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[PR #30651] fix: fix assign value stand as default #32910

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opened 2026-02-21 20:52:18 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:52:18 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/30651

State: closed
Merged: Yes

Important

  1. Make sure you have read our contribution guidelines
  2. Ensure there is an associated issue and you have been assigned to it
  3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

fix #30650

  1. Workflow starts executing
    ↓
  2. ResponseStreamCoordinator initializes
    - Register Answer node template: "{{#conversation.conv_var#}}"
    - Parse template into segments: [TextSegment, VariableSegment]
    ↓
  3. Attempt to send streaming output (try_flush)
    - Iterate through template segments
    - Encounter VariableSegment: conversation.conv_var
    - Read current value from variable_pool → "default" (not yet updated at this point)
    - Send NodeRunStreamChunkEvent("default")
    ↓
  4. Event flow
    - NodeRunStreamChunkEvent → QueueTextChunkEvent
    - Frontend receives TextChunkStreamResponse → message event
    ↓
  5. Workflow continues execution
    - Variable Assigner node executes, updates conversation.conv_var = "123"
    - Answer node finishes execution, outputs "123"
    ↓
  6. Problem
    - Frontend has already displayed "default"
    - Need to send message_replace event to update

Screenshots

Before After
... ...

before

https://github.com/user-attachments/assets/c6284028-1b47-43ff-bf26-58afbbc25875

after

https://github.com/user-attachments/assets/b0e20223-6674-4338-8187-cf820765e59c

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 make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods
**Original Pull Request:** https://github.com/langgenius/dify/pull/30651 **State:** closed **Merged:** Yes --- > [!IMPORTANT] > > 1. Make sure you have read our [contribution guidelines](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) > 1. Ensure there is an associated issue and you have been assigned to it > 1. Use the correct syntax to link this PR: `Fixes #<issue number>`. ## Summary fix #30650 1. Workflow starts executing ↓ 2. ResponseStreamCoordinator initializes - Register Answer node template: "{{#conversation.conv_var#}}" - Parse template into segments: [TextSegment, VariableSegment] ↓ 3. Attempt to send streaming output (try_flush) - Iterate through template segments - Encounter VariableSegment: conversation.conv_var - Read current value from variable_pool → "default" (not yet updated at this point) - Send NodeRunStreamChunkEvent("default") ↓ 4. Event flow - NodeRunStreamChunkEvent → QueueTextChunkEvent - Frontend receives TextChunkStreamResponse → message event ↓ 5. Workflow continues execution - Variable Assigner node executes, updates conversation.conv_var = "123" - Answer node finishes execution, outputs "123" ↓ 6. Problem - Frontend has already displayed "default" - Need to send message_replace event to update ## Screenshots | Before | After | |--------|-------| | ... | ... | before https://github.com/user-attachments/assets/c6284028-1b47-43ff-bf26-58afbbc25875 after https://github.com/user-attachments/assets/b0e20223-6674-4338-8187-cf820765e59c ## 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 `make lint` and `make type-check` (backend) and `cd web && npx lint-staged` (frontend) to appease the lint gods
yindo added the pull-request label 2026-02-21 20:52:18 -05:00
yindo closed this issue 2026-02-21 20:52:18 -05:00
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Reference: langgenius/dify#32910
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