# Correspondence Module Refactoring Report

**Date:** 2025-12-11
**Objective:** Fix data display issues and align Correspondence Module with user requirements (Revision-based List).

## 🛠 Fixes & Changes

### 1. Revision-Based List View
- **Issue:** The Correspondence List was displaying one row per Document, hiding revision history.
- **Fix:** Refactored `CorrespondenceService.findAll` to query `CorrespondenceRevision` as the primary entity.
- **Outcome:** The list now displays every revision (e.g., Doc-001 Rev A, Doc-001 Rev B) as separate rows. Added "Rev" column to the UI.

### 2. Correspondence Detail Page
- **Issue:** Detail page was not displaying Subject/Description correctly (showing "-") because it wasn't resolving the `currentRevision` correctly or receiving unwrapped data.
- **Fix:**
  - Updated `CorrespondenceDetail` to explicitly try finding `isCurrent` revision or fallback to index 0.
  - Updated `useCorrespondence` (via `correspondence.service.ts`) to correctly unwrap the NestJS Interceptor response `{ data: { ... } }`.
- **Outcome:** Detail page now correctly shows Subject, Description, and Status from the current revision.

### 3. Edit Functionality
- **Issue:** Clicking "Edit" led to a 404/Blank page.
- **Fix:**
  - Created `app/(dashboard)/correspondences/[id]/edit/page.tsx`.
  - Refactored `CorrespondenceForm` to accept `initialData` and supporting "Update" mode (switching between `createMutation` and `updateMutation`).
- **Outcome:** Users can now edit existing DRAFT correspondences.

## 📂 Modified Files
- `backend/src/modules/correspondence/correspondence.service.ts`
- `frontend/types/correspondence.ts`
- `frontend/components/correspondences/list.tsx`
- `frontend/components/correspondences/detail.tsx`
- `frontend/components/correspondences/form.tsx`
- `frontend/lib/services/correspondence.service.ts`
- `frontend/app/(dashboard)/correspondences/[id]/edit/page.tsx` (Created)

## ✅ Verification
- Validated List View shows revisions.
- Validated Detail View loads data.
- Validated Edit Page loads data and submits updates.