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[PR #18458] fix(promptMessage): correct field_serializer implementation for content serialization #28918

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opened 2026-02-21 20:44:22 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:44:22 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/18458

State: closed
Merged: Yes

Summary

Added a field_serializer for the "content" attribute in UserPromptMessage to properly handle different content types:

  • Return content as-is for None or string values
  • Process list-type content by converting model objects to dictionaries
  • Return other content types unchanged

This fixes serialization issues when UserPromptMessage contains complex content structures, especially when lists include model objects that need to be properly serialized for JSON conversion.

Fixes #18355

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Checklist

Important

Please review the checklist below before submitting your pull request.

  • 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/18458 **State:** closed **Merged:** Yes --- # Summary Added a field_serializer for the "content" attribute in UserPromptMessage to properly handle different content types: - Return content as-is for None or string values - Process list-type content by converting model objects to dictionaries - Return other content types unchanged This fixes serialization issues when UserPromptMessage contains complex content structures, especially when lists include model objects that need to be properly serialized for JSON conversion. Fixes #18355 # Screenshots | Before | After | |--------|-------| | ... | ... | # Checklist > [!IMPORTANT] > Please review the checklist below before submitting your pull request. - [ ] 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 20:44:22 -05:00
yindo closed this issue 2026-02-21 20:44:22 -05:00
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Reference: langgenius/dify#28918
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