Python Flask Security中的重置密码功能不起作用

我正在尝试在Flask安全模块中使用默认的忘记密码功能，没有任何自定义设置。在忘记密码视图中，我输入我的电子邮件地址，单击恢复密码并成功接收重置密码电子邮件。当我单击电子邮件中的链接时，我会按预期转到重置密码视图。当我尝试输入新密码并提交时，我得到以下堆栈跟踪：

Traceback (most recent call last):
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask_security/decorators.py", line 171, in wrapper
    return f(*args, **kwargs)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask_security/views.py", line 264, in reset_password
    update_password(user, form.password.data)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask_security/recoverable.py", line 78, in update_password
    _datastore.put(user)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/flask_security/datastore.py", line 31, in put
    self.db.session.add(model)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/sqlalchemy/orm/scoping.py", line 149, in do
    return getattr(self.registry(), name)(*args, **kwargs)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1371, in add
    self._save_or_update_state(state)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1383, in _save_or_update_state
    self._save_or_update_impl(state)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1639, in _save_or_update_impl
    self._update_impl(state)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1633, in _update_impl
    self._attach(state)
  File "/opt/virtualenvs/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1721, in _attach
    state.session_id, self.hash_key))
sqlalchemy.exc.InvalidRequestError: Object '<User at 0xa362a4c>' is already attached to session '33' (this is '34')

回溯（最近一次呼叫最后一次）：
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask/app.py”，第1701行，在调用中__
返回self.wsgi_应用程序（环境，启动响应）
wsgi_应用程序中的文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask/app.py”，第1689行
响应=self.make\u响应（self.handle\u异常（e））
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask/app.py”，第1687行，在wsgi_应用程序中
response=self.full\u dispatch\u request（）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask/app.py”，第1360行，完整发送请求
rv=自身处理用户异常（e）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask/app.py”，第1358行，完整发送请求
rv=自我分派请求（）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask/app.py”，第1344行，在调度请求中
返回self.view_函数[rule.endpoint]（**req.view_参数）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask_security/decorators.py”，第171行，在包装器中
返回f（*args，**kwargs）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask\u security/views.py”，第264行，在重置密码中
更新密码（用户、表单、密码、数据）
更新密码中的文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask\u security/recoverable.py”，第78行
_datastore.put（用户）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/flask_security/datastore.py”，第31行，输入
self.db.session.add（模型）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/sqlalchemy/orm/scoping.py”，do中第149行
返回getattr（self.registry（），name）（*args，**kwargs）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/sqlalchemy/orm/session.py”，第1371行，添加
自我保存或更新状态（状态）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/sqlalchemy/orm/session.py”，第1383行，处于保存或更新状态
self.\u save\u或\u update\u impl（状态）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/sqlalchemy/orm/session.py”，第1639行，保存或更新
自我更新执行（状态）
文件“/opt/virtualenvs/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py”，第1633行，在“更新”impl中
自我连接（状态）
文件“/opt/virtualenvs/project/local/lib/python2.7/site packages/sqlalchemy/orm/session.py”，第1721行，附件
state.session\u id，self.hash\u key）
sqlalchemy.exc.InvalidRequestError:对象“”已附加到会话“33”（这是“34”）

有人能帮忙吗

我使用的是：Flask==0.9，Flask-SQLAlchemy==0.16，Flask-Security==1.5.4