Python mutable.MutableComposite方法代码示例

# 需要导入模块: from sqlalchemy.ext import mutable [as 别名]
# 或者: from sqlalchemy.ext.mutable import MutableComposite [as 别名]
def _get_listen_keys(cls, attribute):
        """Given a descriptor attribute, return a ``set()`` of the attribute
        keys which indicate a change in the state of this attribute.

        This is normally just ``set([attribute.key])``, but can be overridden
        to provide for additional keys.  E.g. a :class:`.MutableComposite`
        augments this set with the attribute keys associated with the columns
        that comprise the composite value.

        This collection is consulted in the case of intercepting the
        :meth:`.InstanceEvents.refresh` and
        :meth:`.InstanceEvents.refresh_flush` events, which pass along a list
        of attribute names that have been refreshed; the list is compared
        against this set to determine if action needs to be taken.

        .. versionadded:: 1.0.5

        """
        return set([attribute.key]) 

# 需要导入模块: from sqlalchemy.ext import mutable [as 别名]
# 或者: from sqlalchemy.ext.mutable import MutableComposite [as 别名]
def _get_listen_keys(cls, attribute):
        """Given a descriptor attribute, return a ``set()`` of the attribute
        keys which indicate a change in the state of this attribute.

        This is normally just ``set([attribute.key])``, but can be overridden
        to provide for additional keys.  E.g. a :class:`.MutableComposite`
        augments this set with the attribute keys associated with the columns
        that comprise the composite value.

        This collection is consulted in the case of intercepting the
        :meth:`.InstanceEvents.refresh` and
        :meth:`.InstanceEvents.refresh_flush` events, which pass along a list
        of attribute names that have been refreshed; the list is compared
        against this set to determine if action needs to be taken.

        .. versionadded:: 1.0.5

        """
        return {attribute.key} 

# 需要导入模块: from sqlalchemy.ext import mutable [as 别名]
# 或者: from sqlalchemy.ext.mutable import MutableComposite [as 别名]
def coerce(cls, key, value):
        """Given a value, coerce it into the target type.

        Can be overridden by custom subclasses to coerce incoming
        data into a particular type.

        By default, raises ``ValueError``.

        This method is called in different scenarios depending on if
        the parent class is of type :class:`.Mutable` or of type
        :class:`.MutableComposite`.  In the case of the former, it is called
        for both attribute-set operations as well as during ORM loading
        operations.  For the latter, it is only called during attribute-set
        operations; the mechanics of the :func:`.composite` construct
        handle coercion during load operations.


        :param key: string name of the ORM-mapped attribute being set.
        :param value: the incoming value.
        :return: the method should return the coerced value, or raise
         ``ValueError`` if the coercion cannot be completed.

        """
        if value is None:
            return None
        msg = "Attribute '%s' does not accept objects of type %s"
        raise ValueError(msg % (key, type(value))) 

# 需要导入模块: from sqlalchemy.ext import mutable [as 别名]
# 或者: from sqlalchemy.ext.mutable import MutableComposite [as 别名]
def _setup_composite_listener():
    def _listen_for_type(mapper, class_):
        for prop in mapper.iterate_properties:
            if (hasattr(prop, 'composite_class') and
                    isinstance(prop.composite_class, type) and
                    issubclass(prop.composite_class, MutableComposite)):
                prop.composite_class._listen_on_attribute(
                    getattr(class_, prop.key), False, class_)
    if not event.contains(Mapper, "mapper_configured", _listen_for_type):
        event.listen(Mapper, 'mapper_configured', _listen_for_type) 

# 需要导入模块: from sqlalchemy.ext import mutable [as 别名]
# 或者: from sqlalchemy.ext.mutable import MutableComposite [as 别名]
def _setup_composite_listener():
    def _listen_for_type(mapper, class_):
        for prop in mapper.iterate_properties:
            if (
                hasattr(prop, "composite_class")
                and isinstance(prop.composite_class, type)
                and issubclass(prop.composite_class, MutableComposite)
            ):
                prop.composite_class._listen_on_attribute(
                    getattr(class_, prop.key), False, class_
                )

    if not event.contains(Mapper, "mapper_configured", _listen_for_type):
        event.listen(Mapper, "mapper_configured", _listen_for_type) 

# 需要导入模块: from sqlalchemy.ext import mutable [as 别名]
# 或者: from sqlalchemy.ext.mutable import MutableComposite [as 别名]
def setup_mappers(cls):
        foo = cls.tables.foo

        Point = cls._type_fixture()

        # in this case, this is not actually a MutableComposite.
        # so we don't expect it to track changes
        mapper(
            Foo,
            foo,
            properties={
                "data": composite(lambda x, y: Point(x, y), foo.c.x, foo.c.y)
            },
        ) 

# 需要导入模块: from sqlalchemy.ext import mutable [as 别名]
# 或者: from sqlalchemy.ext.mutable import MutableComposite [as 别名]
def _setup_composite_listener():
    def _listen_for_type(mapper, class_):
        for prop in mapper.iterate_properties:
            if (hasattr(prop, 'composite_class') and
                isinstance(prop.composite_class, type) and
                 issubclass(prop.composite_class, MutableComposite)):
                prop.composite_class._listen_on_attribute(
                    getattr(class_, prop.key), False, class_)
    if not event.contains(Mapper, "mapper_configured", _listen_for_type):
        event.listen(Mapper, 'mapper_configured', _listen_for_type)