class Product { final int? id; final String name; final double price; final String? image; final String category; final int stock; final String? description; String? qrCode; final String? reference; final int? pointDeVenteId; final String? marque; final String? ram; final String? memoireInterne; final String? imei; Product({ this.id, required this.name, required this.price, this.image, required this.category, this.stock = 0, this.description, this.qrCode, this.reference, this.pointDeVenteId, this.marque, this.ram, this.memoireInterne, this.imei, }); bool isStockDefined() { if (stock != null) { print("stock is defined : $stock $name"); return true; } else { return false; } } factory Product.fromMap(Map map) => Product( id: map['id'], name: map['name'], price: map['price'], image: map['image'], category: map['category'], stock: map['stock'], description: map['description'], qrCode: map['qrCode'], reference: map['reference'], pointDeVenteId: map['point_de_vente_id'], marque: map['marque'], ram: map['ram'], memoireInterne: map['memoire_interne'], imei: map['imei'], ); Map toMap() => { 'id': id, 'name': name, 'price': price, 'image': image, 'category': category, 'stock': stock, 'description': description, 'qrCode': qrCode, 'reference': reference, 'point_de_vente_id': pointDeVenteId, 'marque': marque, 'ram': ram, 'memoire_interne': memoireInterne, 'imei': imei, }; }