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[PR #20829] fix(api): Resolve error encountered when executing QuestionClassifieNode #29502

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opened 2026-02-21 20:45:41 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:45:41 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/20829

State: closed
Merged: Yes

Summary

The QuestionClassifierNode class extends LLMNode, meaning that, per the Liskov Substitution Principle, QuestionClassifierNodeData SHOULD be compatible in contexts where LLMNodeData is expected.

However, the absence of the structured_output_enabled attribute violates this principle, causing QuestionClassifierNode to fail during execution.

This commit implements a quick and temporary workaround. A proper resolution would involve refactoring to decouple QuestionClassifierNode from LLMNode to address the underlying design issue.

Fixes #20725.

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Checklist

  • This change requires a documentation update, included: Dify Document
  • I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
  • I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
  • I've updated the documentation accordingly.
  • I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
**Original Pull Request:** https://github.com/langgenius/dify/pull/20829 **State:** closed **Merged:** Yes --- ## Summary The `QuestionClassifierNode` class extends `LLMNode`, meaning that, per the Liskov Substitution Principle, `QuestionClassifierNodeData` **SHOULD** be compatible in contexts where `LLMNodeData` is expected. However, the absence of the `structured_output_enabled` attribute violates this principle, causing `QuestionClassifierNode` to fail during execution. This commit implements a quick and temporary workaround. A proper resolution would involve refactoring to decouple `QuestionClassifierNode` from `LLMNode` to address the underlying design issue. Fixes #20725. ## Screenshots | Before | After | |--------|-------| | ![image](https://github.com/user-attachments/assets/63a79725-bcf4-49f3-819a-961c9781ae1e) | ![image](https://github.com/user-attachments/assets/7869e45f-99f3-4a27-8558-0ca8cc10df88) | ## Checklist - [ ] This change requires a documentation update, included: [Dify Document](https://github.com/langgenius/dify-docs) - [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!) - [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. - [x] I've updated the documentation accordingly. - [x] I ran `dev/reformat`(backend) and `cd web && npx lint-staged`(frontend) to appease the lint gods
yindo added the pull-request label 2026-02-21 20:45:41 -05:00
yindo closed this issue 2026-02-21 20:45:41 -05:00
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Reference: langgenius/dify#29502
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