json_serializable_ioc_generator

json_serializable_ioc_generator simplifies the registration of toJson and fromJson methods for models annotated with @JsonSerializable. This package works in conjunction with json_serializable_ioc to automatically generate the registration method.

Features

• Automatic Method Registration: Automatically generates code to register factory and converter methods for models.
• Leverages @JsonSerializable: Uses the json_annotation package for model serialization.
• Custom Annotation for Bootstrapping: The @RegisterJsonSerializable annotation is applied to the method responsible for app configuration (like main()), triggering the generation of the $registerJsonSerializableMethods() method.
• Generated Registration Method: Generates a $registerJsonSerializableMethods() function to register serialization methods at runtime.

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Installation

To use json_serializable_ioc_generator, add the following dependencies to your pubspec.yaml:

dependencies:
  json_annotation: ^4.7.0
  json_serializable_ioc: ^1.0.0

dev_dependencies:
  build_runner: ^2.1.0
  json_serializable_ioc_generator: ^1.0.0

Then run:

flutter pub get

How It Works

1. Model Annotation: Annotate your model classes with @JsonSerializable from the json_annotation package. This triggers the generation of toJson and fromJson methods.
2. RegisterJsonSerializable: Use the @RegisterJsonSerializable annotation to mark a method responsible for dependency configuration, such as the main method. This generates the $registerJsonSerializableMethods() function.
3. Code Generation: Use the build_runner tool to generate the registration method.
4. Bootstrap Application: Call the generated $registerJsonSerializableMethods() method to register the serialization methods in the JsonFactoryIoc and JsonConverterIoc containers.

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Basic Usage

1. Annotate Your Model

// user.dart
import 'package:json_annotation/json_annotation.dart';

part 'user.g.dart';

@JsonSerializable()
class User {
  final int id;
  final String name;
  
  User({
    required this.id,
    required this.name,
  });

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);

  Map<String, dynamic> toJson() => _$UserToJson(this);
}

In this example, the User model is annotated with @JsonSerializable from the json_annotation package. This will generate fromJson and toJson methods for this model.

2. Code Generation

Run the following command to trigger code generation:

flutter pub run build_runner build

This will generate the $registerJsonSerializableMethods() function, which automatically registers the factory and converter methods.

3. Register Serialization Methods

In your main.dart or another bootstrap method, use the @RegisterJsonSerializable annotation to mark the method for code generation. After code generation, call the generated $registerJsonSerializableMethods() function.

// main.dart
import 'dart:convert';
import 'package:json_ioc_example/user.dart';
import 'package:json_ioc_example/main.json_ioc.dart';
import 'package:json_serializable_ioc/json_serializable_ioc.dart';

@RegisterJsonSerializable()
void main(List<String> arguments) {
  // Register all annotated models' methods
  $registerJsonSerializableMethods();

  // Deserialize a User object from JSON
  User user = factory<User>({
    "id": 55,
    "name": "potatoes",
  });

  // Serialize the User object back to JSON
  print(jsonEncode(converter<User>(user))); // Output: {"id":55,"name":"potatoes"}
}

In this example:

• The @RegisterJsonSerializable annotation is used on the main() method, which generates the $registerJsonSerializableMethods() function.
• This function registers the toJson and fromJson methods in the JsonFactoryIoc and JsonConverterIoc containers.
• You can then use the factory<T>() function to dynamically deserialize a User instance from JSON and the converter<T>() function to serialize it back to JSON.

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API Reference

@RegisterJsonSerializable

This annotation is used to mark a method responsible for dependency configuration, typically the main() method. It triggers code generation for the $registerJsonSerializableMethods() function, which registers the toJson and fromJson methods of all models annotated with @JsonSerializable.

Generated Method: $registerJsonSerializableMethods()

This method is generated by the code generator and registers all toJson and fromJson methods of models annotated with @JsonSerializable into the JsonFactoryIoc and JsonConverterIoc containers. It must be called at runtime for proper registration.

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Example

// user.dart
import 'package:json_annotation/json_annotation.dart';

part 'user.g.dart';

@JsonSerializable()
class User {
  final int id;
  final String name;
  
  User({
    required this.id,
    required this.name,
  });

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);

  Map<String, dynamic> toJson() => _$UserToJson(this);
}

// main.dart
import 'dart:convert';
import 'package:json_ioc_example/user.dart';
import 'package:json_ioc_example/main.json_ioc.dart';
import 'package:json_serializable_ioc/json_serializable_ioc.dart';

@RegisterJsonSerializable()
void main(List<String> arguments) {
  // Register all annotated models' methods
  $registerJsonSerializableMethods();

  // Deserialize a User object from JSON
  User user = factory<User>({
    "id": 55,
    "name": "potatoes",
  });

  // Serialize the User object back to JSON
  print(jsonEncode(converter<User>(user))); // Output: {"id":55,"name":"potatoes"}
}

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FAQ

• Do I have to annotate every model?
  Yes, each model must be annotated with @JsonSerializable to have toJson and fromJson methods generated.

• Where do I use @RegisterJsonSerializable?
  Use this annotation on a method like main() or another initialization method that will trigger the generation of $registerJsonSerializableMethods().

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