data_faker.dart

import 'dart:math';

import 'package:reflectable/reflectable.dart';

import 'main.reflectable.dart';

const fieldReflector = FieldReflector();

class FieldReflector extends Reflectable {
  const FieldReflector()
      : super(
          typeAnnotationQuantifyCapability,
          invokingCapability,
          declarationsCapability,
          typeRelationsCapability,
          metadataCapability,
          staticInvokeCapability,
          instanceInvokeCapability,
          topLevelInvokeCapability,
          instanceInvokeCapability,
        );
}

@fieldReflector
class User {
  String? firstname, lastname;
  int? age;

  @override
  String toString() {
    return "firstname:$firstname,lastname:$lastname,age:$age";
  }
}

main() {
  initializeReflectable();
  var results = generate<User>(3);
  print(results);
}

fakeType(Type type) {
  if (type == int) {
    return Random().nextInt(100) + 1;
  } else if (type == String) {
    return "value${Random().nextInt(100) + 1}";
  }
}

List<T> generate<T>([int count = 1]) {
  List<T> results = [];
  var classMirror = fieldReflector.reflectType(T) as ClassMirror;
  for (var i = 0; i < count; i++) {
    var t = classMirror.newInstance("", []);
    var aInstanceMirror = fieldReflector.reflect(t);
    for (var field in classMirror.declarations.values) {
      if (field is! VariableMirror) continue;
      VariableMirror variableMirror = field;
      Type fieldType = variableMirror.type.reflectedType;
      var value = fakeType(fieldType);
      aInstanceMirror.invokeSetter(variableMirror.simpleName, value);
    }
    results.add(t as T);
  }

  return results;
}

Installer les dependances reflectable et build_runner (dev) , generer le code: pub run build_runner build et lancer le projet dart main.dart