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我在 SQLAlchemy 中使用声明性基础模型，并且在提交时遇到以下问题：

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 693, in commit
  self.transaction.commit()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 332, in commit
  self._prepare_impl()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 311, in _prepare_impl
  self.session.flush()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1788, in flush
  self._flush(objects)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1870, in _flush
  flush_context.execute()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 351, in execute
  postsort_actions = self._generate_actions()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 325, in _generate_actions
  for rec in cycles
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 325, in <genexpr>
  for rec in cycles
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 542, in per_state_flush_actions
  dep.per_state_flush_actions(uow, states_for_prop, False)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/dependency.py", line 162, in per_state_flush_actions
  state, state.dict)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/attributes.py", line 699, in get_all_pending
  if original not in (NEVER_SET, PASSIVE_NO_RESULT, None) and \
File ".../workspace/file.py", line 250, in __eq__
  return self.foo == other.foo

AttributeError: 'symbol' object has no attribute 'foo'

当 foo 是我的模型的一个属性时，它是一个非 SQLAlchemy 类。原因是 python 中的“in”运算符依赖于__eq__检查列表成员资格。

问题是如何避免更改__eq__实现以适应 SQLAlchemy 的怪癖？

我显然可以解决other某种util.symbol（特别是NEVER_SET）的场景，但我认为是不完整的。

更新

这是我的__eq__方法：

def __eq__(self, other):
    return self.foo == other.foo

SQLAlchemy 符号根本没有foo属性......

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