Question

我遇到了一个非常奇怪的错误，很难再现：AttributeError: 'list' object has no attribute '_sa_adapter'。它似乎来自一对多的关系，但一切看起来都很好，我不能简单地重现这个错误。如果我单独运行测试套件，则没有错误，只有在整个测试运行时才会发生。也许它来自没有正确清理的东西......

这是完整的堆栈：

Traceback (most recent call last):
  File "/Users/ca/[REDACTED].py", line 79, in setUp
    self.client.save()
  File "/Users/ca/[REDACTED].py", line 370, in save
    Session.add(self)
  File "/Users/ca/.pythonbrew/venvs/Python-2.7.3/api/lib/python2.7/site-packages/SQLAlchemy-0.7.5-py2.7-macosx-10.7-x86_64.egg/sqlalchemy/orm/scoping.py", line 113, in do
    return getattr(self.registry(), name)(*args, **kwargs)
  File "/Users/ca/.pythonbrew/venvs/Python-2.7.3/api/lib/python2.7/site-packages/SQLAlchemy-0.7.5-py2.7-macosx-10.7-x86_64.egg/sqlalchemy/orm/session.py", line 1223, in add
    self._save_or_update_state(state)
  File "/Users/ca/.pythonbrew/venvs/Python-2.7.3/api/lib/python2.7/site-packages/SQLAlchemy-0.7.5-py2.7-macosx-10.7-x86_64.egg/sqlalchemy/orm/session.py", line 1238, in _save_or_update_state
    halt_on=self._contains_state):
  File "/Users/ca/.pythonbrew/venvs/Python-2.7.3/api/lib/python2.7/site-packages/SQLAlchemy-0.7.5-py2.7-macosx-10.7-x86_64.egg/sqlalchemy/orm/mapper.py", line 1814, in cascade_iterator
    parent_dict, visited_states, halt_on))
  File "/Users/ca/.pythonbrew/venvs/Python-2.7.3/api/lib/python2.7/site-packages/SQLAlchemy-0.7.5-py2.7-macosx-10.7-x86_64.egg/sqlalchemy/orm/properties.py", line 817, in cascade_iterator
    get_all_pending(state, dict_)
  File "/Users/ca/.pythonbrew/venvs/Python-2.7.3/api/lib/python2.7/site-packages/SQLAlchemy-0.7.5-py2.7-macosx-10.7-x86_64.egg/sqlalchemy/orm/attributes.py", line 775, in get_all_pending
    current = getattr(current, '_sa_adapter')
AttributeError: 'list' object has no attribute '_sa_adapter'

你知道它可能来自哪里吗？

谢谢，

CHX

Answer 1

这意味着您正在不恰当地操纵检测对象 - 例如说myobject.__dict__[somekey] = [1, 2, 3]。映射对象不支持直接__dict__操作。

Answer 2

旧线程，但对于稍后查看的任何人，您希望确保您的值通过 setattr ，以便SA的映射有机会拦截。所以你可以这样做：

obj.attr = myval

或

setattr(obj, 'attr', myval)

Answer 3

我的情况是另一个会话仍然在其他线程（调度程序一个）中打开。所以，我有一个线程在激活作业后关闭会话，http服务器线程像魅力一样工作。

SQLAlchemy：对象没有属性'_sa_adapter'

3 个答案: