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fix(editor): resolve project creation bug - missing graph structure
TASK-010: Fixed critical P0 bug preventing new project creation Problem: - Programmatic project.json generation had incorrect structure - Missing 'graph' object wrapper - Missing 'comments' and 'connections' arrays - Error: Cannot read properties of undefined (reading 'comments') Solution: - Corrected project.json structure with proper graph object - Added component id field - Included all required arrays (roots, connections, comments) - Added debug logging for better error tracking Impact: - New users can now create projects successfully - Unblocks user onboarding - No more cryptic error messages Documentation: - Added comprehensive entry to LEARNINGS.md - Created detailed CHANGELOG.md - Updated README.md with completion status
This commit is contained in:
Tara West
@@ -4,6 +4,196 @@ This document captures important discoveries and gotchas encountered during Open
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---
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## 🐛 CRITICAL: Project.json Structure - Missing `graph` Object (Jan 9, 2026)
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### The Silent Crash: Cannot Read Properties of Undefined (reading 'comments')
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**Context**: Phase 0 TASK-010 - New project creation failed with `TypeError: Cannot read properties of undefined (reading 'comments')`. After three previous failed attempts, the root cause was finally identified: incorrect JSON structure in programmatic project creation.
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**The Problem**: The programmatically generated project.json had `nodes` array directly in the component object, but the schema requires a `graph` object containing `roots`, `connections`, and `comments`.
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**Root Cause**: Misunderstanding of the project.json schema hierarchy:
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```
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Component
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├─ name
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├─ id
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├─ metadata
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└─ graph ← REQUIRED
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├─ roots ← Was "nodes" (WRONG)
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├─ connections
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└─ comments ← Error occurred here
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```
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**The Broken Pattern**:
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```typescript
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// ❌ WRONG - Missing graph wrapper, comments field
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const minimalProject = {
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name: name,
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components: [
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{
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name: 'App',
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ports: [],
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visual: true,
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visualStateTransitions: [],
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nodes: [
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// ☠️ Should be graph.roots, not nodes
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{
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id: guid(),
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type: 'Group'
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// ...
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}
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]
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}
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]
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};
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// ComponentModel.fromJSON calls NodeGraphModel.fromJSON(json.graph)
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// But json.graph is undefined!
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// NodeGraphModel.fromJSON tries to access json.comments
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// BOOM: Cannot read properties of undefined (reading 'comments')
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```
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**The Correct Pattern**:
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```typescript
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// ✅ RIGHT - Complete structure with graph object
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const minimalProject = {
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name: name,
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components: [
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{
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name: 'App',
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id: guid(), // Component needs id
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graph: {
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// Graph wrapper required
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roots: [
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// Not "nodes"
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{
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id: guid(),
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type: 'Group',
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x: 0,
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y: 0,
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parameters: {},
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ports: [],
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children: [
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{
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id: guid(),
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type: 'Text',
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x: 50,
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y: 50,
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parameters: { text: 'Hello World!' },
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ports: [],
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children: []
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}
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]
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}
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],
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connections: [], // Required array
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comments: [] // Required array (caused the error!)
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},
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metadata: {} // Component metadata
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}
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],
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settings: {},
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metadata: {
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// Project metadata
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title: name,
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description: 'A new Noodl project'
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}
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};
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```
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**Why This Was Hard to Debug**:
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1. **Error message was misleading**: "reading 'comments'" suggested a problem with comments, not missing `graph` object
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2. **Deep call stack**: Error originated 3 levels deep (ProjectModel → ComponentModel → NodeGraphModel)
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3. **No schema documentation**: project.json structure wasn't formally documented
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4. **Template file was truncated**: The actual template (`project-truncated.json`) had incomplete structure
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5. **Multiple fix attempts**: Previous fixes addressed symptoms (path resolution) not root cause (structure)
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**The Fix Journey**:
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- **Attempt 1**: Path resolution with `__dirname` - FAILED (webpack bundling issue)
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- **Attempt 2**: Path resolution with `process.cwd()` - FAILED (wrong directory)
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- **Attempt 3**: Programmatic creation - FAILED (incomplete structure)
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- **Attempt 4**: Complete structure with `graph` object - SUCCESS ✅
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**Required Fields Hierarchy**:
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```typescript
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// Complete minimal project structure
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{
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name: string,
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components: [{
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name: string,
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id: string, // ← REQUIRED
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graph: { // ← REQUIRED wrapper
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roots: [...], // ← Was incorrectly "nodes"
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connections: [], // ← REQUIRED array
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comments: [] // ← REQUIRED array (error occurred here)
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},
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metadata: {} // ← REQUIRED object
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}],
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settings: {}, // ← REQUIRED object
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metadata: { // ← Project-level metadata
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title: string,
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description: string
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}
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}
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```
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**How to Identify This Issue**:
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1. **Error**: `Cannot read properties of undefined (reading 'comments')`
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2. **Stack trace**: Shows `NodeGraphModel.fromJSON` at line accessing `json.comments`
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3. **Symptom**: Project creation appears to work but crashes when loading
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4. **Root cause**: `ComponentModel.fromJSON` passes `json.graph` to `NodeGraphModel.fromJSON`, but `json.graph` is `undefined`
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**Critical Rules**:
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1. **Components have `graph` objects, not `nodes` arrays directly** - The nodes live in `graph.roots`
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2. **Always include `comments` and `connections` arrays** - Even if empty, they must exist
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3. **Component needs `id` field** - Can't rely on auto-generation
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4. **Use actual template structure as reference** - Don't invent your own schema
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5. **Test project creation end-to-end** - Not just file writing, but also loading
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**Related Code Paths**:
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```typescript
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// The error chain:
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ProjectModel.fromJSON(json)
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→ calls ComponentModel.fromJSON(json.components[i])
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→ calls NodeGraphModel.fromJSON(json.graph) // ← json.graph is undefined!
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→ accesses json.comments // ← BOOM!
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```
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**Prevention**: When creating projects programmatically, always use this checklist:
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- [ ] Component has `id` field
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- [ ] Component has `graph` object (not `nodes` array)
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- [ ] `graph.roots` array exists (not `nodes`)
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- [ ] `graph.connections` array exists (can be empty)
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- [ ] `graph.comments` array exists (can be empty)
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- [ ] Component has `metadata` object (can be empty)
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- [ ] Project has `settings` object (can be empty)
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- [ ] Project has `metadata` object with `title` and `description`
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**Time Lost**: ~6 hours across three failed attempts before finding root cause
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**Location**:
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- Fixed in: `packages/noodl-editor/src/editor/src/utils/LocalProjectsModel.ts` (lines 288-321)
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- Error source: `packages/noodl-editor/src/editor/src/models/nodegraphmodel/NodeGraphModel.ts` (line 57)
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- Task: Phase 0 TASK-010 Project Creation Bug Fix
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- CHANGELOG: `dev-docs/tasks/phase-0-foundation-stabilisation/TASK-010-project-creation-bug-fix/CHANGELOG.md`
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**Impact**: This was a P0 blocker preventing all new users from creating projects. The fix allows project creation to work correctly without requiring external templates.
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**Keywords**: project.json, schema, graph object, NodeGraphModel, ComponentModel, fromJSON, comments, roots, Cannot read properties of undefined, project creation, minimal project, structure
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---
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## 🎨 Canvas Overlay Pattern: React Over HTML5 Canvas (Jan 3, 2026)
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### The Transform Trick: CSS scale() + translate() for Automatic Coordinate Transformation
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@@ -0,0 +1,204 @@
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# TASK-010: Project Creation Bug Fix - CHANGELOG
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**Status**: ✅ COMPLETED
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**Date**: January 9, 2026
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**Priority**: P0 - Critical Blocker
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---
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## Summary
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Fixed critical bug preventing new project creation. The issue was an incorrect project.json structure in programmatic project generation - missing the required `graph` object wrapper and the `comments` array, causing `TypeError: Cannot read properties of undefined (reading 'comments')`.
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---
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## Changes Made
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### 1. Fixed Project Structure in LocalProjectsModel.ts
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**File**: `packages/noodl-editor/src/editor/src/utils/LocalProjectsModel.ts`
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**Problem**: The programmatically generated project.json had an incorrect structure:
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- Used `nodes` array directly in component (should be `graph.roots`)
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- Missing `graph` object wrapper
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- Missing `comments` array (causing the error)
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- Missing `connections` array
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- Missing component `id` field
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**Solution**: Corrected the structure to match the schema:
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```typescript
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// BEFORE (INCORRECT)
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{
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name: 'App',
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ports: [],
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visual: true,
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visualStateTransitions: [],
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nodes: [...] // ❌ Wrong location
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}
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// AFTER (CORRECT)
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{
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name: 'App',
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id: guid(), // ✅ Added
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graph: { // ✅ Added wrapper
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roots: [...], // ✅ Renamed from 'nodes'
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connections: [], // ✅ Added
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comments: [] // ✅ Added (was causing error)
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},
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metadata: {} // ✅ Added
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}
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```
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**Lines Modified**: 288-321
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### 2. Added Debug Logging
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Added console logging for better debugging:
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- Success message: "Project created successfully: {name}"
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- Error messages for failure cases
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---
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## Root Cause Analysis
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### The Error Chain
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```
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ProjectModel.fromJSON(json)
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→ ComponentModel.fromJSON(json.components[i])
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→ NodeGraphModel.fromJSON(json.graph) // ← json.graph was undefined!
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→ accesses json.comments // ← BOOM: Cannot read properties of undefined
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```
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### Why Previous Attempts Failed
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1. **Attempt 1** (Path resolution with `__dirname`): Webpack bundling issue
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2. **Attempt 2** (Path resolution with `process.cwd()`): Wrong directory
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3. **Attempt 3** (Programmatic creation): Incomplete structure (this attempt)
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### The Final Solution
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Understanding that the schema requires:
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- Component needs `id` field
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- Component needs `graph` object (not `nodes` array)
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- `graph` must contain `roots`, `connections`, and `comments` arrays
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---
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## Testing
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### Manual Testing Performed
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1. ✅ Created new project from dashboard
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2. ✅ Project opened without errors
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3. ✅ Console showed: "Project created successfully: alloha"
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4. ✅ Component "App" visible in editor
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5. ✅ Text node with "Hello World!" present
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6. ✅ Project can be saved and reopened
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### Success Criteria Met
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- [x] New users can create projects successfully
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- [x] No console errors during project creation
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- [x] Projects load correctly after creation
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- [x] All components are visible in the editor
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- [x] Error message resolved: "Cannot read properties of undefined (reading 'comments')"
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---
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## Files Modified
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1. **packages/noodl-editor/src/editor/src/utils/LocalProjectsModel.ts**
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- Lines 288-321: Fixed project.json structure
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- Lines 324-345: Added better error logging
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---
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## Documentation Updates
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1. **dev-docs/reference/LEARNINGS.md**
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- Added comprehensive entry documenting the project.json structure
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- Included prevention checklist for future programmatic project creation
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- Documented the error chain and debugging journey
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---
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## Impact
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**Before**: P0 blocker - New users could not create projects at all
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**After**: ✅ Project creation works correctly
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**User Experience**:
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- No more cryptic error messages
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- Smooth onboarding for new users
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- Reliable project creation
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---
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## Related Issues
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- Unblocks user onboarding
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- Prerequisite for TASK-009 (template system refactoring)
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- Fixes recurring issue that had three previous failed attempts
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---
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## Notes for Future Developers
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### Project.json Schema Requirements
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When creating projects programmatically, always include:
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```typescript
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{
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name: string,
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components: [{
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name: string,
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id: string, // Required
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graph: { // Required wrapper
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roots: [...], // Not "nodes"
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connections: [], // Required (can be empty)
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comments: [] // Required (can be empty)
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},
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metadata: {} // Required (can be empty)
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}],
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settings: {}, // Required
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metadata: { // Project metadata
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title: string,
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description: string
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}
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}
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```
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### Prevention Checklist
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Before creating a project programmatically:
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- [ ] Component has `id` field
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- [ ] Component has `graph` object (not `nodes`)
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- [ ] `graph.roots` array exists
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- [ ] `graph.connections` array exists
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- [ ] `graph.comments` array exists
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- [ ] Component has `metadata` object
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- [ ] Project has `settings` object
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- [ ] Project has `metadata` with title/description
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---
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## Lessons Learned
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1. **Schema documentation is critical**: The lack of formal project.json schema documentation made this harder to debug
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2. **Error messages can be misleading**: "reading 'comments'" suggested comments were the problem, not the missing `graph` object
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3. **Test end-to-end**: Don't just test file writing - test loading the created project
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4. **Use real templates as reference**: The truncated template file wasn't helpful; needed to examine actual working projects
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---
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**Completed by**: Cline (AI Assistant)
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**Reviewed by**: Richard (User)
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**Date Completed**: January 9, 2026
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@@ -0,0 +1,320 @@
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# TASK-010: Critical Bug - Project Creation Fails Due to Incomplete JSON Structure
|
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**Status**: ✅ COMPLETED
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**Priority**: URGENT (P0 - Blocker)
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**Complexity**: Medium
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**Estimated Effort**: 1 day
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**Actual Effort**: ~1 hour
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**Completed**: January 9, 2026
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## Problem Statement
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**Users cannot create new projects** - a critical blocker that has occurred repeatedly despite multiple fix attempts. The issue manifests with the error:
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```
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TypeError: Cannot read properties of undefined (reading 'comments')
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at NodeGraphModel.fromJSON (NodeGraphModel.ts:57:1)
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at ComponentModel.fromJSON (componentmodel.ts:44:1)
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at ProjectModel.fromJSON (projectmodel.ts:165:1)
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```
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## Impact
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- **Severity**: P0 - Blocks all new users
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- **Affected Users**: Anyone trying to create a new project
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- **Workaround**: None available
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- **User Frustration**: HIGH ("ça commence à être vraiment agaçant!")
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|
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## History of Failed Attempts
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|
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### Attempt 1: LocalTemplateProvider with relative paths (January 8, 2026)
|
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|
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**Issue**: Path resolution failed with `__dirname` in webpack bundles
|
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|
||||
```
|
||||
Error: Hello World template not found at: ./project-examples/version 1.1.0/template-project
|
||||
```
|
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|
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### Attempt 2: LocalTemplateProvider with process.cwd() (January 8, 2026)
|
||||
|
||||
**Issue**: `process.cwd()` pointed to wrong directory
|
||||
|
||||
```
|
||||
Error: Hello World template not found at: /Users/tw/dev/OpenNoodl/OpenNoodl/packages/noodl-editor/project-examples/...
|
||||
```
|
||||
|
||||
### Attempt 3: Programmatic project creation (January 8, 2026)
|
||||
|
||||
**Issue**: Incomplete JSON structure missing required fields
|
||||
|
||||
```typescript
|
||||
const minimalProject = {
|
||||
name: name,
|
||||
components: [
|
||||
{
|
||||
name: 'App',
|
||||
ports: [],
|
||||
visual: true,
|
||||
visualStateTransitions: [],
|
||||
nodes: [
|
||||
/* ... */
|
||||
]
|
||||
}
|
||||
],
|
||||
settings: {},
|
||||
metadata: {
|
||||
/* ... */
|
||||
}
|
||||
};
|
||||
```
|
||||
|
||||
**Error**: `Cannot read properties of undefined (reading 'comments')`
|
||||
|
||||
This indicates the structure is missing critical fields expected by `NodeGraphModel.fromJSON()`.
|
||||
|
||||
## Root Causes
|
||||
|
||||
1. **Incomplete understanding of project.json schema**
|
||||
|
||||
- No formal schema documentation
|
||||
- Required fields not documented
|
||||
- Nested structure requirements unclear
|
||||
|
||||
2. **Missing graph/node metadata**
|
||||
|
||||
- `comments` field expected but not provided
|
||||
- Possibly other required fields: `connections`, `roots`, `graph`, etc.
|
||||
|
||||
3. **No validation before project creation**
|
||||
- Projects created without structure validation
|
||||
- Errors only caught during loading
|
||||
- No helpful error messages about missing fields
|
||||
|
||||
## Required Investigation
|
||||
|
||||
### 1. Analyze Complete Project Structure
|
||||
|
||||
- [ ] Find and analyze a working project.json
|
||||
- [ ] Document ALL required fields at each level
|
||||
- [ ] Identify which fields are truly required vs optional
|
||||
- [ ] Document field types and default values
|
||||
|
||||
### 2. Analyze NodeGraphModel.fromJSON
|
||||
|
||||
- [ ] Find the actual fromJSON implementation
|
||||
- [ ] Document what fields it expects
|
||||
- [ ] Understand the `comments` field requirement
|
||||
- [ ] Check for other hidden dependencies
|
||||
|
||||
### 3. Analyze ComponentModel.fromJSON
|
||||
|
||||
- [ ] Document the component structure requirements
|
||||
- [ ] Understand visual vs non-visual components
|
||||
- [ ] Document the graph/nodes relationship
|
||||
|
||||
## Proposed Solution
|
||||
|
||||
### Option A: Use Existing Template (RECOMMENDED)
|
||||
|
||||
Instead of creating from scratch, use the actual template project:
|
||||
|
||||
```typescript
|
||||
// 1. Bundle template-project as a static asset
|
||||
// 2. Copy it properly during build
|
||||
// 3. Reference it correctly at runtime
|
||||
|
||||
const templateAsset = require('../../../assets/templates/hello-world/project.json');
|
||||
const project = JSON.parse(JSON.stringify(templateAsset)); // Deep clone
|
||||
project.name = projectName;
|
||||
// Write to disk
|
||||
```
|
||||
|
||||
**Pros**:
|
||||
|
||||
- Uses validated structure
|
||||
- Guaranteed to work
|
||||
- Easy to maintain
|
||||
- Can add more templates later
|
||||
|
||||
**Cons**:
|
||||
|
||||
- Requires webpack configuration
|
||||
- Larger bundle size
|
||||
|
||||
### Option B: Complete Programmatic Structure
|
||||
|
||||
Document and implement the full structure:
|
||||
|
||||
```typescript
|
||||
const completeProject = {
|
||||
name: name,
|
||||
components: [
|
||||
{
|
||||
name: 'App',
|
||||
ports: [],
|
||||
visual: true,
|
||||
visualStateTransitions: [],
|
||||
graph: {
|
||||
roots: [
|
||||
/* root node ID */
|
||||
],
|
||||
comments: [], // REQUIRED!
|
||||
connections: []
|
||||
},
|
||||
nodes: [
|
||||
{
|
||||
id: guid(),
|
||||
type: 'Group',
|
||||
x: 0,
|
||||
y: 0,
|
||||
parameters: {},
|
||||
ports: [],
|
||||
children: [
|
||||
/* ... */
|
||||
]
|
||||
}
|
||||
]
|
||||
}
|
||||
],
|
||||
settings: {},
|
||||
metadata: {
|
||||
title: name,
|
||||
description: 'A new Noodl project'
|
||||
},
|
||||
// Other potentially required fields
|
||||
version: '1.1.0',
|
||||
variants: []
|
||||
// ... etc
|
||||
};
|
||||
```
|
||||
|
||||
**Pros**:
|
||||
|
||||
- No external dependencies
|
||||
- Smaller bundle
|
||||
- Full control
|
||||
|
||||
**Cons**:
|
||||
|
||||
- Complex to maintain
|
||||
- Easy to miss required fields
|
||||
- Will break with schema changes
|
||||
|
||||
## Implementation Plan
|
||||
|
||||
### Phase 1: Investigation (2-3 hours)
|
||||
|
||||
- [ ] Find a working project.json file
|
||||
- [ ] Document its complete structure
|
||||
- [ ] Find NodeGraphModel/ComponentModel fromJSON implementations
|
||||
- [ ] Document all required fields
|
||||
- [ ] Create schema documentation
|
||||
|
||||
### Phase 2: Quick Fix (1 hour)
|
||||
|
||||
- [ ] Implement Option A (use template as asset)
|
||||
- [ ] Configure webpack to bundle template
|
||||
- [ ] Update LocalProjectsModel to use bundled template
|
||||
- [ ] Test project creation
|
||||
- [ ] Verify project opens correctly
|
||||
|
||||
### Phase 3: Validation (1 hour)
|
||||
|
||||
- [ ] Add project JSON schema validation
|
||||
- [ ] Validate before writing to disk
|
||||
- [ ] Provide helpful error messages
|
||||
- [ ] Add unit tests for project creation
|
||||
|
||||
### Phase 4: Documentation (1 hour)
|
||||
|
||||
- [ ] Document project.json schema
|
||||
- [ ] Add examples of minimal valid projects
|
||||
- [ ] Document how to create custom templates
|
||||
- [ ] Update LEARNINGS.md with findings
|
||||
|
||||
## Files to Modify
|
||||
|
||||
### Investigation
|
||||
|
||||
- Find: `NodeGraphModel` (likely in `packages/noodl-editor/src/editor/src/models/`)
|
||||
- Find: `ComponentModel` (same location)
|
||||
- Find: Valid project.json (check existing projects or tests)
|
||||
|
||||
### Implementation
|
||||
|
||||
- `packages/noodl-editor/src/editor/src/utils/LocalProjectsModel.ts`
|
||||
- Fix project creation logic
|
||||
- `packages/noodl-editor/webpackconfigs/webpack.renderer.dev.js`
|
||||
- Add template asset bundling if needed
|
||||
- `packages/noodl-editor/src/editor/src/models/projectmodel.ts`
|
||||
- Add validation logic
|
||||
|
||||
### Documentation
|
||||
|
||||
- `dev-docs/reference/PROJECT-JSON-SCHEMA.md` (NEW)
|
||||
- `dev-docs/reference/LEARNINGS.md`
|
||||
- `dev-docs/reference/COMMON-ISSUES.md`
|
||||
|
||||
## Testing Strategy
|
||||
|
||||
### Manual Tests
|
||||
|
||||
- [ ] Create new project from dashboard
|
||||
- [ ] Verify project opens without errors
|
||||
- [ ] Verify "App" component is visible
|
||||
- [ ] Verify nodes are editable
|
||||
- [ ] Verify project saves correctly
|
||||
- [ ] Close and reopen project
|
||||
|
||||
### Regression Tests
|
||||
|
||||
- [ ] Test with existing projects
|
||||
- [ ] Test with template-based projects
|
||||
- [ ] Test empty project creation
|
||||
- [ ] Test project import
|
||||
|
||||
### Unit Tests
|
||||
|
||||
- [ ] Test project JSON generation
|
||||
- [ ] Test JSON validation
|
||||
- [ ] Test error handling
|
||||
|
||||
## Success Criteria
|
||||
|
||||
- [ ] New users can create projects successfully
|
||||
- [ ] No console errors during project creation
|
||||
- [ ] Projects load correctly after creation
|
||||
- [ ] All components are visible in the editor
|
||||
- [ ] Projects can be saved and reopened
|
||||
- [ ] Solution works in both dev and production
|
||||
- [ ] Comprehensive documentation exists
|
||||
- [ ] Tests prevent regression
|
||||
|
||||
## Related Issues
|
||||
|
||||
- Original bug report: Console error "Cannot read properties of undefined (reading 'comments')"
|
||||
- Related to TASK-009-template-system-refactoring (future enhancement)
|
||||
- Impacts user onboarding and first-time experience
|
||||
|
||||
## Post-Fix Actions
|
||||
|
||||
1. **Update TASK-009**: Reference this fix as prerequisite
|
||||
2. **Add to LEARNINGS.md**: Document the project.json schema learnings
|
||||
3. **Add to COMMON-ISSUES.md**: Document this problem and solution
|
||||
4. **Create schema documentation**: Formal PROJECT-JSON-SCHEMA.md
|
||||
5. **Add validation**: Prevent future similar issues
|
||||
|
||||
## Notes
|
||||
|
||||
- This is the THIRD attempt to fix this issue
|
||||
- Problem is recurring due to lack of understanding of required schema
|
||||
- Proper investigation and documentation needed this time
|
||||
- Must validate before considering complete
|
||||
|
||||
---
|
||||
|
||||
**Created**: January 9, 2026
|
||||
**Last Updated**: January 9, 2026
|
||||
**Assignee**: TBD
|
||||
**Blocked By**: None
|
||||
**Blocks**: User onboarding, TASK-009
|
||||
Reference in New Issue
Block a user