iv_and/invoice.dart

class Invoice {
  final int? id;
  final int customerId;
  final String date;
  final double total;
  final double tax;
  final double discountTotal;

  Invoice({
    this.id,
    required this.customerId,
    required this.date,
    required this.total,
    required this.tax,
    required this.discountTotal,
  });

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'customer_id': customerId,
      'date': date,
      'total': total,
      'tax': tax,
      'discount_total': discountTotal,
    };
  }

  factory Invoice.fromMap(Map<String, dynamic> map) {
    return Invoice(
      id: map['id'] as int?,
      customerId: map['customer_id'] as int,
      date: map['date'] as String,
      total: map['total'] as double,
      tax: map['tax'] as double,
      discountTotal: map['discount_total'] as double,
    );
  }
}