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1628 lines
50 KiB
1628 lines
50 KiB
# ext/associationproxy.py
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# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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"""Contain the ``AssociationProxy`` class.
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The ``AssociationProxy`` is a Python property object which provides
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transparent proxied access to the endpoint of an association object.
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See the example ``examples/association/proxied_association.py``.
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"""
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import operator
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from .. import exc
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from .. import inspect
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from .. import orm
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from .. import util
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from ..orm import collections
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from ..orm import interfaces
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from ..sql import or_
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from ..sql.operators import ColumnOperators
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def association_proxy(target_collection, attr, **kw):
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r"""Return a Python property implementing a view of a target
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attribute which references an attribute on members of the
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target.
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The returned value is an instance of :class:`.AssociationProxy`.
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Implements a Python property representing a relationship as a collection
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of simpler values, or a scalar value. The proxied property will mimic
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the collection type of the target (list, dict or set), or, in the case of
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a one to one relationship, a simple scalar value.
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:param target_collection: Name of the attribute we'll proxy to.
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This attribute is typically mapped by
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:func:`~sqlalchemy.orm.relationship` to link to a target collection, but
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can also be a many-to-one or non-scalar relationship.
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:param attr: Attribute on the associated instance or instances we'll
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proxy for.
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For example, given a target collection of [obj1, obj2], a list created
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by this proxy property would look like [getattr(obj1, *attr*),
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getattr(obj2, *attr*)]
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If the relationship is one-to-one or otherwise uselist=False, then
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simply: getattr(obj, *attr*)
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:param creator: optional.
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When new items are added to this proxied collection, new instances of
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the class collected by the target collection will be created. For list
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and set collections, the target class constructor will be called with
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the 'value' for the new instance. For dict types, two arguments are
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passed: key and value.
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If you want to construct instances differently, supply a *creator*
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function that takes arguments as above and returns instances.
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For scalar relationships, creator() will be called if the target is None.
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If the target is present, set operations are proxied to setattr() on the
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associated object.
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If you have an associated object with multiple attributes, you may set
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up multiple association proxies mapping to different attributes. See
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the unit tests for examples, and for examples of how creator() functions
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can be used to construct the scalar relationship on-demand in this
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situation.
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:param \*\*kw: Passes along any other keyword arguments to
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:class:`.AssociationProxy`.
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"""
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return AssociationProxy(target_collection, attr, **kw)
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ASSOCIATION_PROXY = util.symbol("ASSOCIATION_PROXY")
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"""Symbol indicating an :class:`.InspectionAttr` that's
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of type :class:`.AssociationProxy`.
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Is assigned to the :attr:`.InspectionAttr.extension_type`
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attribute.
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"""
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class AssociationProxy(interfaces.InspectionAttrInfo):
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"""A descriptor that presents a read/write view of an object attribute."""
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is_attribute = True
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extension_type = ASSOCIATION_PROXY
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def __init__(
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self,
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target_collection,
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attr,
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creator=None,
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getset_factory=None,
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proxy_factory=None,
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proxy_bulk_set=None,
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info=None,
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cascade_scalar_deletes=False,
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):
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"""Construct a new :class:`.AssociationProxy`.
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The :func:`.association_proxy` function is provided as the usual
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entrypoint here, though :class:`.AssociationProxy` can be instantiated
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and/or subclassed directly.
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:param target_collection: Name of the collection we'll proxy to,
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usually created with :func:`_orm.relationship`.
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:param attr: Attribute on the collected instances we'll proxy
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for. For example, given a target collection of [obj1, obj2], a
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list created by this proxy property would look like
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[getattr(obj1, attr), getattr(obj2, attr)]
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:param creator: Optional. When new items are added to this proxied
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collection, new instances of the class collected by the target
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collection will be created. For list and set collections, the
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target class constructor will be called with the 'value' for the
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new instance. For dict types, two arguments are passed:
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key and value.
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If you want to construct instances differently, supply a 'creator'
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function that takes arguments as above and returns instances.
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:param cascade_scalar_deletes: when True, indicates that setting
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the proxied value to ``None``, or deleting it via ``del``, should
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also remove the source object. Only applies to scalar attributes.
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Normally, removing the proxied target will not remove the proxy
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source, as this object may have other state that is still to be
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kept.
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.. versionadded:: 1.3
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.. seealso::
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:ref:`cascade_scalar_deletes` - complete usage example
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:param getset_factory: Optional. Proxied attribute access is
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automatically handled by routines that get and set values based on
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the `attr` argument for this proxy.
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If you would like to customize this behavior, you may supply a
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`getset_factory` callable that produces a tuple of `getter` and
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`setter` functions. The factory is called with two arguments, the
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abstract type of the underlying collection and this proxy instance.
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:param proxy_factory: Optional. The type of collection to emulate is
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determined by sniffing the target collection. If your collection
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type can't be determined by duck typing or you'd like to use a
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different collection implementation, you may supply a factory
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function to produce those collections. Only applicable to
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non-scalar relationships.
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:param proxy_bulk_set: Optional, use with proxy_factory. See
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the _set() method for details.
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:param info: optional, will be assigned to
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:attr:`.AssociationProxy.info` if present.
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.. versionadded:: 1.0.9
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"""
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self.target_collection = target_collection
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self.value_attr = attr
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self.creator = creator
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self.getset_factory = getset_factory
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self.proxy_factory = proxy_factory
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self.proxy_bulk_set = proxy_bulk_set
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self.cascade_scalar_deletes = cascade_scalar_deletes
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self.key = "_%s_%s_%s" % (
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type(self).__name__,
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target_collection,
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id(self),
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)
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if info:
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self.info = info
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def __get__(self, obj, class_):
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if class_ is None:
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return self
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inst = self._as_instance(class_, obj)
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if inst:
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return inst.get(obj)
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# obj has to be None here
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# assert obj is None
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return self
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def __set__(self, obj, values):
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class_ = type(obj)
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return self._as_instance(class_, obj).set(obj, values)
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def __delete__(self, obj):
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class_ = type(obj)
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return self._as_instance(class_, obj).delete(obj)
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def for_class(self, class_, obj=None):
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r"""Return the internal state local to a specific mapped class.
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E.g., given a class ``User``::
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class User(Base):
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# ...
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keywords = association_proxy('kws', 'keyword')
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If we access this :class:`.AssociationProxy` from
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:attr:`_orm.Mapper.all_orm_descriptors`, and we want to view the
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target class for this proxy as mapped by ``User``::
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inspect(User).all_orm_descriptors["keywords"].for_class(User).target_class
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This returns an instance of :class:`.AssociationProxyInstance` that
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is specific to the ``User`` class. The :class:`.AssociationProxy`
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object remains agnostic of its parent class.
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:param class\_: the class that we are returning state for.
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:param obj: optional, an instance of the class that is required
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if the attribute refers to a polymorphic target, e.g. where we have
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to look at the type of the actual destination object to get the
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complete path.
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.. versionadded:: 1.3 - :class:`.AssociationProxy` no longer stores
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any state specific to a particular parent class; the state is now
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stored in per-class :class:`.AssociationProxyInstance` objects.
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"""
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return self._as_instance(class_, obj)
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def _as_instance(self, class_, obj):
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try:
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inst = class_.__dict__[self.key + "_inst"]
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except KeyError:
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inst = None
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# avoid exception context
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if inst is None:
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owner = self._calc_owner(class_)
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if owner is not None:
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inst = AssociationProxyInstance.for_proxy(self, owner, obj)
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setattr(class_, self.key + "_inst", inst)
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else:
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inst = None
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if inst is not None and not inst._is_canonical:
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# the AssociationProxyInstance can't be generalized
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# since the proxied attribute is not on the targeted
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# class, only on subclasses of it, which might be
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# different. only return for the specific
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# object's current value
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return inst._non_canonical_get_for_object(obj)
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else:
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return inst
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def _calc_owner(self, target_cls):
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# we might be getting invoked for a subclass
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# that is not mapped yet, in some declarative situations.
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# save until we are mapped
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try:
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insp = inspect(target_cls)
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except exc.NoInspectionAvailable:
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# can't find a mapper, don't set owner. if we are a not-yet-mapped
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# subclass, we can also scan through __mro__ to find a mapped
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# class, but instead just wait for us to be called again against a
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# mapped class normally.
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return None
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else:
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return insp.mapper.class_manager.class_
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def _default_getset(self, collection_class):
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attr = self.value_attr
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_getter = operator.attrgetter(attr)
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def getter(target):
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return _getter(target) if target is not None else None
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if collection_class is dict:
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def setter(o, k, v):
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setattr(o, attr, v)
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else:
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def setter(o, v):
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setattr(o, attr, v)
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return getter, setter
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def __repr__(self):
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return "AssociationProxy(%r, %r)" % (
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self.target_collection,
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self.value_attr,
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)
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class AssociationProxyInstance(object):
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"""A per-class object that serves class- and object-specific results.
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This is used by :class:`.AssociationProxy` when it is invoked
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in terms of a specific class or instance of a class, i.e. when it is
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used as a regular Python descriptor.
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When referring to the :class:`.AssociationProxy` as a normal Python
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descriptor, the :class:`.AssociationProxyInstance` is the object that
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actually serves the information. Under normal circumstances, its presence
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is transparent::
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>>> User.keywords.scalar
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False
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In the special case that the :class:`.AssociationProxy` object is being
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accessed directly, in order to get an explicit handle to the
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:class:`.AssociationProxyInstance`, use the
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:meth:`.AssociationProxy.for_class` method::
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proxy_state = inspect(User).all_orm_descriptors["keywords"].for_class(User)
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# view if proxy object is scalar or not
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>>> proxy_state.scalar
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False
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.. versionadded:: 1.3
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""" # noqa
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def __init__(self, parent, owning_class, target_class, value_attr):
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self.parent = parent
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self.key = parent.key
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self.owning_class = owning_class
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self.target_collection = parent.target_collection
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self.collection_class = None
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self.target_class = target_class
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self.value_attr = value_attr
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target_class = None
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"""The intermediary class handled by this
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:class:`.AssociationProxyInstance`.
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Intercepted append/set/assignment events will result
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in the generation of new instances of this class.
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"""
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@classmethod
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def for_proxy(cls, parent, owning_class, parent_instance):
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target_collection = parent.target_collection
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value_attr = parent.value_attr
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prop = orm.class_mapper(owning_class).get_property(target_collection)
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# this was never asserted before but this should be made clear.
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if not isinstance(prop, orm.RelationshipProperty):
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util.raise_(
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NotImplementedError(
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"association proxy to a non-relationship "
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"intermediary is not supported"
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),
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replace_context=None,
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)
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target_class = prop.mapper.class_
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try:
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target_assoc = cls._cls_unwrap_target_assoc_proxy(
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target_class, value_attr
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)
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except AttributeError:
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# the proxied attribute doesn't exist on the target class;
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# return an "ambiguous" instance that will work on a per-object
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# basis
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return AmbiguousAssociationProxyInstance(
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parent, owning_class, target_class, value_attr
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)
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except Exception as err:
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util.raise_(
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exc.InvalidRequestError(
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"Association proxy received an unexpected error when "
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"trying to retreive attribute "
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'"%s.%s" from '
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'class "%s": %s'
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% (
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target_class.__name__,
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parent.value_attr,
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target_class.__name__,
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err,
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)
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),
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from_=err,
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)
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else:
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return cls._construct_for_assoc(
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target_assoc, parent, owning_class, target_class, value_attr
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)
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@classmethod
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def _construct_for_assoc(
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cls, target_assoc, parent, owning_class, target_class, value_attr
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):
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if target_assoc is not None:
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return ObjectAssociationProxyInstance(
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parent, owning_class, target_class, value_attr
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)
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attr = getattr(target_class, value_attr)
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if not hasattr(attr, "_is_internal_proxy"):
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return AmbiguousAssociationProxyInstance(
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parent, owning_class, target_class, value_attr
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)
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is_object = attr._impl_uses_objects
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if is_object:
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return ObjectAssociationProxyInstance(
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parent, owning_class, target_class, value_attr
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)
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else:
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return ColumnAssociationProxyInstance(
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parent, owning_class, target_class, value_attr
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)
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def _get_property(self):
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return orm.class_mapper(self.owning_class).get_property(
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self.target_collection
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)
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@property
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def _comparator(self):
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return self._get_property().comparator
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def __clause_element__(self):
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raise NotImplementedError(
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"The association proxy can't be used as a plain column "
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"expression; it only works inside of a comparison expression"
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)
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@classmethod
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def _cls_unwrap_target_assoc_proxy(cls, target_class, value_attr):
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attr = getattr(target_class, value_attr)
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if isinstance(attr, (AssociationProxy, AssociationProxyInstance)):
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return attr
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return None
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@util.memoized_property
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def _unwrap_target_assoc_proxy(self):
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return self._cls_unwrap_target_assoc_proxy(
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self.target_class, self.value_attr
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)
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@property
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def remote_attr(self):
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"""The 'remote' class attribute referenced by this
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:class:`.AssociationProxyInstance`.
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.. seealso::
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:attr:`.AssociationProxyInstance.attr`
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:attr:`.AssociationProxyInstance.local_attr`
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"""
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return getattr(self.target_class, self.value_attr)
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|
|
@property
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def local_attr(self):
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"""The 'local' class attribute referenced by this
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:class:`.AssociationProxyInstance`.
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|
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|
.. seealso::
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:attr:`.AssociationProxyInstance.attr`
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:attr:`.AssociationProxyInstance.remote_attr`
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"""
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return getattr(self.owning_class, self.target_collection)
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|
|
@property
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def attr(self):
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"""Return a tuple of ``(local_attr, remote_attr)``.
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|
|
This attribute was originally intended to facilitate using the
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:meth:`_query.Query.join` method to join across the two relationships
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at once, however this makes use of a deprecated calling style.
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To use :meth:`_sql.select.join` or :meth:`_orm.Query.join` with
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an association proxy, the current method is to make use of the
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:attr:`.AssociationProxyInstance.local_attr` and
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:attr:`.AssociationProxyInstance.remote_attr` attributes separately::
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stmt = (
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select(Parent).
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join(Parent.proxied.local_attr).
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join(Parent.proxied.remote_attr)
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)
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|
A future release may seek to provide a more succinct join pattern
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for association proxy attributes.
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|
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|
.. seealso::
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|
:attr:`.AssociationProxyInstance.local_attr`
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:attr:`.AssociationProxyInstance.remote_attr`
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"""
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return (self.local_attr, self.remote_attr)
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|
|
@util.memoized_property
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def scalar(self):
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"""Return ``True`` if this :class:`.AssociationProxyInstance`
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proxies a scalar relationship on the local side."""
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scalar = not self._get_property().uselist
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if scalar:
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self._initialize_scalar_accessors()
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return scalar
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|
|
@util.memoized_property
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|
def _value_is_scalar(self):
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return (
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not self._get_property()
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.mapper.get_property(self.value_attr)
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.uselist
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)
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@property
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def _target_is_object(self):
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raise NotImplementedError()
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|
def _initialize_scalar_accessors(self):
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if self.parent.getset_factory:
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get, set_ = self.parent.getset_factory(None, self)
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else:
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get, set_ = self.parent._default_getset(None)
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self._scalar_get, self._scalar_set = get, set_
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|
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def _default_getset(self, collection_class):
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attr = self.value_attr
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|
_getter = operator.attrgetter(attr)
|
|
|
|
def getter(target):
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return _getter(target) if target is not None else None
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|
|
if collection_class is dict:
|
|
|
|
def setter(o, k, v):
|
|
return setattr(o, attr, v)
|
|
|
|
else:
|
|
|
|
def setter(o, v):
|
|
return setattr(o, attr, v)
|
|
|
|
return getter, setter
|
|
|
|
@property
|
|
def info(self):
|
|
return self.parent.info
|
|
|
|
def get(self, obj):
|
|
if obj is None:
|
|
return self
|
|
|
|
if self.scalar:
|
|
target = getattr(obj, self.target_collection)
|
|
return self._scalar_get(target)
|
|
else:
|
|
try:
|
|
# If the owning instance is reborn (orm session resurrect,
|
|
# etc.), refresh the proxy cache.
|
|
creator_id, self_id, proxy = getattr(obj, self.key)
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
if id(obj) == creator_id and id(self) == self_id:
|
|
assert self.collection_class is not None
|
|
return proxy
|
|
|
|
self.collection_class, proxy = self._new(
|
|
_lazy_collection(obj, self.target_collection)
|
|
)
|
|
setattr(obj, self.key, (id(obj), id(self), proxy))
|
|
return proxy
|
|
|
|
def set(self, obj, values):
|
|
if self.scalar:
|
|
creator = (
|
|
self.parent.creator
|
|
if self.parent.creator
|
|
else self.target_class
|
|
)
|
|
target = getattr(obj, self.target_collection)
|
|
if target is None:
|
|
if values is None:
|
|
return
|
|
setattr(obj, self.target_collection, creator(values))
|
|
else:
|
|
self._scalar_set(target, values)
|
|
if values is None and self.parent.cascade_scalar_deletes:
|
|
setattr(obj, self.target_collection, None)
|
|
else:
|
|
proxy = self.get(obj)
|
|
assert self.collection_class is not None
|
|
if proxy is not values:
|
|
proxy._bulk_replace(self, values)
|
|
|
|
def delete(self, obj):
|
|
if self.owning_class is None:
|
|
self._calc_owner(obj, None)
|
|
|
|
if self.scalar:
|
|
target = getattr(obj, self.target_collection)
|
|
if target is not None:
|
|
delattr(target, self.value_attr)
|
|
delattr(obj, self.target_collection)
|
|
|
|
def _new(self, lazy_collection):
|
|
creator = (
|
|
self.parent.creator if self.parent.creator else self.target_class
|
|
)
|
|
collection_class = util.duck_type_collection(lazy_collection())
|
|
|
|
if self.parent.proxy_factory:
|
|
return (
|
|
collection_class,
|
|
self.parent.proxy_factory(
|
|
lazy_collection, creator, self.value_attr, self
|
|
),
|
|
)
|
|
|
|
if self.parent.getset_factory:
|
|
getter, setter = self.parent.getset_factory(collection_class, self)
|
|
else:
|
|
getter, setter = self.parent._default_getset(collection_class)
|
|
|
|
if collection_class is list:
|
|
return (
|
|
collection_class,
|
|
_AssociationList(
|
|
lazy_collection, creator, getter, setter, self
|
|
),
|
|
)
|
|
elif collection_class is dict:
|
|
return (
|
|
collection_class,
|
|
_AssociationDict(
|
|
lazy_collection, creator, getter, setter, self
|
|
),
|
|
)
|
|
elif collection_class is set:
|
|
return (
|
|
collection_class,
|
|
_AssociationSet(
|
|
lazy_collection, creator, getter, setter, self
|
|
),
|
|
)
|
|
else:
|
|
raise exc.ArgumentError(
|
|
"could not guess which interface to use for "
|
|
'collection_class "%s" backing "%s"; specify a '
|
|
"proxy_factory and proxy_bulk_set manually"
|
|
% (self.collection_class.__name__, self.target_collection)
|
|
)
|
|
|
|
def _set(self, proxy, values):
|
|
if self.parent.proxy_bulk_set:
|
|
self.parent.proxy_bulk_set(proxy, values)
|
|
elif self.collection_class is list:
|
|
proxy.extend(values)
|
|
elif self.collection_class is dict:
|
|
proxy.update(values)
|
|
elif self.collection_class is set:
|
|
proxy.update(values)
|
|
else:
|
|
raise exc.ArgumentError(
|
|
"no proxy_bulk_set supplied for custom "
|
|
"collection_class implementation"
|
|
)
|
|
|
|
def _inflate(self, proxy):
|
|
creator = (
|
|
self.parent.creator and self.parent.creator or self.target_class
|
|
)
|
|
|
|
if self.parent.getset_factory:
|
|
getter, setter = self.parent.getset_factory(
|
|
self.collection_class, self
|
|
)
|
|
else:
|
|
getter, setter = self.parent._default_getset(self.collection_class)
|
|
|
|
proxy.creator = creator
|
|
proxy.getter = getter
|
|
proxy.setter = setter
|
|
|
|
def _criterion_exists(self, criterion=None, **kwargs):
|
|
is_has = kwargs.pop("is_has", None)
|
|
|
|
target_assoc = self._unwrap_target_assoc_proxy
|
|
if target_assoc is not None:
|
|
inner = target_assoc._criterion_exists(
|
|
criterion=criterion, **kwargs
|
|
)
|
|
return self._comparator._criterion_exists(inner)
|
|
|
|
if self._target_is_object:
|
|
prop = getattr(self.target_class, self.value_attr)
|
|
value_expr = prop._criterion_exists(criterion, **kwargs)
|
|
else:
|
|
if kwargs:
|
|
raise exc.ArgumentError(
|
|
"Can't apply keyword arguments to column-targeted "
|
|
"association proxy; use =="
|
|
)
|
|
elif is_has and criterion is not None:
|
|
raise exc.ArgumentError(
|
|
"Non-empty has() not allowed for "
|
|
"column-targeted association proxy; use =="
|
|
)
|
|
|
|
value_expr = criterion
|
|
|
|
return self._comparator._criterion_exists(value_expr)
|
|
|
|
def any(self, criterion=None, **kwargs):
|
|
"""Produce a proxied 'any' expression using EXISTS.
|
|
|
|
This expression will be a composed product
|
|
using the :meth:`.RelationshipProperty.Comparator.any`
|
|
and/or :meth:`.RelationshipProperty.Comparator.has`
|
|
operators of the underlying proxied attributes.
|
|
|
|
"""
|
|
if self._unwrap_target_assoc_proxy is None and (
|
|
self.scalar
|
|
and (not self._target_is_object or self._value_is_scalar)
|
|
):
|
|
raise exc.InvalidRequestError(
|
|
"'any()' not implemented for scalar " "attributes. Use has()."
|
|
)
|
|
return self._criterion_exists(
|
|
criterion=criterion, is_has=False, **kwargs
|
|
)
|
|
|
|
def has(self, criterion=None, **kwargs):
|
|
"""Produce a proxied 'has' expression using EXISTS.
|
|
|
|
This expression will be a composed product
|
|
using the :meth:`.RelationshipProperty.Comparator.any`
|
|
and/or :meth:`.RelationshipProperty.Comparator.has`
|
|
operators of the underlying proxied attributes.
|
|
|
|
"""
|
|
if self._unwrap_target_assoc_proxy is None and (
|
|
not self.scalar
|
|
or (self._target_is_object and not self._value_is_scalar)
|
|
):
|
|
raise exc.InvalidRequestError(
|
|
"'has()' not implemented for collections. " "Use any()."
|
|
)
|
|
return self._criterion_exists(
|
|
criterion=criterion, is_has=True, **kwargs
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "%s(%r)" % (self.__class__.__name__, self.parent)
|
|
|
|
|
|
class AmbiguousAssociationProxyInstance(AssociationProxyInstance):
|
|
"""an :class:`.AssociationProxyInstance` where we cannot determine
|
|
the type of target object.
|
|
"""
|
|
|
|
_is_canonical = False
|
|
|
|
def _ambiguous(self):
|
|
raise AttributeError(
|
|
"Association proxy %s.%s refers to an attribute '%s' that is not "
|
|
"directly mapped on class %s; therefore this operation cannot "
|
|
"proceed since we don't know what type of object is referred "
|
|
"towards"
|
|
% (
|
|
self.owning_class.__name__,
|
|
self.target_collection,
|
|
self.value_attr,
|
|
self.target_class,
|
|
)
|
|
)
|
|
|
|
def get(self, obj):
|
|
if obj is None:
|
|
return self
|
|
else:
|
|
return super(AmbiguousAssociationProxyInstance, self).get(obj)
|
|
|
|
def __eq__(self, obj):
|
|
self._ambiguous()
|
|
|
|
def __ne__(self, obj):
|
|
self._ambiguous()
|
|
|
|
def any(self, criterion=None, **kwargs):
|
|
self._ambiguous()
|
|
|
|
def has(self, criterion=None, **kwargs):
|
|
self._ambiguous()
|
|
|
|
@util.memoized_property
|
|
def _lookup_cache(self):
|
|
# mapping of <subclass>->AssociationProxyInstance.
|
|
# e.g. proxy is A-> A.b -> B -> B.b_attr, but B.b_attr doesn't exist;
|
|
# only B1(B) and B2(B) have "b_attr", keys in here would be B1, B2
|
|
return {}
|
|
|
|
def _non_canonical_get_for_object(self, parent_instance):
|
|
if parent_instance is not None:
|
|
actual_obj = getattr(parent_instance, self.target_collection)
|
|
if actual_obj is not None:
|
|
try:
|
|
insp = inspect(actual_obj)
|
|
except exc.NoInspectionAvailable:
|
|
pass
|
|
else:
|
|
mapper = insp.mapper
|
|
instance_class = mapper.class_
|
|
if instance_class not in self._lookup_cache:
|
|
self._populate_cache(instance_class, mapper)
|
|
|
|
try:
|
|
return self._lookup_cache[instance_class]
|
|
except KeyError:
|
|
pass
|
|
|
|
# no object or ambiguous object given, so return "self", which
|
|
# is a proxy with generally only instance-level functionality
|
|
return self
|
|
|
|
def _populate_cache(self, instance_class, mapper):
|
|
prop = orm.class_mapper(self.owning_class).get_property(
|
|
self.target_collection
|
|
)
|
|
|
|
if mapper.isa(prop.mapper):
|
|
target_class = instance_class
|
|
try:
|
|
target_assoc = self._cls_unwrap_target_assoc_proxy(
|
|
target_class, self.value_attr
|
|
)
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
self._lookup_cache[instance_class] = self._construct_for_assoc(
|
|
target_assoc,
|
|
self.parent,
|
|
self.owning_class,
|
|
target_class,
|
|
self.value_attr,
|
|
)
|
|
|
|
|
|
class ObjectAssociationProxyInstance(AssociationProxyInstance):
|
|
"""an :class:`.AssociationProxyInstance` that has an object as a target."""
|
|
|
|
_target_is_object = True
|
|
_is_canonical = True
|
|
|
|
def contains(self, obj):
|
|
"""Produce a proxied 'contains' expression using EXISTS.
|
|
|
|
This expression will be a composed product
|
|
using the :meth:`.RelationshipProperty.Comparator.any`,
|
|
:meth:`.RelationshipProperty.Comparator.has`,
|
|
and/or :meth:`.RelationshipProperty.Comparator.contains`
|
|
operators of the underlying proxied attributes.
|
|
"""
|
|
|
|
target_assoc = self._unwrap_target_assoc_proxy
|
|
if target_assoc is not None:
|
|
return self._comparator._criterion_exists(
|
|
target_assoc.contains(obj)
|
|
if not target_assoc.scalar
|
|
else target_assoc == obj
|
|
)
|
|
elif (
|
|
self._target_is_object
|
|
and self.scalar
|
|
and not self._value_is_scalar
|
|
):
|
|
return self._comparator.has(
|
|
getattr(self.target_class, self.value_attr).contains(obj)
|
|
)
|
|
elif self._target_is_object and self.scalar and self._value_is_scalar:
|
|
raise exc.InvalidRequestError(
|
|
"contains() doesn't apply to a scalar object endpoint; use =="
|
|
)
|
|
else:
|
|
|
|
return self._comparator._criterion_exists(**{self.value_attr: obj})
|
|
|
|
def __eq__(self, obj):
|
|
# note the has() here will fail for collections; eq_()
|
|
# is only allowed with a scalar.
|
|
if obj is None:
|
|
return or_(
|
|
self._comparator.has(**{self.value_attr: obj}),
|
|
self._comparator == None,
|
|
)
|
|
else:
|
|
return self._comparator.has(**{self.value_attr: obj})
|
|
|
|
def __ne__(self, obj):
|
|
# note the has() here will fail for collections; eq_()
|
|
# is only allowed with a scalar.
|
|
return self._comparator.has(
|
|
getattr(self.target_class, self.value_attr) != obj
|
|
)
|
|
|
|
|
|
class ColumnAssociationProxyInstance(
|
|
ColumnOperators, AssociationProxyInstance
|
|
):
|
|
"""an :class:`.AssociationProxyInstance` that has a database column as a
|
|
target.
|
|
"""
|
|
|
|
_target_is_object = False
|
|
_is_canonical = True
|
|
|
|
def __eq__(self, other):
|
|
# special case "is None" to check for no related row as well
|
|
expr = self._criterion_exists(
|
|
self.remote_attr.operate(operator.eq, other)
|
|
)
|
|
if other is None:
|
|
return or_(expr, self._comparator == None)
|
|
else:
|
|
return expr
|
|
|
|
def operate(self, op, *other, **kwargs):
|
|
return self._criterion_exists(
|
|
self.remote_attr.operate(op, *other, **kwargs)
|
|
)
|
|
|
|
|
|
class _lazy_collection(object):
|
|
def __init__(self, obj, target):
|
|
self.parent = obj
|
|
self.target = target
|
|
|
|
def __call__(self):
|
|
return getattr(self.parent, self.target)
|
|
|
|
def __getstate__(self):
|
|
return {"obj": self.parent, "target": self.target}
|
|
|
|
def __setstate__(self, state):
|
|
self.parent = state["obj"]
|
|
self.target = state["target"]
|
|
|
|
|
|
class _AssociationCollection(object):
|
|
def __init__(self, lazy_collection, creator, getter, setter, parent):
|
|
"""Constructs an _AssociationCollection.
|
|
|
|
This will always be a subclass of either _AssociationList,
|
|
_AssociationSet, or _AssociationDict.
|
|
|
|
lazy_collection
|
|
A callable returning a list-based collection of entities (usually an
|
|
object attribute managed by a SQLAlchemy relationship())
|
|
|
|
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.
|
|
|
|
"""
|
|
self.lazy_collection = lazy_collection
|
|
self.creator = creator
|
|
self.getter = getter
|
|
self.setter = setter
|
|
self.parent = parent
|
|
|
|
col = property(lambda self: self.lazy_collection())
|
|
|
|
def __len__(self):
|
|
return len(self.col)
|
|
|
|
def __bool__(self):
|
|
return bool(self.col)
|
|
|
|
__nonzero__ = __bool__
|
|
|
|
def __getstate__(self):
|
|
return {"parent": self.parent, "lazy_collection": self.lazy_collection}
|
|
|
|
def __setstate__(self, state):
|
|
self.parent = state["parent"]
|
|
self.lazy_collection = state["lazy_collection"]
|
|
self.parent._inflate(self)
|
|
|
|
def _bulk_replace(self, assoc_proxy, values):
|
|
self.clear()
|
|
assoc_proxy._set(self, values)
|
|
|
|
|
|
class _AssociationList(_AssociationCollection):
|
|
"""Generic, converting, list-to-list proxy."""
|
|
|
|
def _create(self, value):
|
|
return self.creator(value)
|
|
|
|
def _get(self, object_):
|
|
return self.getter(object_)
|
|
|
|
def _set(self, object_, value):
|
|
return self.setter(object_, value)
|
|
|
|
def __getitem__(self, index):
|
|
if not isinstance(index, slice):
|
|
return self._get(self.col[index])
|
|
else:
|
|
return [self._get(member) for member in self.col[index]]
|
|
|
|
def __setitem__(self, index, value):
|
|
if not isinstance(index, slice):
|
|
self._set(self.col[index], value)
|
|
else:
|
|
if index.stop is None:
|
|
stop = len(self)
|
|
elif index.stop < 0:
|
|
stop = len(self) + index.stop
|
|
else:
|
|
stop = index.stop
|
|
step = index.step or 1
|
|
|
|
start = index.start or 0
|
|
rng = list(range(index.start or 0, stop, step))
|
|
if step == 1:
|
|
for i in rng:
|
|
del self[start]
|
|
i = start
|
|
for item in value:
|
|
self.insert(i, item)
|
|
i += 1
|
|
else:
|
|
if len(value) != len(rng):
|
|
raise ValueError(
|
|
"attempt to assign sequence of size %s to "
|
|
"extended slice of size %s" % (len(value), len(rng))
|
|
)
|
|
for i, item in zip(rng, value):
|
|
self._set(self.col[i], item)
|
|
|
|
def __delitem__(self, index):
|
|
del self.col[index]
|
|
|
|
def __contains__(self, value):
|
|
for member in self.col:
|
|
# testlib.pragma exempt:__eq__
|
|
if self._get(member) == value:
|
|
return True
|
|
return False
|
|
|
|
def __getslice__(self, start, end):
|
|
return [self._get(member) for member in self.col[start:end]]
|
|
|
|
def __setslice__(self, start, end, values):
|
|
members = [self._create(v) for v in values]
|
|
self.col[start:end] = members
|
|
|
|
def __delslice__(self, start, end):
|
|
del self.col[start:end]
|
|
|
|
def __iter__(self):
|
|
"""Iterate over proxied values.
|
|
|
|
For the actual domain objects, iterate over .col instead or
|
|
just use the underlying collection directly from its property
|
|
on the parent.
|
|
"""
|
|
|
|
for member in self.col:
|
|
yield self._get(member)
|
|
return
|
|
|
|
def append(self, value):
|
|
col = self.col
|
|
item = self._create(value)
|
|
col.append(item)
|
|
|
|
def count(self, value):
|
|
return sum(
|
|
[
|
|
1
|
|
for _ in util.itertools_filter(
|
|
lambda v: v == value, iter(self)
|
|
)
|
|
]
|
|
)
|
|
|
|
def extend(self, values):
|
|
for v in values:
|
|
self.append(v)
|
|
|
|
def insert(self, index, value):
|
|
self.col[index:index] = [self._create(value)]
|
|
|
|
def pop(self, index=-1):
|
|
return self.getter(self.col.pop(index))
|
|
|
|
def remove(self, value):
|
|
for i, val in enumerate(self):
|
|
if val == value:
|
|
del self.col[i]
|
|
return
|
|
raise ValueError("value not in list")
|
|
|
|
def reverse(self):
|
|
"""Not supported, use reversed(mylist)"""
|
|
|
|
raise NotImplementedError
|
|
|
|
def sort(self):
|
|
"""Not supported, use sorted(mylist)"""
|
|
|
|
raise NotImplementedError
|
|
|
|
def clear(self):
|
|
del self.col[0 : len(self.col)]
|
|
|
|
def __eq__(self, other):
|
|
return list(self) == other
|
|
|
|
def __ne__(self, other):
|
|
return list(self) != other
|
|
|
|
def __lt__(self, other):
|
|
return list(self) < other
|
|
|
|
def __le__(self, other):
|
|
return list(self) <= other
|
|
|
|
def __gt__(self, other):
|
|
return list(self) > other
|
|
|
|
def __ge__(self, other):
|
|
return list(self) >= other
|
|
|
|
def __cmp__(self, other):
|
|
return util.cmp(list(self), other)
|
|
|
|
def __add__(self, iterable):
|
|
try:
|
|
other = list(iterable)
|
|
except TypeError:
|
|
return NotImplemented
|
|
return list(self) + other
|
|
|
|
def __radd__(self, iterable):
|
|
try:
|
|
other = list(iterable)
|
|
except TypeError:
|
|
return NotImplemented
|
|
return other + list(self)
|
|
|
|
def __mul__(self, n):
|
|
if not isinstance(n, int):
|
|
return NotImplemented
|
|
return list(self) * n
|
|
|
|
__rmul__ = __mul__
|
|
|
|
def __iadd__(self, iterable):
|
|
self.extend(iterable)
|
|
return self
|
|
|
|
def __imul__(self, n):
|
|
# unlike a regular list *=, proxied __imul__ will generate unique
|
|
# backing objects for each copy. *= on proxied lists is a bit of
|
|
# a stretch anyhow, and this interpretation of the __imul__ contract
|
|
# is more plausibly useful than copying the backing objects.
|
|
if not isinstance(n, int):
|
|
return NotImplemented
|
|
if n == 0:
|
|
self.clear()
|
|
elif n > 1:
|
|
self.extend(list(self) * (n - 1))
|
|
return self
|
|
|
|
def index(self, item, *args):
|
|
return list(self).index(item, *args)
|
|
|
|
def copy(self):
|
|
return list(self)
|
|
|
|
def __repr__(self):
|
|
return repr(list(self))
|
|
|
|
def __hash__(self):
|
|
raise TypeError("%s objects are unhashable" % type(self).__name__)
|
|
|
|
for func_name, func in list(locals().items()):
|
|
if (
|
|
callable(func)
|
|
and func.__name__ == func_name
|
|
and not func.__doc__
|
|
and hasattr(list, func_name)
|
|
):
|
|
func.__doc__ = getattr(list, func_name).__doc__
|
|
del func_name, func
|
|
|
|
|
|
_NotProvided = util.symbol("_NotProvided")
|
|
|
|
|
|
class _AssociationDict(_AssociationCollection):
|
|
"""Generic, converting, dict-to-dict proxy."""
|
|
|
|
def _create(self, key, value):
|
|
return self.creator(key, value)
|
|
|
|
def _get(self, object_):
|
|
return self.getter(object_)
|
|
|
|
def _set(self, object_, key, value):
|
|
return self.setter(object_, key, value)
|
|
|
|
def __getitem__(self, key):
|
|
return self._get(self.col[key])
|
|
|
|
def __setitem__(self, key, value):
|
|
if key in self.col:
|
|
self._set(self.col[key], key, value)
|
|
else:
|
|
self.col[key] = self._create(key, value)
|
|
|
|
def __delitem__(self, key):
|
|
del self.col[key]
|
|
|
|
def __contains__(self, key):
|
|
# testlib.pragma exempt:__hash__
|
|
return key in self.col
|
|
|
|
def has_key(self, key):
|
|
# testlib.pragma exempt:__hash__
|
|
return key in self.col
|
|
|
|
def __iter__(self):
|
|
return iter(self.col.keys())
|
|
|
|
def clear(self):
|
|
self.col.clear()
|
|
|
|
def __eq__(self, other):
|
|
return dict(self) == other
|
|
|
|
def __ne__(self, other):
|
|
return dict(self) != other
|
|
|
|
def __lt__(self, other):
|
|
return dict(self) < other
|
|
|
|
def __le__(self, other):
|
|
return dict(self) <= other
|
|
|
|
def __gt__(self, other):
|
|
return dict(self) > other
|
|
|
|
def __ge__(self, other):
|
|
return dict(self) >= other
|
|
|
|
def __cmp__(self, other):
|
|
return util.cmp(dict(self), other)
|
|
|
|
def __repr__(self):
|
|
return repr(dict(self.items()))
|
|
|
|
def get(self, key, default=None):
|
|
try:
|
|
return self[key]
|
|
except KeyError:
|
|
return default
|
|
|
|
def setdefault(self, key, default=None):
|
|
if key not in self.col:
|
|
self.col[key] = self._create(key, default)
|
|
return default
|
|
else:
|
|
return self[key]
|
|
|
|
def keys(self):
|
|
return self.col.keys()
|
|
|
|
if util.py2k:
|
|
|
|
def iteritems(self):
|
|
return ((key, self._get(self.col[key])) for key in self.col)
|
|
|
|
def itervalues(self):
|
|
return (self._get(self.col[key]) for key in self.col)
|
|
|
|
def iterkeys(self):
|
|
return self.col.iterkeys()
|
|
|
|
def values(self):
|
|
return [self._get(member) for member in self.col.values()]
|
|
|
|
def items(self):
|
|
return [(k, self._get(self.col[k])) for k in self]
|
|
|
|
else:
|
|
|
|
def items(self):
|
|
return ((key, self._get(self.col[key])) for key in self.col)
|
|
|
|
def values(self):
|
|
return (self._get(self.col[key]) for key in self.col)
|
|
|
|
def pop(self, key, default=_NotProvided):
|
|
if default is _NotProvided:
|
|
member = self.col.pop(key)
|
|
else:
|
|
member = self.col.pop(key, default)
|
|
return self._get(member)
|
|
|
|
def popitem(self):
|
|
item = self.col.popitem()
|
|
return (item[0], self._get(item[1]))
|
|
|
|
def update(self, *a, **kw):
|
|
if len(a) > 1:
|
|
raise TypeError(
|
|
"update expected at most 1 arguments, got %i" % len(a)
|
|
)
|
|
elif len(a) == 1:
|
|
seq_or_map = a[0]
|
|
# discern dict from sequence - took the advice from
|
|
# https://www.voidspace.org.uk/python/articles/duck_typing.shtml
|
|
# still not perfect :(
|
|
if hasattr(seq_or_map, "keys"):
|
|
for item in seq_or_map:
|
|
self[item] = seq_or_map[item]
|
|
else:
|
|
try:
|
|
for k, v in seq_or_map:
|
|
self[k] = v
|
|
except ValueError as err:
|
|
util.raise_(
|
|
ValueError(
|
|
"dictionary update sequence "
|
|
"requires 2-element tuples"
|
|
),
|
|
replace_context=err,
|
|
)
|
|
|
|
for key, value in kw:
|
|
self[key] = value
|
|
|
|
def _bulk_replace(self, assoc_proxy, values):
|
|
existing = set(self)
|
|
constants = existing.intersection(values or ())
|
|
additions = set(values or ()).difference(constants)
|
|
removals = existing.difference(constants)
|
|
|
|
for key, member in values.items() or ():
|
|
if key in additions:
|
|
self[key] = member
|
|
elif key in constants:
|
|
self[key] = member
|
|
|
|
for key in removals:
|
|
del self[key]
|
|
|
|
def copy(self):
|
|
return dict(self.items())
|
|
|
|
def __hash__(self):
|
|
raise TypeError("%s objects are unhashable" % type(self).__name__)
|
|
|
|
for func_name, func in list(locals().items()):
|
|
if (
|
|
callable(func)
|
|
and func.__name__ == func_name
|
|
and not func.__doc__
|
|
and hasattr(dict, func_name)
|
|
):
|
|
func.__doc__ = getattr(dict, func_name).__doc__
|
|
del func_name, func
|
|
|
|
|
|
class _AssociationSet(_AssociationCollection):
|
|
"""Generic, converting, set-to-set proxy."""
|
|
|
|
def _create(self, value):
|
|
return self.creator(value)
|
|
|
|
def _get(self, object_):
|
|
return self.getter(object_)
|
|
|
|
def __len__(self):
|
|
return len(self.col)
|
|
|
|
def __bool__(self):
|
|
if self.col:
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
__nonzero__ = __bool__
|
|
|
|
def __contains__(self, value):
|
|
for member in self.col:
|
|
# testlib.pragma exempt:__eq__
|
|
if self._get(member) == value:
|
|
return True
|
|
return False
|
|
|
|
def __iter__(self):
|
|
"""Iterate over proxied values.
|
|
|
|
For the actual domain objects, iterate over .col instead or just use
|
|
the underlying collection directly from its property on the parent.
|
|
|
|
"""
|
|
for member in self.col:
|
|
yield self._get(member)
|
|
return
|
|
|
|
def add(self, value):
|
|
if value not in self:
|
|
self.col.add(self._create(value))
|
|
|
|
# for discard and remove, choosing a more expensive check strategy rather
|
|
# than call self.creator()
|
|
def discard(self, value):
|
|
for member in self.col:
|
|
if self._get(member) == value:
|
|
self.col.discard(member)
|
|
break
|
|
|
|
def remove(self, value):
|
|
for member in self.col:
|
|
if self._get(member) == value:
|
|
self.col.discard(member)
|
|
return
|
|
raise KeyError(value)
|
|
|
|
def pop(self):
|
|
if not self.col:
|
|
raise KeyError("pop from an empty set")
|
|
member = self.col.pop()
|
|
return self._get(member)
|
|
|
|
def update(self, other):
|
|
for value in other:
|
|
self.add(value)
|
|
|
|
def _bulk_replace(self, assoc_proxy, values):
|
|
existing = set(self)
|
|
constants = existing.intersection(values or ())
|
|
additions = set(values or ()).difference(constants)
|
|
removals = existing.difference(constants)
|
|
|
|
appender = self.add
|
|
remover = self.remove
|
|
|
|
for member in values or ():
|
|
if member in additions:
|
|
appender(member)
|
|
elif member in constants:
|
|
appender(member)
|
|
|
|
for member in removals:
|
|
remover(member)
|
|
|
|
def __ior__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
for value in other:
|
|
self.add(value)
|
|
return self
|
|
|
|
def _set(self):
|
|
return set(iter(self))
|
|
|
|
def union(self, other):
|
|
return set(self).union(other)
|
|
|
|
__or__ = union
|
|
|
|
def difference(self, other):
|
|
return set(self).difference(other)
|
|
|
|
__sub__ = difference
|
|
|
|
def difference_update(self, other):
|
|
for value in other:
|
|
self.discard(value)
|
|
|
|
def __isub__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
for value in other:
|
|
self.discard(value)
|
|
return self
|
|
|
|
def intersection(self, other):
|
|
return set(self).intersection(other)
|
|
|
|
__and__ = intersection
|
|
|
|
def intersection_update(self, other):
|
|
want, have = self.intersection(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
|
|
def __iand__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
want, have = self.intersection(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
return self
|
|
|
|
def symmetric_difference(self, other):
|
|
return set(self).symmetric_difference(other)
|
|
|
|
__xor__ = symmetric_difference
|
|
|
|
def symmetric_difference_update(self, other):
|
|
want, have = self.symmetric_difference(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
|
|
def __ixor__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
want, have = self.symmetric_difference(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
return self
|
|
|
|
def issubset(self, other):
|
|
return set(self).issubset(other)
|
|
|
|
def issuperset(self, other):
|
|
return set(self).issuperset(other)
|
|
|
|
def clear(self):
|
|
self.col.clear()
|
|
|
|
def copy(self):
|
|
return set(self)
|
|
|
|
def __eq__(self, other):
|
|
return set(self) == other
|
|
|
|
def __ne__(self, other):
|
|
return set(self) != other
|
|
|
|
def __lt__(self, other):
|
|
return set(self) < other
|
|
|
|
def __le__(self, other):
|
|
return set(self) <= other
|
|
|
|
def __gt__(self, other):
|
|
return set(self) > other
|
|
|
|
def __ge__(self, other):
|
|
return set(self) >= other
|
|
|
|
def __repr__(self):
|
|
return repr(set(self))
|
|
|
|
def __hash__(self):
|
|
raise TypeError("%s objects are unhashable" % type(self).__name__)
|
|
|
|
for func_name, func in list(locals().items()):
|
|
if (
|
|
callable(func)
|
|
and func.__name__ == func_name
|
|
and not func.__doc__
|
|
and hasattr(set, func_name)
|
|
):
|
|
func.__doc__ = getattr(set, func_name).__doc__
|
|
del func_name, func
|