czlonkowski
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a66cb18cce
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fix: Add helpful error messages for 'changes' vs 'updates' parameter (Issue #392)
Fixed cryptic "Cannot read properties of undefined (reading 'name')" error when
users mistakenly use 'changes' instead of 'updates' in updateNode operations.
Changes:
- Added early validation in validateUpdateNode() to detect common parameter mistake
- Provides clear, educational error messages with examples
- Fixed outdated documentation example in VS_CODE_PROJECT_SETUP.md
- Added comprehensive test coverage (2 test cases)
Error Messages:
- Before: "Diff engine error: Cannot read properties of undefined (reading 'name')"
- After: "Invalid parameter 'changes'. The updateNode operation requires 'updates'
(not 'changes'). Example: {type: "updateNode", nodeId: "abc", updates: {...}}"
Testing:
- Test coverage: 85% confidence (production ready)
- n8n-mcp-tester: All 3 test cases passed
- Code review: Approved with minor optional suggestions
Impact:
- AI agents now receive actionable error messages
- Self-correction enabled through clear examples
- Zero breaking changes (backward compatible)
- Follows existing patterns from Issue #249
Files Modified:
- src/services/workflow-diff-engine.ts (10 lines added)
- docs/VS_CODE_PROJECT_SETUP.md (1 line fixed)
- tests/unit/services/workflow-diff-engine.test.ts (2 tests added)
- CHANGELOG.md (comprehensive entry)
- package.json (version bump to 2.22.12)
Fixes #392
Conceived by Romuald Członkowski - www.aiadvisors.pl/en
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2025-11-08 13:29:22 +01:00 |
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