我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用sqlalchemy.orm.composite()。
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])
def _memoized_attr_info(self): """Info dictionary associated with the object, allowing user-defined data to be associated with this :class:`.InspectionAttr`. The dictionary is generated when first accessed. Alternatively, it can be specified as a constructor argument to the :func:`.column_property`, :func:`.relationship`, or :func:`.composite` functions. .. versionadded:: 0.8 Added support for .info to all :class:`.MapperProperty` subclasses. .. versionchanged:: 1.0.0 :attr:`.MapperProperty.info` is also available on extension types via the :attr:`.InspectionAttrInfo.info` attribute, so that it can apply to a wider variety of ORM and extension constructs. .. seealso:: :attr:`.QueryableAttribute.info` :attr:`.SchemaItem.info` """ return {}
def info(self): """Info dictionary associated with the object, allowing user-defined data to be associated with this :class:`.MapperProperty`. The dictionary is generated when first accessed. Alternatively, it can be specified as a constructor argument to the :func:`.column_property`, :func:`.relationship`, or :func:`.composite` functions. .. versionadded:: 0.8 Added support for .info to all :class:`.MapperProperty` subclasses. .. seealso:: :attr:`.QueryableAttribute.info` :attr:`.SchemaItem.info` """ return {}
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)))
