flutter/lib/pages/my/merchant/balance/model.dart

class AccountBill {
  final int id;
  final int? memberId;
  final int? accountId;
  final double moneyBalance; // 当前余额
  final double beforeBalance; // 变动前余额
  final double afterBalance; // 变动后余额
  final double changeAmount; // 变动金额
  final int changeType; // 变动类型（1收入 2支出）
  final String changeDesc; // 变动描述
  final String source; // 变动来源
  final String sourceName; // 变动来源文案
  final String createTime; // 创建时间
  final int createBy;
  final String updateTime;

  AccountBill({
    required this.id,
    this.memberId,
    this.accountId,
    this.moneyBalance = 0.0,
    this.beforeBalance = 0.0,
    this.afterBalance = 0.0,
    this.changeAmount = 0.0,
    this.changeType = 1,
    this.changeDesc = '',
    this.source = '未知来源',
    this.sourceName = '未知来源',
    this.createTime = '',
    this.createBy = 0,
    this.updateTime = '',
  });

  factory AccountBill.fromJson(Map<String, dynamic> json) {
    return AccountBill(
      id: int.tryParse(json['id']?.toString() ?? '') ?? 0,
      memberId: json['memberId'] != null ? int.tryParse(json['memberId'].toString()) : null,
      accountId: json['accountId'] != null ? int.tryParse(json['accountId'].toString()) : null,
      moneyBalance: double.tryParse(json['moneyBalance']?.toString() ?? '0') ?? 0.0,
      beforeBalance: double.tryParse(json['beforeBalance']?.toString() ?? '0') ?? 0.0,
      afterBalance: double.tryParse(json['afterBalance']?.toString() ?? '0') ?? 0.0,
      changeAmount: double.tryParse(json['changeAmount']?.toString() ?? '0') ?? 0.0,
      changeType: int.tryParse(json['changeType']?.toString() ?? '1') ?? 1,
      changeDesc: json['changeDesc'] ?? '',
      source: json['source']?.toString() ?? '未知来源',
      sourceName: json['sourceName']?.toString() ?? '未知sourceName',
      createTime: json['createTime'] ?? '',
      createBy: int.tryParse(json['createBy']?.toString() ?? '0') ?? 0,
      updateTime: json['updateTime'] ?? '',
    );
  }
}