stack/docs/KNOW-003-completion.md

KNOW-003: Tag Management API - Completion Summary

Status: ✅ Complete

Implemented Files

DTOs (Data Transfer Objects)

• apps/api/src/knowledge/dto/create-tag.dto.ts

  • Validates tag creation input
  • Required: name
  • Optional: slug, color (hex format), description
  • Slug validation: lowercase alphanumeric with hyphens

• apps/api/src/knowledge/dto/update-tag.dto.ts

  • Validates tag update input
  • All fields optional for partial updates
  • Same validation rules as create DTO

Service Layer

• apps/api/src/knowledge/tags.service.ts
  • create() - Creates tag with auto-generated slug if not provided
  • findAll() - Lists all workspace tags with entry counts
  • findOne() - Gets single tag by slug
  • update() - Updates tag, regenerates slug if name changes
  • remove() - Deletes tag (cascade removes entry associations)
  • getEntriesWithTag() - Lists all entries tagged with specific tag
  • findOrCreateTags() - Helper for entry creation/update with auto-create option

Controller Layer

• apps/api/src/knowledge/tags.controller.ts
  • All endpoints authenticated via AuthGuard
  • Workspace isolation enforced on all operations
  • Endpoints:
    • POST /api/knowledge/tags - Create tag
    • GET /api/knowledge/tags - List tags
    • GET /api/knowledge/tags/:slug - Get tag
    • PUT /api/knowledge/tags/:slug - Update tag
    • DELETE /api/knowledge/tags/:slug - Delete tag (204 No Content)
    • GET /api/knowledge/tags/:slug/entries - Get entries with tag

Module Configuration

• apps/api/src/knowledge/knowledge.module.ts

  • Imports: PrismaModule, AuthModule
  • Exports: TagsService (for use by entry service)

• Updated apps/api/src/app.module.ts

  • Added KnowledgeModule to main app imports

Tests

• apps/api/src/knowledge/tags.service.spec.ts (17 tests, all passing)

  • Tests for all CRUD operations
  • Slug generation and validation
  • Conflict detection
  • Entry associations
  • Auto-create functionality

• apps/api/src/knowledge/tags.controller.spec.ts (12 tests, all passing)

  • Tests for all endpoints
  • Authentication validation
  • Request/response handling

Key Features

1. Automatic Slug Generation

   • Converts tag names to URL-friendly slugs
   • Example: "My Tag Name!" → "my-tag-name"
   • Can be overridden with custom slug

2. Workspace Isolation

   • All operations scoped to user's workspace
   • Tags are unique per workspace (slug-based)

3. Color Validation

   • Hex color format required (#RRGGBB)
   • Optional field for UI customization

4. Entry Count

   • Tag list includes count of associated entries
   • Useful for UI display and tag management

5. Auto-Create Support

   • findOrCreateTags() method for entry service
   • Enables creating tags on-the-fly during entry creation
   • Generates friendly names from slugs

6. Conflict Handling

   • Detects duplicate slugs within workspace
   • Returns 409 Conflict with descriptive message
   • Handles race conditions during auto-create

Test Coverage

• Total Tests: 29 passing
• Service Tests: 17
• Controller Tests: 12
• Coverage Areas:
  • CRUD operations
  • Validation (slug format, color format)
  • Error handling (not found, conflicts, bad requests)
  • Workspace isolation
  • Auto-create functionality
  • Authentication checks

TypeScript Compliance

• ✅ No any types used
• ✅ Explicit return types on all public methods
• ✅ Explicit parameter types throughout
• ✅ Interfaces used for DTOs
• ✅ Proper error handling with typed exceptions
• ✅ Follows ~/.claude/agent-guides/typescript.md
• ✅ Follows ~/.claude/agent-guides/backend.md

Database Schema

Uses existing Prisma schema:

model KnowledgeTag {
  id          String    @id @default(uuid()) @db.Uuid
  workspaceId String    @map("workspace_id") @db.Uuid
  workspace   Workspace @relation(...)

  name        String
  slug        String
  color       String?
  description String?

  entries     KnowledgeEntryTag[]

  @@unique([workspaceId, slug])
  @@index([workspaceId])
}

Integration Points

1. Entry Service (parallel implementation)

   • Will use TagsService.findOrCreateTags() for tag associations
   • Entry create/update accepts tag slugs array
   • Auto-create option available

2. Authentication

   • Uses existing AuthGuard from apps/api/src/auth/guards/auth.guard.ts
   • Workspace ID extracted from request user context

3. Prisma

   • Uses existing PrismaService for database operations
   • Leverages Prisma's type-safe query builder

Next Steps (for Entry Service Integration)

1. Update entry service to accept tags: string[] in DTOs
2. Call TagsService.findOrCreateTags() during entry creation/update
3. Associate tags via KnowledgeEntryTag junction table
4. Consider adding autoCreateTags: boolean option to entry DTOs

Git Commit

feat(knowledge): add tag management API (KNOW-003)

- Add Tag DTOs (CreateTagDto, UpdateTagDto) with validation
- Implement TagsService with CRUD operations
- Add TagsController with authenticated endpoints
- Support automatic slug generation from tag names
- Add workspace isolation for tags
- Include entry count in tag responses
- Add findOrCreateTags method for entry creation/update
- Implement comprehensive test coverage (29 tests passing)

Endpoints:
- GET /api/knowledge/tags - List workspace tags
- POST /api/knowledge/tags - Create tag
- GET /api/knowledge/tags/:slug - Get tag by slug
- PUT /api/knowledge/tags/:slug - Update tag
- DELETE /api/knowledge/tags/:slug - Delete tag
- GET /api/knowledge/tags/:slug/entries - List entries with tag

Related: KNOW-003

Commit hash: f07f044

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Task Status: COMPLETE ✅ Coding Standards: Compliant ✅ Tests: Passing (29/29) ✅ Documentation: Updated ✅