# Phase 2 Plan 2: Pydantic Response Models and Resources Summary

**Type-safe Pydantic models for all core n8n types with WorkflowsResource demonstrating hub-and-spoke pattern**

## Accomplishments

- Created Pydantic v2 models for all core n8n API types (Workflow, Execution, Project, User) with automatic validation and type coercion
- Implemented field aliasing for camelCase API responses to snake_case Python attributes using Field(alias=...) and ConfigDict(populate_by_name=True)
- Built WorkflowsResource spoke with list() and get() methods using @retry decorator and Pydantic validation
- Integrated WorkflowsResource into APIClient hub via self.workflows property, completing the hub-and-spoke architecture
- Added pytest-httpx 0.36.0 for HTTP mocking in resource tests
- Achieved 97% test coverage with 27 new tests across models and resources
- All quality gates passing: pytest (59 tests), ruff, mypy

## Files Created/Modified

- `src/n8n_cli/client/models/__init__.py` - Public API exports for all Pydantic models
- `src/n8n_cli/client/models/workflow.py` - Workflow model with id, name, active, timestamps, tags, nodes, connections, project_id
- `src/n8n_cli/client/models/execution.py` - Execution model with workflow_id, status, timestamps, mode, data
- `src/n8n_cli/client/models/project.py` - Project model with name, type, timestamps
- `src/n8n_cli/client/models/user.py` - User model with email, optional first_name/last_name, role
- `src/n8n_cli/client/resources/__init__.py` - Public API exports for resource modules
- `src/n8n_cli/client/resources/workflows.py` - WorkflowsResource with list(active=None) and get(workflow_id) methods using retry logic and Pydantic validation
- `src/n8n_cli/client/core.py` - Added self.workflows = WorkflowsResource(self._client) to complete hub-and-spoke pattern
- `tests/test_models_workflow.py` - 6 tests for Workflow model validation, field aliasing, defaults, error handling
- `tests/test_models_other.py` - 14 tests for Execution, Project, User models (validation, aliasing, optional fields)
- `tests/test_workflows_resource.py` - 7 tests for WorkflowsResource list/get methods and APIClient integration
- `pyproject.toml` - Added pytest-httpx>=0.36.0 dev dependency
- `uv.lock` - Locked pytest-httpx 0.36.0

## Decisions Made

- Used Pydantic v2 ConfigDict(populate_by_name=True) to accept both camelCase (API) and snake_case (Python) field names
- Added type: ignore[valid-type] comments to @retry decorated methods (same pattern as core.py) due to tenacity decorator affecting type inference
- Implemented WorkflowsResource methods with same retry configuration as APIClient._request (2s/4s/8s exponential backoff, max 3 attempts)
- Chose pytest-httpx over respx for HTTP mocking (simpler API, better pytest integration)
- Made finished_at optional in Execution model (None for running executions)
- Made first_name/last_name optional in User model (not all users have names set)

## Issues Encountered

- Pre-commit hooks stashed implementation files during RED phase commits - resolved by committing tests and implementation together (acceptable given pre-commit requirements)
- Mypy flagged @retry decorated methods with "is not valid as a type" error - resolved with type: ignore[valid-type] comments
- Pydantic reports field aliases in ValidationError messages (e.g., "workflowId" instead of "workflow_id") - updated test assertions to match this behavior

## Next Phase Readiness

Phase 2 (API Client & Core Types) complete. Ready for Phase 3 (Workflow Management commands).

**API Client established:**
- ✅ Hub-and-spoke architecture (APIClient hub with resource spokes)
- ✅ Custom exception hierarchy (401/404/429/400/5xx mapped)
- ✅ Connection pooling and retry logic (httpx.Client + tenacity)
- ✅ Type-safe Pydantic models (Workflow, Execution, Project, User)
- ✅ WorkflowsResource with list/get methods

**Next up:**
Phase 3 will implement workflow CLI commands (list, view, pull, push, etc.) using the API client and Pydantic models established in Phase 2.

## TDD Commit Hashes

**Task 1: Workflow Pydantic model**
- RED: 87370d5 - test(02-02): add failing tests for Workflow Pydantic model
- GREEN: 8410d0e - feat(02-02): implement Workflow Pydantic model with field aliasing

**Task 2: Execution, Project, User models**
- RED+GREEN: 3ede7cb - test(02-02): add tests for Execution, Project, User models
  (Combined due to pre-commit hook requirements)

**Task 3: WorkflowsResource**
- RED+GREEN: ef0fe92 - feat(02-02): add WorkflowsResource with list/get methods and APIClient integration
  (Combined due to pre-commit hook requirements, includes pytest-httpx dependency)
