Python collection.appender方法代码示例

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def _assert_required_roles(cls, roles, methods):
    """ensure all roles are present, and apply implicit instrumentation if
    needed

    """
    if 'appender' not in roles or not hasattr(cls, roles['appender']):
        raise sa_exc.ArgumentError(
            "Type %s must elect an appender method to be "
            "a collection class" % cls.__name__)
    elif (roles['appender'] not in methods and
          not hasattr(getattr(cls, roles['appender']), '_sa_instrumented')):
        methods[roles['appender']] = ('fire_append_event', 1, None)

    if 'remover' not in roles or not hasattr(cls, roles['remover']):
        raise sa_exc.ArgumentError(
            "Type %s must elect a remover method to be "
            "a collection class" % cls.__name__)
    elif (roles['remover'] not in methods and
          not hasattr(getattr(cls, roles['remover']), '_sa_instrumented')):
        methods[roles['remover']] = ('fire_remove_event', 1, None)

    if 'iterator' not in roles or not hasattr(cls, roles['iterator']):
        raise sa_exc.ArgumentError(
            "Type %s must elect an iterator method to be "
            "a collection class" % cls.__name__) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def test_dict(self):
        assert_raises_message(
            sa_exc.ArgumentError,
            "Type InstrumentedDict must elect an appender "
            "method to be a collection class",
            self._test_adapter,
            dict,
            self.dictable_entity,
            to_set=lambda c: set(c.values()),
        )

        assert_raises_message(
            sa_exc.ArgumentError,
            "Type InstrumentedDict must elect an appender method "
            "to be a collection class",
            self._test_dict,
            dict,
        ) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def test_dict_subclass(self):
        class MyDict(dict):
            @collection.appender
            @collection.internally_instrumented
            def set(self, item, _sa_initiator=None):
                self.__setitem__(item.a, item, _sa_initiator=_sa_initiator)

            @collection.remover
            @collection.internally_instrumented
            def _remove(self, item, _sa_initiator=None):
                self.__delitem__(item.a, _sa_initiator=_sa_initiator)

        self._test_adapter(
            MyDict, self.dictable_entity, to_set=lambda c: set(c.values())
        )
        self._test_dict(MyDict)
        self._test_dict_bulk(MyDict)
        self.assert_(getattr(MyDict, "_sa_instrumented") == id(MyDict)) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def converter(fn):
        """Tag the method as the collection converter.

        This optional method will be called when a collection is being
        replaced entirely, as in::

            myobj.acollection = [newvalue1, newvalue2]

        The converter method will receive the object being assigned and should
        return an iterable of values suitable for use by the ``appender``
        method.  A converter must not assign values or mutate the collection,
        its sole job is to adapt the value the user provides into an iterable
        of values for the ORM's use.

        The default converter implementation will use duck-typing to do the
        conversion.  A dict-like collection will be convert into an iterable
        of dictionary values, and other types will simply be iterated::

            @collection.converter
            def convert(self, other): ...

        If the duck-typing of the object does not match the type of this
        collection, a TypeError is raised.

        Supply an implementation of this method if you want to expand the
        range of possible types that can be assigned in bulk or perform
        validation on the values about to be assigned.

        """
        fn._sa_instrument_role = 'converter'
        return fn 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def append_multiple_without_event(self, items):
        """Add or restore an entity to the collection, firing no events."""
        appender = self._data()._sa_appender
        for item in items:
            appender(item, _sa_initiator=False) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def _locate_roles_and_methods(cls):
    """search for _sa_instrument_role-decorated methods in
    method resolution order, assign to roles.

    """

    roles = {}
    methods = {}

    for supercls in cls.__mro__:
        for name, method in vars(supercls).items():
            if not util.callable(method):
                continue

            # note role declarations
            if hasattr(method, '_sa_instrument_role'):
                role = method._sa_instrument_role
                assert role in ('appender', 'remover', 'iterator',
                                'linker', 'converter')
                roles.setdefault(role, name)

            # transfer instrumentation requests from decorated function
            # to the combined queue
            before, after = None, None
            if hasattr(method, '_sa_instrument_before'):
                op, argument = method._sa_instrument_before
                assert op in ('fire_append_event', 'fire_remove_event')
                before = op, argument
            if hasattr(method, '_sa_instrument_after'):
                op = method._sa_instrument_after
                assert op in ('fire_append_event', 'fire_remove_event')
                after = op
            if before:
                methods[name] = before + (after, )
            elif after:
                methods[name] = None, None, after
    return roles, methods 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def bulk_replace(values, existing_adapter, new_adapter, initiator=None):
    """Load a new collection, firing events based on prior like membership.

    Appends instances in ``values`` onto the ``new_adapter``. Events will be
    fired for any instance not present in the ``existing_adapter``.  Any
    instances in ``existing_adapter`` not present in ``values`` will have
    remove events fired upon them.

    :param values: An iterable of collection member instances

    :param existing_adapter: A :class:`.CollectionAdapter` of
     instances to be replaced

    :param new_adapter: An empty :class:`.CollectionAdapter`
     to load with ``values``


    """

    assert isinstance(values, list)

    idset = util.IdentitySet
    existing_idset = idset(existing_adapter or ())
    constants = existing_idset.intersection(values or ())
    additions = idset(values or ()).difference(constants)
    removals = existing_idset.difference(constants)

    appender = new_adapter.bulk_appender()

    for member in values or ():
        if member in additions:
            appender(member, _sa_initiator=initiator)
        elif member in constants:
            appender(member, _sa_initiator=False)

    if existing_adapter:
        for member in removals:
            existing_adapter.fire_remove_event(member, initiator=initiator) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def bulk_replace(values, existing_adapter, new_adapter):
    """Load a new collection, firing events based on prior like membership.

    Appends instances in ``values`` onto the ``new_adapter``. Events will be
    fired for any instance not present in the ``existing_adapter``.  Any
    instances in ``existing_adapter`` not present in ``values`` will have
    remove events fired upon them.

    :param values: An iterable of collection member instances

    :param existing_adapter: A :class:`.CollectionAdapter` of
     instances to be replaced

    :param new_adapter: An empty :class:`.CollectionAdapter`
     to load with ``values``


    """

    assert isinstance(values, list)

    idset = util.IdentitySet
    existing_idset = idset(existing_adapter or ())
    constants = existing_idset.intersection(values or ())
    additions = idset(values or ()).difference(constants)
    removals = existing_idset.difference(constants)

    appender = new_adapter.bulk_appender()

    for member in values or ():
        if member in additions:
            appender(member)
        elif member in constants:
            appender(member, _sa_initiator=False)

    if existing_adapter:
        remover = existing_adapter.bulk_remover()
        for member in removals:
            remover(member) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def converter(fn):
        """Tag the method as the collection converter.

        This optional method will be called when a collection is being
        replaced entirely, as in::

            myobj.acollection = [newvalue1, newvalue2]

        The converter method will receive the object being assigned and should
        return an iterable of values suitable for use by the ``appender``
        method.  A converter must not assign values or mutate the collection,
        its sole job is to adapt the value the user provides into an iterable
        of values for the ORM's use.

        The default converter implementation will use duck-typing to do the
        conversion.  A dict-like collection will be convert into an iterable
        of dictionary values, and other types will simply be iterated::

            @collection.converter
            def convert(self, other): ...

        If the duck-typing of the object does not match the type of this
        collection, a TypeError is raised.

        Supply an implementation of this method if you want to expand the
        range of possible types that can be assigned in bulk or perform
        validation on the values about to be assigned.

        """
        fn._sa_instrument_role = "converter"
        return fn 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def append_multiple_without_event(self, items):
        """Add or restore an entity to the collection, firing no events."""
        if self.empty:
            self._refuse_empty()
        appender = self._data()._sa_appender
        for item in items:
            appender(item, _sa_initiator=False) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def _locate_roles_and_methods(cls):
    """search for _sa_instrument_role-decorated methods in
    method resolution order, assign to roles.

    """

    roles = {}
    methods = {}

    for supercls in cls.__mro__:
        for name, method in vars(supercls).items():
            if not callable(method):
                continue

            # note role declarations
            if hasattr(method, "_sa_instrument_role"):
                role = method._sa_instrument_role
                assert role in (
                    "appender",
                    "remover",
                    "iterator",
                    "converter",
                )
                roles.setdefault(role, name)

            # transfer instrumentation requests from decorated function
            # to the combined queue
            before, after = None, None
            if hasattr(method, "_sa_instrument_before"):
                op, argument = method._sa_instrument_before
                assert op in ("fire_append_event", "fire_remove_event")
                before = op, argument
            if hasattr(method, "_sa_instrument_after"):
                op = method._sa_instrument_after
                assert op in ("fire_append_event", "fire_remove_event")
                after = op
            if before:
                methods[name] = before + (after,)
            elif after:
                methods[name] = None, None, after
    return roles, methods 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def test_object_duck(self):
        class MyCollection(object):
            def __init__(self):
                self.data = set()

            @collection.appender
            def push(self, item):
                self.data.add(item)

            @collection.remover
            def zark(self, item):
                self.data.remove(item)

            @collection.removes_return()
            def maybe_zark(self, item):
                if item in self.data:
                    self.data.remove(item)
                    return item

            @collection.iterator
            def __iter__(self):
                return iter(self.data)

            __hash__ = object.__hash__

            def __eq__(self, other):
                return self.data == other

        self._test_adapter(MyCollection)
        self._test_object(MyCollection)
        self.assert_(
            getattr(MyCollection, "_sa_instrumented") == id(MyCollection)
        ) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import appender [as 别名]
def converter(fn):
        """Tag the method as the collection converter.

        This optional method will be called when a collection is being
        replaced entirely, as in::

            myobj.acollection = [newvalue1, newvalue2]

        The converter method will receive the object being assigned and should
        return an iterable of values suitable for use by the ``appender``
        method.  A converter must not assign values or mutate the collection,
        it's sole job is to adapt the value the user provides into an iterable
        of values for the ORM's use.

        The default converter implementation will use duck-typing to do the
        conversion.  A dict-like collection will be convert into an iterable
        of dictionary values, and other types will simply be iterated::

            @collection.converter
            def convert(self, other): ...

        If the duck-typing of the object does not match the type of this
        collection, a TypeError is raised.

        Supply an implementation of this method if you want to expand the
        range of possible types that can be assigned in bulk or perform
        validation on the values about to be assigned.

        """
        fn._sa_instrument_role = 'converter'
        return fn