yaml2podo
The yaml2podo
is a generator and utility (all in one) that generates PODO classes to convert between JSON and Dart objects
Version 0.1.25
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: 0.1.25
// https://pub.dev/packages/yaml2podo
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, (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,
};
}
}
String _fromDateTime(data) {
if (data == null) {
return null;
}
if (data is DateTime) {
return data.toIso8601String();
}
return data as String;
}
List _fromList(data, Function(dynamic) toJson) {
if (data == null) {
return null;
}
var result = [];
for (var element in data) {
var value;
if (element != null) {
value = toJson(element);
}
result.add(value);
}
return result;
}
DateTime _toDateTime(data) {
if (data == null) {
return null;
}
if (data is String) {
return DateTime.parse(data);
}
return data as DateTime;
}
double _toDouble(data) {
if (data == null) {
return null;
}
if (data is int) {
return data.toDouble();
}
return data as double;
}
T _toObject<T>(data, T Function(Map) fromJson) {
if (data == null) {
return null;
}
return fromJson(data as Map);
}
List<T> _toObjectList<T>(data, T Function(Map) fromJson) {
if (data == null) {
return null;
}
var result = <T>[];
for (var element in data) {
T value;
if (element != null) {
value = fromJson(element as Map);
}
result.add(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.
import 'json_objects.yaml2podo.dart';
void main() {
var products = _getProducts();
var 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);
}
List<OrderItem> _creataOrderItems(List<Product> products) {
var result = <OrderItem>[];
for (var i = 0; i < products.length; i++) {
var product = products[i];
var orderItem =
OrderItem(price: 10.0 + i, product: product, quantity: i + 1);
result.add(orderItem);
}
return result;
}
double _calculateAmount(List<OrderItem> items) {
var result = 0.0;
for (var item in items) {
result += item.quantity * item.price;
}
return result;
}
List<Product> _getProducts() {
var result = <Product>[];
for (var i = 0; i < 2; i++) {
var 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}]}
yaml2podo
?
How to install utility Run the following command in the terminal
pub global activate yaml2podo