Files
LEDMatrix/web_interface/blueprints
Chuck 550ab42f9a fix: Use JSON encoding for bracket-notation arrays and add sentinel for clearing
Fix bracket-notation array handling to prevent data loss:

1. Use JSON encoding instead of comma-join (lines 3358-3359):
   - Comma-join breaks if option values contain commas
   - Switch to json.dumps() to encode array values as JSON strings
   - _parse_form_value_with_schema() already handles JSON arrays correctly
   - Preserves values with commas, special characters, etc.

2. Add sentinel hidden input for clearing arrays:
   - Add hidden input with name="field[]" value="" in checkbox-group template
   - Ensures field is always submitted, even when all checkboxes unchecked
   - Backend filters out sentinel empty strings to detect empty array
   - Allows users to clear array to [] by unchecking all options

3. Update backend to handle sentinel:
   - Filter out sentinel empty strings from bracket notation values
   - Empty array (all unchecked) is represented as "[]" JSON string
   - Properly handles both sentinel-only (empty array) and sentinel+values cases

This fixes data loss when:
- Option values contain commas (comma-join corruption)
- All checkboxes are unchecked (field omitted from form, can't clear to [])
2026-01-11 13:40:33 -05:00
..
2025-12-27 14:15:49 -05:00