dify - 💡(How to fix) Fix [Bug] Knowledge Base workflow: Code node Array[Object] output not selectable in Knowledge Base node's qa_structure

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Dify version

1.14.2

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

1. Create a Knowledge Base Creation Workflow (go to Knowledge Base → Settings → Workflow Integration → Create Workflow).
2. Add a Code node to the workflow.
   • Define an output variable in the node configuration:
     • Name: qa_data
     • Type: Array[Object]
   • Write the following Python code:

     def main():
         return {
             "qa_data": [
                 {"question": "What is Dify?", "answer": "Dify is an LLM application development platform."}
             ]
         }

✔️ Expected Behavior

The qa_structure field of the Knowledge Base node should be able to select and use an Array[Object] typed output variable from a preceding Code node. This would allow dynamic QA data generated by code to be directly ingested into a Knowledge Base.

❌ Actual Behavior

When trying to select a variable for the qa_structure field, the variable picker does not show any output from the Code node. The variable qa_data (defined as Array[Object]) is missing, making it impossible to pass generated QA pairs to the Knowledge Base node.

<img width="1079" height="608" alt="Image" src="https://github.com/user-attachments/assets/f21bf0b6-f397-434e-9804-b67cfb213644" />