mobile-app/lib/custom_model/Environment.dart

class Environment {
  int id;
  int cropId;
  String executeDate;
  String description;
  List<EnvDetail> envDetail;

  Environment(
      {this.id,
      this.cropId,
      this.executeDate,
      this.description,
      this.envDetail});

  Environment.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    cropId = json['cropId'];
    executeDate = json['executeDate'];
    description = json['description'];
    if (json['envDetail'] != null) {
      envDetail = new List<EnvDetail>();
      json['envDetail'].forEach((v) {
        envDetail.add(new EnvDetail.fromJson(v));
      });
    }
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['id'] = this.id;
    data['cropId'] = this.cropId;
    data['executeDate'] = this.executeDate;
    data['description'] = this.description;
    if (this.envDetail != null) {
      data['envDetail'] = this.envDetail.map((v) => v.toJson()).toList();
    }
    return data;
  }
}

class EnvDetail {
  int id;
  String name;
  int index;

  EnvDetail({this.id, this.name, this.index});

  EnvDetail.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    name = json['name'];
    index = json['index'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['id'] = this.id;
    data['name'] = this.name;
    data['index'] = this.index;
    return data;
  }
}