Refactoring my transaction factory service

factory.ts

@Injectable()
export class TransactionFactoryServices {
  constructor(public readonly dbUtils: DatabaseUtilsService) {}

  private mapProperty(source: any, target: any, propertyName: string): void {
    if (source[propertyName]) {
      target[propertyName] = source[propertyName];
    }
  }

  private mapNestedProperties(source: any, target: any, prefix?: string): void {
    Object.keys(source).forEach((key) => {
      const newKey = prefix ? `${prefix}.${key}` : key;
      if (typeof source[key] === 'object' && source[key] !== null) {
        if (!target[newKey]) {
          target[newKey] = {};
        }
        this.mapNestedProperties(source[key], target[newKey], newKey);
      } else {
        this.mapProperty(source, target, newKey);
      }
    });
  }

  clean(data: Partial<TransactionEntity>) {
    const saved: Partial<TransactionEntity> = {};

    // Map top-level properties
    ['user', 'userId', 'amount', 'signedAmount', 'reference', 'description', 'appDescription', 'category', 'balanceBefore', 'balanceAfter'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    // Map wallet properties
    ['wallet', 'rewardsWallet', 'oneTimeRewardsWallet', 'generalReference'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    // Map biller information
    ['biller', 'billerLogo', 'meter', 'tariffDescription'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    // Map recipient information
    ['recipient', 'phone', 'recipientBankCode', 'recipientAccountNumber', 'recipientAccountName', 'recipientBankName', 'recipientBankLogo'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    // Map transaction details
    ['transRemark', 'narration', 'dotAiReference', 'dotAiRequestId', 'fee'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    // Map virtual account and currency
    ['virtualAccount', 'currency'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    // Map funded by admin and referral campaign
    ['fundedByAdminId', 'oneTimeReferralCampaignId'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    // Map internal description
    ['internalDescription'].forEach((prop) => {
      this.mapProperty(data, saved, prop);
    });

    return saved;
  }

  cleanQuery(data: IGetAllTransactions) {
    const key = {} as Partial<IGetAllTransactions>;

    // ... rest of the method remains unchanged
  }
}