mobile-app/lib/custom_model/Nursery.dart

class Nursery {
  int cropId;
  String executeDate;
  String description;
  String substrates;
  num quantity;
  num seedLength;
  num seedIncubationTime;
  List<NurseryDetail> nurseryDetail;

  Nursery(
      {this.cropId,
      this.executeDate,
      this.description,
      this.substrates,
      this.quantity,
      this.seedLength,
      this.seedIncubationTime,
      this.nurseryDetail});

  Nursery.fromJson(Map<String, dynamic> json) {
    cropId = json['cropId'];
    executeDate = json['executeDate'];
    description = json['description'];
    substrates = json['substrates'];
    quantity = json['quantity'];
    seedLength = json['seedLength'];
    seedIncubationTime = json['seedIncubationTime'];
    if (json['nurseryDetail'] != null) {
      nurseryDetail = new List<NurseryDetail>();
      json['nurseryDetail'].forEach((v) {
        nurseryDetail.add(new NurseryDetail.fromJson(v));
      });
    }
  }

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

class NurseryDetail {
  int id;
  String workerName;
  String trayNumber;
  bool isExpanded = false;
  NurseryDetail({this.workerName, this.trayNumber});

  NurseryDetail.clone(NurseryDetail nurseryDetail) {
    this.id = nurseryDetail.id;
    this.workerName = nurseryDetail.workerName;
    this.trayNumber = nurseryDetail.trayNumber;
    this.isExpanded = nurseryDetail.isExpanded;
  }

  NurseryDetail.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    workerName = json['workerName'];
    trayNumber = json['trayNumber'];
  }

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