apn_json2model

Command line tool for generating Dart models (json_serializable) from Json file.

inspired by json_model.

based of the json_to_model

Contents

• Features
• Installation
• What does this library do
  • Get started
  • Examples
• Usage

Features

Feature	Status
Null safety	✅
toJson/fromJson	✅
immutable classes	✅
copyWith generation	✅
clone and deepclone	✅
nested json classes	✅
enum support	✅

Installation

on pubspec.yaml

dev_dependencies:
  apn_json2model: ^2.2.0

install using pub get command or if you using dart vscode/android studio, you can use install option.

What does this library do

Command line tool to convert .json files into immutable .dart models.

Get started

The command will run through your json files and find possible type, variable name, import uri, decorator and class name, and will write it into the templates.

Create/copy .json files into ./jsons/(default) on root of your project, and run flutter pub run apn_json2model.

Examples

Input Consider this files named product.json and employee.json

product.json

{
  "id": "123",
  "caseId?": "123",
  "startDate?": "2020-08-08",
  "endDate?": "2020-10-10",
  "placementDescription?": "Description string"
}

eployee.json

{
  "id": "123",
  "displayName?": "Jan Jansen",
  "@ignore products?": "$[]product"
}

Output This will generate this product.dart and employee.dart

product.dart

import 'package:flutter/foundation.dart';

@immutable
class Product {
  
  const Product({
    required this.id,
    this.caseId,
    this.startDate,
    this.endDate,
    this.placementDescription,
  });

  final String id;
  final String? caseId;
  final String? startDate;
  final String? endDate;
  final String? placementDescription;

  factory Product.fromJson(Map<String,dynamic> json) => Product(
    id: json['id'] as String,
    caseId: json['caseId'] != null ? json['caseId'] as String : null,
    startDate: json['startDate'] != null ? json['startDate'] as String : null,
    endDate: json['endDate'] != null ? json['endDate'] as String : null,
    placementDescription: json['placementDescription'] != null ? json['placementDescription'] as String : null
  );
  
  Map<String, dynamic> toJson() => {
    'id': id,
    'caseId': caseId,
    'startDate': startDate,
    'endDate': endDate,
    'placementDescription': placementDescription
  };

  Product clone() => Product(
    id: id,
    caseId: caseId,
    startDate: startDate,
    endDate: endDate,
    placementDescription: placementDescription
  );

    
  Product copyWith({
    String? id,
    String? caseId,
    String? startDate,
    String? endDate,
    String? placementDescription
  }) => Product(
    id: id ?? this.id,
    caseId: caseId ?? this.caseId,
    startDate: startDate ?? this.startDate,
    endDate: endDate ?? this.endDate,
    placementDescription: placementDescription ?? this.placementDescription,
  );  

  @override
  bool operator ==(Object other) => identical(this, other) 
    || other is Product && id == other.id && caseId == other.caseId && startDate == other.startDate && endDate == other.endDate && placementDescription == other.placementDescription;

  @override
  int get hashCode => id.hashCode ^ caseId.hashCode ^ startDate.hashCode ^ endDate.hashCode ^ placementDescription.hashCode;
}

eployee.dart

import 'package:flutter/foundation.dart';
import 'product.dart';

@immutable
class Employee {

  const Employee({
    required this.id,
    this.displayName,
    this.products,
  });

  final String id;
  final String? displayName;
  final List<Product>? products;

  factory Employee.fromJson(Map<String,dynamic> json) => Employee(
    id: json['id'] as String,
    displayName: json['displayName'] != null ? json['displayName'] as String : null
  );

  Map<String, dynamic> toJson() => {
    'id': id,
    'displayName': displayName
  };

  Employee clone() => Employee(
    id: id,
    displayName: displayName,
    products: products?.map((e) => e.clone()).toList()
  );


  Employee copyWith({
    String? id,
    String? displayName,
    List<Product>? products
  }) => Employee(
    id: id ?? this.id,
    displayName: displayName ?? this.displayName,
    products: products ?? this.products,
  );

  @override
  bool operator ==(Object other) => identical(this, other)
    || other is Employee && id == other.id
    && displayName == other.displayName
    && products == other.products;

  @override
  int get hashCode => id.hashCode ^
    displayName.hashCode ^
    products.hashCode;
}

Input Consider this file named location.json

{
    "locationId?": 93,
    "locationTypeId?": "1234",
    "updatedAt": "@datetime",
    "name?": "Lunet 10a, Veenendaal",
    "confidential?": false,
    "locationType?": "@enum:INSIDE,OUTSIDE,CLIENT,HOME,ROOM,UNKNOWN",
    "point?": {
        "longitude": 58.1234,
        "latitude": 12.123
    }
}

Output This will generate this location.dart

import 'package:flutter/foundation.dart';

@immutable
class Location {

  const Location({
    this.locationId,
    this.locationTypeId,
    required this.updatedAt,
    this.name,
    this.confidential,
    this.locationType,
    this.point,
  });

  final int? locationId;
  final String? locationTypeId;
  final DateTime updatedAt;
  final String? name;
  final bool? confidential;
  LocationLocationTypeEnum
    get locationLocationTypeEnum => _locationLocationTypeEnumValues.map[locationType]!;
  final String? locationType;
  final Point? point;

  factory Location.fromJson(Map<String,dynamic> json) => Location(
    locationId: json['locationId'] != null ? json['locationId'] as int : null,
    locationTypeId: json['locationTypeId'] != null ? json['locationTypeId'] as String : null,
    updatedAt: DateTime.parse(json['updatedAt'] as String),
    name: json['name'] != null ? json['name'] as String : null,
    confidential: json['confidential'] != null ? json['confidential'] as bool : null,
    locationType: json['locationType'] != null ? json['locationType'] as String : null,
    point: json['point'] != null ? Point.fromJson(json['point'] as Map<String, dynamic>) : null
  );

  Map<String, dynamic> toJson() => {
    'locationId': locationId,
    'locationTypeId': locationTypeId,
    'updatedAt': updatedAt.toIso8601String(),
    'name': name,
    'confidential': confidential,
    'locationType': _locationLocationTypeEnumValues.reverse[locationType],
    'point': point?.toJson()
  };

  Location clone() => Location(
    locationId: locationId,
    locationTypeId: locationTypeId,
    updatedAt: updatedAt,
    name: name,
    confidential: confidential,
    locationType: locationType,
    point: point?.clone()
  );

  Location copyWith({
    int? locationId,
    String? locationTypeId,
    DateTime? updatedAt,
    String? name,
    bool? confidential,
    String? locationType,
    Point? point
  }) => Location(
    locationId: locationId ?? this.locationId,
    locationTypeId: locationTypeId ?? this.locationTypeId,
    updatedAt: updatedAt ?? this.updatedAt,
    name: name ?? this.name,
    confidential: confidential ?? this.confidential,
    locationType: locationType ?? this.locationType,
    point: point ?? this.point,
  );

  @override
  bool operator ==(Object other) => identical(this, other)
    || other is Location && locationId == other.locationId && locationTypeId == other.locationTypeId && updatedAt == other.updatedAt && name == other.name && confidential == other.confidential && locationType == other.locationType && point == other.point;

  @override
  int get hashCode => locationId.hashCode ^ locationTypeId.hashCode ^ updatedAt.hashCode ^ name.hashCode ^ confidential.hashCode ^ locationType.hashCode ^ point.hashCode;
}

enum LocationLocationTypeEnum { INSIDE, OUTSIDE, CLIENT, HOME, ROOM, UNKNOWN }

extension LocationLocationTypeEnumEx on LocationLocationTypeEnum{
  String? get value => _locationLocationTypeEnumValues.reverse[this];
}

final _locationLocationTypeEnumValues = _LocationLocationTypeEnumConverter({
  'INSIDE': LocationLocationTypeEnum.INSIDE,
  'OUTSIDE': LocationLocationTypeEnum.OUTSIDE,
  'CLIENT': LocationLocationTypeEnum.CLIENT,
  'HOME': LocationLocationTypeEnum.HOME,
  'ROOM': LocationLocationTypeEnum.ROOM,
  'UNKNOWN': LocationLocationTypeEnum.UNKNOWN,
});

class _LocationLocationTypeEnumConverter<String, O> {
  final Map<String, O> map;
  Map<O, String>? reverseMap;

  _LocationLocationTypeEnumConverter(this.map);

  Map<O, String> get reverse => reverseMap ??= map.map((k, v) => MapEntry(v, k));
}

@immutable
class Point {

  const Point({
    required this.longitude,
    required this.latitude,
  });

  final double longitude;
  final double latitude;

  factory Point.fromJson(Map<String,dynamic> json) => Point(
    longitude: json['longitude'] as double,
    latitude: json['latitude'] as double
  );

  Map<String, dynamic> toJson() => {
    'longitude': longitude,
    'latitude': latitude
  };

  Point clone() => Point(
    longitude: longitude,
    latitude: latitude
  );


  Point copyWith({
    double? longitude,
    double? latitude
  }) => Point(
    longitude: longitude ?? this.longitude,
    latitude: latitude ?? this.latitude,
  );

  @override
  bool operator ==(Object other) => identical(this, other)
    || other is Point && longitude == other.longitude && latitude == other.latitude;

  @override
  int get hashCode => longitude.hashCode ^ latitude.hashCode;
}

Getting started

1. Create a directory jsons(default) at root of your project
2. Put all or Create json files inside jsons directory
3. run pub run apn_json2model. or flutter packages pub run apn_json2model flutter project

Usage

this package will read .json file, and generate .dart file, asign the type of the value as variable type and key as the variable name.

Description	Expression	Input (Example)	Output(declaration)	Output(import)
declare type depends on the json value	{...:any type}	{"id": 1, "message":"hello world"},	int id; String message;
import model and asign type	{...:"$value"}	{"auth":"$user"}	User auth;	import 'user.dart'
import from path	{...:"$../pathto/value"}	{"price":"$../product/price"}	Price price;	import '../product/price.dart'
asign list of type and import (can also be recursive)	{...:"$[]value"}	{"addreses":"$[]address"}	List<Address> addreses;	import 'address.dart'
import other library(input value can be array)	{"@import":...}	{"@import":"package:otherlibrary/otherlibrary.dart"}		import 'package:otherlibrary/otherlibrary.dart'
Datetime type	{...:"@datetime"}	{"createdAt": "@datetime:2020-02-15T15:47:51.742Z"}	DateTime createdAt;
Enum type	{...:"@enum:(folowed by enum separated by ',')"}	{"@import":"@enum:admin,app_user,normal"}	enum UserTypeEnum { Admin, AppUser, Normal }
Enum type with values {...:"@enum:(folowed by enum separated by ',')"}	{"@import":"@enum:admin(0),app_user(1),normal(2)"}	enum UserTypeEnum { Admin, AppUser, Normal }