[Bug] When applying another answer, the uploaded file will be lost

[zhainanshidai]

Contact Information

No response

MaxKB Version

v1/v2

Problem Description

应用换一个答案时，上传的文件会丢失

Steps to Reproduce

The expected correct result

No response

Related log output

Additional Information

No response

[VinodHatti7019]

Hi @zhainanshidai,

Thank you for reporting this issue! The problem of uploaded files being lost when switching to another answer is a critical UX bug that needs attention. Let me help you with some troubleshooting steps and potential solutions.

Understanding the Issue

From your screenshots, it appears that when you switch between different answer options in the application, the file attachments are not persisting. This is likely a state management or session handling issue.

Potential Root Causes

1. State Management Issue: File uploads might not be stored in a persistent state
2. Session Storage Problem: Files could be stored in temporary session storage that gets cleared
3. Form Reset Logic: Answer switching might be triggering a form reset that clears file inputs
4. Cache Issue: Browser or application cache not preserving file references

Immediate Workarounds

Workaround 1: Save Before Switching

# Always save your current work before switching answers
# This ensures files are committed to the backend

Workaround 2: Re-upload After Switching

As a temporary solution, keep your files ready to re-upload after switching answers.

Workaround 3: Check Browser Console

Open browser DevTools (F12) and check the Console tab for any errors when switching answers:

// Look for errors like:
// - "File not found"
// - "Session expired"
// - "State reset"

Potential Code-Level Solutions

If you have access to the codebase, here are some areas to investigate:

1. Check State Persistence

# Ensure file state is preserved in the application state
class AnswerManager:
    def __init__(self):
        self.uploaded_files = {}  # Persist files across answer switches
    
    def switch_answer(self, new_answer_id):
        # Save current files before switching
        self.save_current_files()
        self.load_answer(new_answer_id)
        # Restore files after switching
        self.restore_files()

2. Use Persistent Storage

# Store file references in localStorage or database
import json

def save_files_to_storage(files, answer_id):
    """Save file metadata to persistent storage"""
    file_data = {
        'answer_id': answer_id,
        'files': [{'name': f.name, 'path': f.path} for f in files]
    }
    # Store in database or localStorage
    db.save('uploaded_files', file_data)

def restore_files_from_storage(answer_id):
    """Restore files when switching answers"""
    file_data = db.get('uploaded_files', answer_id)
    return file_data['files']

3. Debug File Upload Flow

# Add logging to track file lifecycle
import logging

logger = logging.getLogger(__name__)

def on_answer_switch(old_answer_id, new_answer_id):
    logger.info(f"Switching from {old_answer_id} to {new_answer_id}")
    logger.info(f"Current files: {get_current_files()}")
    # Continue with switch logic
    logger.info(f"Files after switch: {get_current_files()}")

Information Needed for Debugging

To help the maintainers fix this issue, please provide:

1. Browser and Version: Which browser are you using?
2. MaxKB Version: Exact version number (v1.x.x or v2.x.x)
3. File Types: What types of files are you uploading?
4. File Sizes: Are these large files or small files?
5. Console Errors: Any errors in browser console (F12)?
6. Network Tab: Check Network tab for failed requests

Reproduction Steps

Could you confirm if this happens:

• ✅ Every time you switch answers?
• ✅ Only with certain file types?
• ✅ Only after a specific time period?
• ✅ In both v1 and v2?

Recommended Fix for Maintainers

For @zyyfit (assigned maintainer):

The fix likely involves:

1. Implementing proper state management for file uploads
2. Storing file references in a persistent store (Redis/Database)
3. Adding file restoration logic on answer switch
4. Adding unit tests for file persistence across answer switches

Would you like me to help create a PR to fix this issue? I can work on implementing proper file state management.

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Solution by VinodHatti7019 (Done By AI)— powered with #IknowAI. Join the IknowAI community for more AI/Python/automation solutions.

[Shenguobin0102]

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[shaohuzhang1]

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