feat: support batch wallet balance changes

apps/server/src/wallets/wallets.service.ts

@@ -6,7 +6,7 @@ import { Student } from '../entities/student.entity';
 import { StudentWallet } from '../entities/student-wallet.entity';
 import { WalletTransaction } from '../entities/wallet-transaction.entity';
 import { In } from 'typeorm';
-import { ChangeWalletBalanceDto } from './dto/wallet.dto';
+import { BatchChangeWalletBalanceDto, ChangeWalletBalanceDto } from './dto/wallet.dto';
 
 const money = (value: number | string | null | undefined) => Number(Number(value || 0).toFixed(2));
 
@@ -92,6 +92,20 @@ export class WalletsService {
     });
   }
 
+  async batchChangeBalance(dto: BatchChangeWalletBalanceDto, recordedBy?: number) {
+    const uniqueStudentIds = Array.from(new Set(dto.studentIds));
+    const results: Awaited<ReturnType<WalletsService['changeBalance']>>[] = [];
+    for (const studentId of uniqueStudentIds) {
+      results.push(await this.changeBalance({
+        studentId,
+        amount: dto.amount,
+        type: dto.type,
+        description: dto.description,
+      }, recordedBy));
+    }
+    return { count: uniqueStudentIds.length, results };
+  }
+
   async debitBill(manager: EntityManager, bill: Bill, recordedBy?: number) {
     if (bill.status === 'cancelled') return bill;