yaml2podo 0.1.32

The `yaml2podo` is a generator and utility (all in one) that generates PODO classes to convert between JSON and Dart objects

yaml2podo

This package is no longer supported because it was flagged by Google Dart developers as being published by an unknown person.
Publisher Unknown.
As a normal person, I believe that hardly anyone would want to use software from unknown publishers.

Version 0.1.32

The yaml2podo is a generator and utility (all in one) that generates PODO classes to convert between JSON and Dart objects

Example of use.

Declarations (simple enough and informative).

example/json_objects.yaml2podo.yaml

Order:  
  date: DateTime
  items: List<OrderItem>
  amount: double
OrderItem:
  product: Product
  quantity.qty: int
  price: double  
Product:
  name: String
  id: int

Run utility.

pub global run yaml2podo example/json_objects.yaml2podo.yaml

Generated code does not contain dependencies and does not import anything. The same source code that you would write with your hands. Or at least very close to such a code.

example/json_objects.yaml2podo.dart

// Generated by 'yaml2podo'
// Version: 0.1.31
// https://pub.dev/packages/yaml2podo
// ignore_for_file: unused_element
// @dart = 2.12

class Order {
  final double? amount;
  final DateTime? date;
  final List<OrderItem?>? items;

  Order({this.amount, this.date, this.items});

  factory Order.fromJson(Map json) {
    return Order(
      amount: _toDouble(json['amount']),
      date: _toDateTime(json['date']),
      items: _toObjectList(json['items'], (e) => OrderItem.fromJson(e)),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'amount': amount,
      'date': _fromDateTime(date),
      'items': _fromList(items, (OrderItem? e) => e?.toJson()),
    };
  }
}

class OrderItem {
  final double? price;
  final Product? product;
  final int? quantity;

  OrderItem({this.price, this.product, this.quantity});

  factory OrderItem.fromJson(Map json) {
    return OrderItem(
      price: _toDouble(json['price']),
      product: _toObject(json['product'], (e) => Product.fromJson(e)),
      quantity: json['qty'] as int?,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'price': price,
      'product': product?.toJson(),
      'qty': quantity,
    };
  }
}

class Product {
  final int? id;
  final String? name;

  Product({this.id, this.name});

  factory Product.fromJson(Map json) {
    return Product(
      id: json['id'] as int?,
      name: json['name'] as String?,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'name': name,
    };
  }
}

T _checkType<T>(value) {
  if (value is T) {
    return value;
  }
  throw StateError(
      'Value of type ${value.runtimeType} is not a subtype of \'${T}\'');
}

String? _fromDateTime(data) {
  if (data == null) {
    return null;
  }
  if (data is DateTime) {
    return data.toIso8601String();
  }
  return _checkType<String>(data);
}

String? _fromEnum<T>(T? value) {
  if (value == null) {
    return null;
  }
  final str = '\$value';
  final offset = str.indexOf('.');
  if (offset == -1) {
    throw ArgumentError('The value is not an enum: \$value');
  }
  return str.substring(offset + 1);
}

List<O?>? _fromList<I, O>(List<I?>? data, O Function(I) toJson) {
  if (data == null) {
    return null;
  }
  final result = <O?>[];
  for (final element in data) {
    O? value;
    if (element != null) {
      value = toJson(element);
    }
    result.add(value);
  }
  return result;
}

Map<K?, O?>? _fromMap<K, I, O>(Map<K?, I?>? data, O Function(I) toJson) {
  if (data == null) {
    return null;
  }
  final result = <K?, O?>{};
  for (final key in data.keys) {
    O? value;
    final element = data[key];
    if (element != null) {
      value = toJson(element);
    }
    result[key] = value;
  }
  return result;
}

DateTime? _toDateTime(data) {
  if (data == null) {
    return null;
  }
  if (data is String) {
    return DateTime.parse(data);
  }
  return _checkType<DateTime>(data);
}

double? _toDouble(data) {
  if (data == null) {
    return null;
  }
  if (data is int) {
    return data.toDouble();
  }
  return _checkType<double>(data);
}

T? _toEnum<T>(String? name, Iterable<T> values) {
  if (name == null) {
    return null;
  }
  final offset = '\$T.'.length;
  for (final value in values) {
    final key = '\$value'.substring(offset);
    if (name == key) {
      return value;
    }
  }

  throw ArgumentError(
      'The getter \'\$name\' isn\'t defined for the class \'\$T\'');
}

List<T?>? _toList<T>(data, T? Function(dynamic) fromJson) {
  if (data == null) {
    return null;
  }
  final result = <T?>[];
  final sequence = _checkType<List>(data);
  for (final element in sequence) {
    T? value;
    if (element != null) {
      value = fromJson(element);
    }
    result.add(value);
  }
  return result;
}

Map<K?, V?>? _toMap<K, V>(data, V? Function(dynamic) fromJson) {
  if (data == null) {
    return null;
  }
  final result = <K?, V?>{};
  final map = _checkType<Map<K?, dynamic>>(data);
  for (final key in map.keys) {
    V? value;
    final element = map[key];
    if (element != null) {
      value = fromJson(element);
    }
    result[key] = value;
  }
  return result;
}

T? _toObject<T>(data, T Function(Map) fromJson) {
  if (data == null) {
    return null;
  }
  final json = _checkType<Map>(data);
  return fromJson(json);
}

List<T?>? _toObjectList<T>(data, T Function(Map) fromJson) {
  if (data == null) {
    return null;
  }
  final result = <T?>[];
  final sequence = _checkType<Iterable>(data);
  for (final element in sequence) {
    T? value;
    if (element != null) {
      final json = _checkType<Map>(element);
      value = fromJson(json);
    }
    result.add(value);
  }
  return result;
}

Map<K?, V?>? _toObjectMap<K, V>(data, V Function(Map) fromJson) {
  if (data == null) {
    return null;
  }
  final result = <K?, V?>{};
  final map = _checkType<Map<K?, dynamic>>(data);
  for (final key in map.keys) {
    V? value;
    final element = map[key];
    if (element != null) {
      final json = _checkType<Map>(element);
      value = fromJson(json);
    }
    result[key] = value;
  }
  return result;
}

/*
Order:  
  date: DateTime
  items: List<OrderItem>
  amount: double
OrderItem:
  product: Product
  quantity.qty: int
  price: double  
Product:
  name: String
  id: int
*/

And, of course, an example of using code.

example/example.dart

import 'json_objects.yaml2podo.dart';

void main() {
  final products = _getProducts();
  final items = _creataOrderItems(products);
  var order = Order(
      amount: _calculateAmount(items),
      date: DateTime(2019, 05, 31),
      items: items);
  var object = order.toJson();
  print(object);
  order = Order.fromJson(object);
  object = order.toJson();
  print(object);
}

double _calculateAmount(List<OrderItem> items) {
  var result = 0.0;
  for (var item in items) {
    result += item.quantity! * item.price!;
  }

  return result;
}

List<OrderItem> _creataOrderItems(List<Product> products) {
  final result = <OrderItem>[];
  for (var i = 0; i < products.length; i++) {
    final product = products[i];
    final orderItem =
        OrderItem(price: 10.0 + i, product: product, quantity: i + 1);
    result.add(orderItem);
  }

  return result;
}

List<Product> _getProducts() {
  final result = <Product>[];
  for (var i = 0; i < 2; i++) {
    final product = Product(id: i, name: 'Product $i');
    result.add(product);
  }

  return result;
}

Result:

{amount: 32.0, date: 2019-05-31T00:00:00.000, items: [{price: 10.0, product: {id: 0, name: Product 0}, qty: 1}, {price: 11.0, product: {id: 1, name: Product 1}, qty: 2}]}
{amount: 32.0, date: 2019-05-31T00:00:00.000, items: [{price: 10.0, product: {id: 0, name: Product 0}, qty: 1}, {price: 11.0, product: {id: 1, name: Product 1}, qty: 2}]}

How to install utility yaml2podo?

Run the following command in the terminal

pub global activate yaml2podo