clone_discussion.py 文件源码

def prefetch(session, discussion_id):
    from assembl.lib.sqla import class_registry
    from assembl.models import DiscussionBoundBase
    for name, cls in class_registry.items():
        if issubclass(cls, DiscussionBoundBase) and not isabstract(cls):
            mapper = class_mapper(cls)
            undefers = [undefer(attr.key) for attr in mapper.iterate_properties
                        if getattr(attr, 'deferred', False)]
            conditions = cls.get_discussion_conditions(discussion_id)
            session.query(with_polymorphic(cls, "*")).filter(
                and_(*conditions)).options(*undefers).all()