Freezed Kullanarak Flutter'da JSON Nasıl Ayrıştırılır? 💫 🌌 ✨

dependencies:
  flutter:
    sdk: flutter
  freezed_annotation: ^1.1.0
  json_annotation: ^4.4.0

dev_dependencies:
  build_runner: ^2.1.7
  freezed: ^1.1.1
  json_serializable: ^6.1.4

{
  "name": "Pizza da Mario",
  "cuisine": "Italian",
  "year_opened": 1990,
  "reviews": [
    {
      "score": 4.5,
      "review": "The pizza was amazing!"
    },
    {
      "score": 5.0,
      "review": "Very friendly staff, excellent service!"
    }
  ]
}

class Restaurant {
  Restaurant({
    required this.name,
    required this.cuisine,
    this.yearOpened,
    required this.reviews,
  });
  final String name;
  final String cuisine;
  final int? yearOpened;
  final List<Review> reviews;

  factory Restaurant.fromMap(Map<String, dynamic> data) {
    final name = data['name'] as String;
    final cuisine = data['cuisine'] as String;
    final yearOpened = data['year_opened'] as int?;
    final reviewsData = data['reviews'] as List<dynamic>?;
    final reviews = reviewsData != null
        ? reviewsData.map((reviewData) => Review.fromMap(reviewData)).toList()
        : <Review>[];
    return Restaurant(
      name: name,
      cuisine: cuisine,
      yearOpened: yearOpened,
      reviews: reviews,
    );
  }

  Map<String, dynamic> toMap() {
    return {
      'name': name,
      'cuisine': cuisine,
      if (yearOpened != null) 'year_opened': yearOpened,
      'reviews': reviews.map((review) => review.toMap()).toList(),
    };
  }
}

class Review {
  Review({required this.score, this.review});
  final double score;
  // nullable - assuming the review may be missing
  final String? review;

  factory Review.fromMap(Map<String, dynamic> data) {
    final score = data['score'] as double;
    final review = data['review'] as String?;
    return Review(score: score, review: review);
  }

  Map<String, dynamic> toMap() {
    return {
      'score': score,
      if (review != null) 'review': review,
    };
  }
}

// review.dart
// 1. import freezed_annotation
import 'package:freezed_annotation/freezed_annotation.dart';

// 2. 'part' dosyalarını ekle
part 'review.freezed.dart';
part 'review.g.dart';

// 3. @freezed annotation ekle
@freezed
// 4. mixin ile bir sınıf tanımlayın
class Review with _$Review {
  // 5. bir factory constructor tanımlayın
  factory Review({
    // 6. tüm argümanları/özellikleri listele
    required double score,
    String? review,
  }) = _Review;

  // 7. json'dan ayrıştırılacak başka bir factory constructor tanımlayın
  factory Review.fromJson(Map<String, dynamic> json) => _$ReviewFromJson(json);
}

// restaurant.dart
import 'package:freezed_annotation/freezed_annotation.dart';
// bağımlı olduğumuz diğer modelleri içe aktarın
import 'review.dart';

part 'restaurant.freezed.dart';
part 'restaurant.g.dart';

@freezed
class Restaurant with _$Restaurant {
  factory Restaurant({
    required String name,
    required String cuisine,

    @JsonKey(name: 'year_opened') int? yearOpened,
    // not: varsayılan değer olarak boş bir liste kullanmak
    @Default([]) List<Review> reviews,
  }) = _Restaurant;

  factory Restaurant.fromJson(Map<String, dynamic> json) =>
      _$RestaurantFromJson(json);
}

Target of URI doesn't exist: 'restaurant.freezed.dart'.
Try creating the file referenced by the URI, or Try using a URI for a file that does exist.

The name '_Restaurant' isn't a type and can't be used in a redirected constructor.
Try redirecting to a different constructor.

The method '_$RestaurantFromJson' isn't defined for the type 'Restaurant'.
Try correcting the name to the name of an existing method, or defining a method named '_$RestaurantFromJson'.

flutter pub run build_runner build --delete-conflicting-outputs

[INFO] Generating build script...
[INFO] Generating build script completed, took 419ms

[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed, took 55ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed, took 428ms

[INFO] Running build...
[INFO] 1.3s elapsed, 0/2 actions completed.
[INFO] Running build completed, took 2.1s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 27ms

[INFO] Succeeded after 2.1s with 5 outputs (5 actions)

restaurant.dart
restaurant.freezed.dart
restaurant.g.dart
review.dart
review.freezed.dart
review.g.dart

@freezed
class Review with _$Review {
  factory Review({
    // update any properties as needed
    required double score,
    String? review,
  }) = _Review;

  factory Review.fromJson(Map<String, dynamic> json) => _$ReviewFromJson(json);
}

@freezed
class Restaurant with _$Restaurant {
  factory Restaurant({
    // update any properties as needed
    required String name,
    required String cuisine,
    @JsonKey(name: 'year_opened') int? yearOpened,
    @Default([]) List<Review> reviews,
  }) = _Restaurant;

  factory Restaurant.fromJson(Map<String, dynamic> json) =>
      _$RestaurantFromJson(json);
}

flutter pub run build_runner build --delete-conflicting-outputs

@freezed
class TMDBMovieBasic with _$TMDBMovieBasic {
  factory TMDBMovieBasic({
    @JsonKey(name: 'vote_count') int? voteCount,
    required int id,
    @Default(false) bool video,
    @JsonKey(name: 'vote_average') double? voteAverage,
    required String title,
    double? popularity,
    @JsonKey(name: 'poster_path') required String posterPath,
    @JsonKey(name: 'original_language') String? originalLanguage,
    @JsonKey(name: 'original_title') String? originalTitle,
    @JsonKey(name: 'genre_ids') List<int>? genreIds,
    @JsonKey(name: 'backdrop_path') String? backdropPath,
    bool? adult,
    String? overview,
    @JsonKey(name: 'release_date') String? releaseDate,
  }) = _TMDBMovieBasic;

  factory TMDBMovieBasic.fromJson(Map<String, dynamic> json) =>
      _$TMDBMovieBasicFromJson(json);
}