# they are expunged and set to transient state. Their attributes will not be
# changed.
# For persistent instances result by query(), they are still persistent
# but expired, which means that qualify their attributes will reload them by
# emitting a query.
# All objects not expunged are fully expired.
################################################################################
session.rollback()
################################################################################
# expire
# expire erase instances' attributes, and when those attributes are next
# accessed, a query is emitted. Only persistent instances has expired state.
################################################################################
session.expire(user)
session.expire_all()
################################################################################
# manage relationship
# emit a query and load relationship objects during the first qualification
# if no eager load is applied.
################################################################################
# load ########################################################
# may emit a quer
addresses = user.addresses
# eager load through left join
session.query(User).options('addresses')
def refresh_object(session: Session, obj: Model) -> None:
session.expire(obj)
session.refresh(obj)
# they are expunged and set to transient state. Their attributes will not be
# changed.
# For persistent instances result by query(), they are still persistent
# but expired, which means that qualify their attributes will reload them by
# emitting a query.
# All objects not expunged are fully expired.
################################################################################
session.rollback()
################################################################################
# expire
# expire erase instances' attributes, and when those attributes are next
# accessed, a query is emitted. Only persistent instances has expired state.
################################################################################
session.expire(user)
session.expire_all()
################################################################################
# manage relationship
# emit a query and load relationship objects during the first qualification
# if no eager load is applied.
################################################################################
# load ########################################################
# may emit a quer
addresses = user.addresses
# eager load through left join
session.query(User).options('addresses')
