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PaiNt's questions

Martin Hope
PaiNt
Asked: 2020-03-30 09:48:36 +0000 UTC
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在解析/修改别人代码的过程中，同步脚本时同步依赖实体（Person-Child）时出现错误。显然，出现了这样一种情况，它session.add(person)试图将先前被同步器删除的 orm-Child 对象添加到数据库中：

  session.add(person)
  File "/home/web/portal/env/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1559, in add
    self._save_or_update_state(state)
  File "/home/web/portal/env/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1578, in _save_or_update_state
    self._save_or_update_impl(st_)
  File "/home/web/portal/env/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1828, in _save_or_update_impl
    self._update_impl(state)
  File "/home/web/portal/env/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1814, in _update_impl
    state_str(state)
InvalidRequestError: Instance '<Child at 0xec10afec>' has been deleted.  Use the make_transient() function to send this object back to the transient state.

  1. 标记一个对象是什么意思make_transient()——在这样的上下文中应该如何以及为什么要使用它？

  2. 在代码过程中，还使用了另一种单次请求删除对象的策略：through .delete()。问题是在此类请求中提供什么以及何时使用标志synchronize_session？

session.query(Child).filter(Child.id==child.id).delete(synchronize_session=False)

sqlalchemy