Product Class

import 'package:hive/hive.dart';

@HiveType(typeId: 1)
class Product {
  @HiveField(0)
  final int id;

  @HiveField(1)
  final String name;

  @HiveField(2)
  final String description;

  @HiveField(3)
  final double size;

  @HiveField(4)
  final String sizeUnit;

  @HiveField(5)
  final double price;

  @HiveField(6)
  final bool byWeight;

  @HiveField(7)
  final int quantity;

  @HiveField(8)
  final String imageStr;

  @HiveField(9)
  final int category;

  @HiveField(10)
  int _cartQuantity = 0;

  Product(this.id, this.name, this.description, this.size, this.sizeUnit,
      this.price, this.byWeight, this.quantity, this.imageStr, this.category);

  factory Product.fromJson(Map<String, dynamic> json) {
    return Product(
        json['Id'],
        json['Name'],
        json['Description'],
        json['Size'] is int ? (json['Size'] as int).toDouble() : json['Size'],
        json['Size_Unit'],
        json['Price'] is int
            ? (json['Price'] as int).toDouble()
            : json['Price'],
        json['ByWeight'] as int != 0,
        json['Quantity'],
        json['Image'],
        json['Category']);
  }

  void increaseQuantity() {
    if (_cartQuantity < quantity) {
      ++_cartQuantity;
    }
  }

  void decreaseQuantity() {
    if (_cartQuantity > 0) {
      --_cartQuantity;
    }
  }

  int getCartQuantity() => _cartQuantity;
}