat like this list comprehension::
[getattr(member, *attr*)
for member in getattr(instance, *target_collection*)]
Unlike the list comprehension, the collection returned by the property is
always in sync with *target_collection*, and mutations made to either
collection will be reflected in both.
Implements a Python property representing a relation as a collection of
simpler values. The proxied property will mimic the collection type of
the target (list, dict or set), or, in the case of a one to one relation,
a simple scalar value.
:param target_collection: Name of the relation attribute we'll proxy to,
usually created with :func:`~sqlalchemy.orm.relation`.
:param attr: Attribute on the associated instances we'll proxy for.
For example, given a target collection of [obj1, obj2], a list created
by this proxy property would look like [getattr(obj1, *attr*),
getattr(obj2, *attr*)]
If the relation is one-to-one or otherwise uselist=False, then simply:
getattr(obj, *attr*)
:param creator: optional.
When new items are added to this proxied collection, new instances of
the class collected by the target collection will be created. For list
and set collections, the target class constructor will be called with
the 'value' for the new instance. For dict types, two arguments are
passed: key and value.
If you want to construct instances differently, supply a *creator*
function that takes arguments as above and returns instances.
For scalar relations, creator() will be called if the target is None.
If the target is present, set operations are proxied to setattr() on the
associated object.
If you have an associated object with multiple attributes, you may set
up multiple association proxies mapping to different attributes. See
the unit tests for examples, and for examples of how creator() functions
can be used to construct the scalar relation on-demand in this
situation.
:param \*\*kw: Passes along any other keyword arguments to
:class:`AssociationProxy`.
( t AssociationProxy( t target_collectiont attrt kw( ( sC /usr/lib/python2.6/site-packages/sqlalchemy/ext/associationproxy.pyt association_proxy s 8R c B s’ e Z d Z d
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d S( sª Arguments are:
target_collection
Name of the collection we'll proxy to, usually created with
'relation()' in a mapper setup.
attr
Attribute on the collected instances we'll proxy for. For example,
given a target collection of [obj1, obj2], a list created by this
proxy property would look like [getattr(obj1, attr), getattr(obj2,
attr)]
creator
Optional. When new items are added to this proxied collection, new
instances of the class collected by the target collection will be
created. For list and set collections, the target class constructor
will be called with the 'value' for the new instance. For dict
types, two arguments are passed: key and value.
If you want to construct instances differently, supply a 'creator'
function that takes arguments as above and returns instances.
getset_factory
Optional. Proxied attribute access is automatically handled by
routines that get and set values based on the `attr` argument for
this proxy.
If you would like to customize this behavior, you may supply a
`getset_factory` callable that produces a tuple of `getter` and
`setter` functions. The factory is called with two arguments, the
abstract type of the underlying collection and this proxy instance.
proxy_factory
Optional. The type of collection to emulate is determined by
sniffing the target collection. If your collection type can't be
determined by duck typing or you'd like to use a different
collection implementation, you may supply a factory function to
produce those collections. Only applicable to non-scalar relations.
proxy_bulk_set
Optional, use with proxy_factory. See the _set() method for
details.
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lazy_collection
A callable returning a list-based collection of entities (usually an
object attribute managed by a SQLAlchemy relation())
creator
A function that creates new target entities. Given one parameter:
value. This assertion is assumed::
obj = creator(somevalue)
assert getter(obj) == somevalue
getter
A function. Given an associated object, return the 'value'.
setter
A function. Given an associated object and a value, store that
value on the object.
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For the actual domain objects, iterate over .col instead or
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