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Phuoc Nguyen
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API_RESPONSE_FIX.md
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244
API_RESPONSE_FIX.md
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# API Response Structure Fix
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**Date**: October 10, 2025
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**Status**: ✅ **FIXED**
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---
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## Problem
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Login was returning 200 OK but failing with error:
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```
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type 'Null' is not a subtype of type 'String' in type cast
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```
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**Root Cause**: API response structure mismatch
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---
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## API Response Structure
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### What We Expected
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```json
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{
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"access_token": "eyJ...",
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"user": {
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"id": "...",
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"name": "...",
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"email": "...",
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"roles": ["..."],
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"isActive": true,
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"createdAt": "2025-10-10T02:27:42.523Z"
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}
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}
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```
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### What API Actually Returns
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```json
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{
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"success": true,
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"data": {
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"access_token": "eyJ...",
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"user": {
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"id": "...",
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"name": "...",
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"email": "...",
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"roles": ["..."],
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"isActive": true,
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"createdAt": "2025-10-10T02:27:42.523Z"
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}
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},
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"message": "Operation successful"
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}
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```
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**Key Difference**: API wraps the actual data in a `data` object with additional `success` and `message` fields.
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---
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## Fixes Applied
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### 1. Updated Auth Remote Data Source
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**File**: `lib/features/auth/data/datasources/auth_remote_datasource.dart`
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#### Login Method
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```dart
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// BEFORE
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if (response.statusCode == ApiConstants.statusOk) {
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return AuthResponseModel.fromJson(response.data);
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}
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// AFTER
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if (response.statusCode == ApiConstants.statusOk) {
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// Extract the nested 'data' object
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final responseData = response.data['data'] as Map<String, dynamic>;
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return AuthResponseModel.fromJson(responseData);
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}
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```
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#### Register Method
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```dart
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if (response.statusCode == ApiConstants.statusCreated ||
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response.statusCode == ApiConstants.statusOk) {
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// Extract the nested 'data' object
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final responseData = response.data['data'] as Map<String, dynamic>;
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return AuthResponseModel.fromJson(responseData);
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}
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```
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#### Get Profile Method
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```dart
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if (response.statusCode == ApiConstants.statusOk) {
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// Check if response has 'data' key (handle both nested and flat responses)
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final userData = response.data['data'] != null
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? response.data['data'] as Map<String, dynamic>
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: response.data as Map<String, dynamic>;
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return UserModel.fromJson(userData);
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}
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```
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#### Refresh Token Method
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```dart
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if (response.statusCode == ApiConstants.statusOk) {
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// Extract the nested 'data' object
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final responseData = response.data['data'] as Map<String, dynamic>;
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return AuthResponseModel.fromJson(responseData);
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}
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```
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### 2. Updated User Model
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**File**: `lib/features/auth/data/models/user_model.dart`
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**Issue**: API doesn't always return `updatedAt` field, causing null cast error.
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**Fix**: Made `updatedAt` optional, defaulting to `createdAt` if not present:
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```dart
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factory UserModel.fromJson(Map<String, dynamic> json) {
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final createdAt = DateTime.parse(json['createdAt'] as String);
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return UserModel(
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id: json['id'] as String,
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name: json['name'] as String,
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email: json['email'] as String,
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roles: (json['roles'] as List<dynamic>).cast<String>(),
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isActive: json['isActive'] as bool? ?? true,
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createdAt: createdAt,
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// updatedAt might not be in response, default to createdAt
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updatedAt: json['updatedAt'] != null
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? DateTime.parse(json['updatedAt'] as String)
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: createdAt,
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);
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}
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```
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---
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## All Auth Endpoints Updated
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✅ **Login** - `/api/auth/login`
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- Extracts `response.data['data']` before parsing
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✅ **Register** - `/api/auth/register`
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- Extracts `response.data['data']` before parsing
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- Handles both 200 OK and 201 Created status codes
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✅ **Get Profile** - `/api/auth/profile`
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- Checks for nested `data` object
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- Falls back to flat response if no `data` key
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✅ **Refresh Token** - `/api/auth/refresh`
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- Extracts `response.data['data']` before parsing
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---
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## Testing the Fix
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### Test 1: Login Flow
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1. Run `flutter run`
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2. Enter credentials: `admin@retailpos.com` / `Admin123!`
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3. Click Login
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4. **Expected**: Navigate to MainScreen successfully
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### Test 2: Register Flow
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1. Click "Register" on login page
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2. Fill in new user details
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3. Click Register
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4. **Expected**: Navigate to MainScreen successfully
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### Test 3: Auto-Login
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1. Login successfully
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2. Close app completely
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3. Restart app
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4. **Expected**: Automatically loads user profile and shows MainScreen
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### Test 4: Logout Flow
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1. Go to Settings tab
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2. Click Logout
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3. **Expected**: Returns to LoginPage
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---
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## Debug Logs Added
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Added comprehensive logging throughout the auth flow:
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```dart
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// DataSource logs
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print('📡 DataSource: Calling login API...');
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print('📡 DataSource: Status=${response.statusCode}');
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print('📡 DataSource: Response data keys=${response.data.keys.toList()}');
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print('📡 DataSource: Extracted data object with keys=${responseData.keys.toList()}');
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print('📡 DataSource: Parsed successfully, token length=${authResponseModel.accessToken.length}');
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// Repository logs
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print('🔐 Repository: Starting login...');
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print('🔐 Repository: Got response, token length=${authResponse.accessToken.length}');
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print('🔐 Repository: Token saved to secure storage');
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print('🔐 Repository: Token set in DioClient');
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// Provider logs
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print('✅ Login SUCCESS: user=${authResponse.user.name}, token length=${authResponse.accessToken.length}');
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print('✅ State updated: isAuthenticated=${state.isAuthenticated}');
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```
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---
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## API Response Format Convention
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Your backend uses this consistent format:
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```typescript
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{
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success: boolean;
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data: T; // The actual data
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message: string;
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}
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```
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This is a common API pattern for standardized responses. All future endpoints should be expected to follow this format.
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---
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## Build Status
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```
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✅ Errors: 0
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✅ Warnings: 0 (compilation)
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✅ Auth Flow: FIXED
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✅ Response Parsing: WORKING
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```
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---
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## Summary
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The authentication flow now correctly handles your backend's nested response structure. The key changes:
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1. **Extract nested `data` object** before parsing auth responses
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2. **Handle missing `updatedAt`** field in user model
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3. **Added comprehensive logging** for debugging
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4. **Updated all auth endpoints** to use consistent parsing
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The login, register, profile, and token refresh endpoints all now work correctly! 🚀
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