# Provider Fix Summary

## ✅ Problem Fixed

The `price_documents_provider.dart` was using the wrong Riverpod pattern.

## ❌ Before (Incorrect - NotifierProvider Pattern)

```dart
@riverpod
class PriceDocuments extends _$PriceDocuments {
  @override
  List<PriceDocument> build() {
    return _mockDocuments;
  }
}
```

**Issue**: This pattern is for stateful providers that need methods to mutate state. For simple data providers that just return a value, this is overkill and causes unnecessary complexity.

## ✅ After (Correct - Functional Provider Pattern)

```dart
@riverpod
List<PriceDocument> priceDocuments(PriceDocumentsRef ref) {
  return _mockDocuments;
}

@riverpod
List<PriceDocument> filteredPriceDocuments(
  FilteredPriceDocumentsRef ref,
  DocumentCategory category,
) {
  final allDocs = ref.watch(priceDocumentsProvider);
  return allDocs.where((doc) => doc.category == category).toList();
}
```

**Benefits**:
- ✅ Simpler and more readable
- ✅ Matches pattern used by other simple providers in the project
- ✅ No need for extending base classes
- ✅ Perfect for read-only data
- ✅ Supports family modifiers for filtered data

## 📋 When to Use Each Pattern

### Use Functional Providers (@riverpod function)
**When you have:**
- ✅ Read-only data
- ✅ Computed/derived state
- ✅ Simple transformations
- ✅ No state mutations needed

**Examples in project:**
- `gifts_provider.dart` - Returns list of gifts
- `selected_category_provider.dart` - Returns current category
- `search_query_provider.dart` - Returns search text
- **`price_documents_provider.dart`** - Returns list of documents ✅

### Use Class-Based Notifiers (@riverpod class)
**When you need:**
- ✅ Mutable state with methods
- ✅ State that changes over time
- ✅ Methods to update/modify state
- ✅ Complex state management logic

**Examples in project:**
- `cart_provider.dart` - Has `addItem()`, `removeItem()`, `updateQuantity()`
- `favorites_provider.dart` - Has `toggleFavorite()`, `addFavorite()`
- `loyalty_points_provider.dart` - Has `deductPoints()`, `addPoints()`

## 🎯 Key Takeaway

For the Price Policy feature, since we're just displaying a static list of documents with filtering, the **functional provider pattern** is the correct choice. No state mutations are needed, so we don't need the class-based notifier pattern.

## 📁 Files Changed

1. `lib/features/price_policy/presentation/providers/price_documents_provider.dart`
2. `lib/features/price_policy/presentation/providers/price_documents_provider.g.dart`

## ✅ Result

The provider now works correctly and follows the project's conventions for simple data providers!