mobile-app/lib/custom_model/Plant.dart

class Plant {
  int cropId;
  String executeDate;
  String description;
  String density;
  num quantity;
  List<SuppliesUsing> suppliesUsing;

  Plant(
      {this.cropId,
      this.executeDate,
      this.description,
      this.density,
      this.quantity,
      this.suppliesUsing});

  Plant.fromJson(Map<String, dynamic> json) {
    cropId = json['cropId'];
    executeDate = json['executeDate'];
    description = json['description'];
    density = json['density'];
    quantity = json['quantity'];
    if (json['suppliesUsing'] != null) {
      suppliesUsing = new List<SuppliesUsing>();
      json['suppliesUsing'].forEach((v) {
        suppliesUsing.add(new SuppliesUsing.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['density'] = this.density;
    data['quantity'] = this.quantity;
    if (this.suppliesUsing != null) {
      data['suppliesUsing'] =
          this.suppliesUsing.map((v) => v.toJson()).toList();
    }
    return data;
  }
}

class SuppliesUsing {
  String dosage;
  int quantity;
  int suppliesInWarehouseId;

  SuppliesUsing({this.dosage, this.quantity, this.suppliesInWarehouseId});

  SuppliesUsing.fromJson(Map<String, dynamic> json) {
    dosage = json['dosage'];
    quantity = json['quantity'];
    suppliesInWarehouseId = json['suppliesInWarehouseId'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['dosage'] = this.dosage;
    data['quantity'] = this.quantity;
    data['suppliesInWarehouseId'] = this.suppliesInWarehouseId;
    return data;
  }
}