Error saving workflow settings

[djav1985]

Self Checks

• This is only for bug report, if you would like to ask a question, please head to Discussions.
• I have searched for existing issues search for existing issues, including closed ones.
• I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
• [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:）
• Please do not modify this template :) and fill in all the required fields.

Dify version

1.0.0

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

When saving settings under monitoring:

return _get_value_for_key(keys[0], obj, default)
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/app/api/.venv/lib/python3.12/site-packages/flask_restful/fields.py", line 57, in get_value_for_key
return getattr(obj, key, default)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/api/.venv/lib/python3.12/site-packages/sqlalchemy/orm/attributes.py", line 566, in get
return self.impl.get(state, dict) # type: ignore[no-any-return]
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/api/.venv/lib/python3.12/site-packages/sqlalchemy/orm/attributes.py", line 1086, in get
value = self._fire_loader_callables(state, key, passive)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/api/.venv/lib/python3.12/site-packages/sqlalchemy/orm/attributes.py", line 1116, in _fire_loader_callables
return state._load_expired(state, passive)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/api/.venv/lib/python3.12/site-packages/sqlalchemy/orm/state.py", line 803, in _load_expired
self.manager.expired_attribute_loader(self, toload, passive)
File "/app/api/.venv/lib/python3.12/site-packages/sqlalchemy/orm/loading.py", line 1603, in load_scalar_attributes
raise orm_exc.DetachedInstanceError(
sqlalchemy.orm.exc.DetachedInstanceError: Instance <Site at 0x7fe41fe95dc0> is not bound to a Session; attribute refresh operation cannot proceed (Background on this error at: https://sqlalche.me/e/20/bhk3)

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

[dosubot]

A similar issue was reported in the Dify repository, where a DetachedInstanceError occurred during workflow response generation. This issue was closed after a fix was implemented to handle document fetching from a URL in the Anthropic LLM model, which solved a base64 decoding error ^[1].

For your specific issue with the DetachedInstanceError when saving workflow settings in a self-hosted Dify version 1.0.0 using Docker, a common resolution is to ensure that the SQLAlchemy session management is correctly handled. One approach is to set expire_on_commit to False in your SQLAlchemy session configuration. This prevents instances from being expired after a commit, which can help avoid the DetachedInstanceError ^[2].

Additionally, if you are experiencing this issue in an ARM Docker environment, a temporary workaround is to remove the knowledge base, which has been reported to resolve similar errors ^[3]. However, it's advisable to verify if this workaround is suitable for your specific setup.

To continue talking to Dosu, mention @dosu.

---

^{Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Bug Report | Other}