feat: auto-populate department_id on create + seed default campus with backfill

apps/server/src/deposits/deposits.service.ts

@@ -2,6 +2,7 @@ import { Injectable, NotFoundException, BadRequestException } from '@nestjs/comm
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import { Deposit } from '../entities/deposit.entity';
+import { Student } from '../entities/student.entity';
 import { DepositInstallment } from '../entities/deposit-installment.entity';
 import { CampusScope } from '../common/campus-scope';
 import { CreateDepositDto, RefundDepositDto, CreateDepositWithInstallmentsDto } from './dto/deposit.dto';
@@ -13,6 +14,8 @@ export class DepositsService {
     @InjectRepository(Deposit) private repo: Repository<Deposit>,
     @InjectRepository(DepositInstallment)
     private installmentRepo: Repository<DepositInstallment>,
+    @InjectRepository(Student)
+    private studentRepo: Repository<Student>,
     private readonly scope: CampusScope,
   ) {}
 
@@ -36,6 +39,8 @@ export class DepositsService {
   }
 
   async create(dto: CreateDepositDto, userId?: number) {
+    const student = await this.studentRepo.findOne({ where: { id: dto.studentId } });
+    if (!student) throw new NotFoundException('学生不存在');
     const deposit = this.repo.create({
       studentId: dto.studentId,
       amount: dto.amount,
@@ -44,15 +49,18 @@ export class DepositsService {
       status: 'paid',
       recordedBy: userId,
     });
+    deposit.departmentId = student.departmentId;
 
     if (dto instanceof CreateDepositWithInstallmentsDto && dto.installments?.length) {
-      deposit.installments = dto.installments.map((i) =>
-        this.installmentRepo.create({
+      deposit.installments = dto.installments.map((i) => {
+        const inst = this.installmentRepo.create({
           amount: i.amount,
           dueDate: i.dueDate,
           status: 'pending',
-        }),
-      );
+        });
+        inst.departmentId = student.departmentId;
+        return inst;
+      });
     }
 
     return this.repo.save(deposit);