Task 3: sync RENTAL class_schedule on rental create/update/delete

- ClassroomRentalsService.create/update now upsert a ClassSchedule row with schedule_type='RENTAL' and rental_id set.
- ClassroomRentalsService.remove deletes the synced schedule row; update to 'cancelled' also removes it.
- SchedulesService.getClassroomOccupancy explicitly returns INTERNAL and RENTAL schedules.
- Make classId/teacherId/rentalId nullable in ClassSchedule entity to support rental schedules.
- Add unit tests for rental schedule sync and mixed-type occupancy.

apps/server/src/schedules/schedules.service.spec.ts

@@ -3,7 +3,7 @@ import { getRepositoryToken } from '@nestjs/typeorm';
 import { ConflictException } from '@nestjs/common';
 import { Repository } from 'typeorm';
 import { SchedulesService } from './schedules.service';
-import { ClassSchedule } from '../entities/class-schedule.entity';
+import { ClassSchedule, ScheduleType } from '../entities/class-schedule.entity';
 import { ClassroomRental } from '../entities/classroom-rental.entity';
 import { Class } from '../entities/class.entity';
 import { CampusScope } from '../common/campus-scope';
@@ -13,6 +13,8 @@ function mockQueryBuilder<T>(results: T[] = []) {
   const qb = {
     where: jest.fn().mockReturnThis(),
     andWhere: jest.fn().mockReturnThis(),
+    orderBy: jest.fn().mockReturnThis(),
+    addOrderBy: jest.fn().mockReturnThis(),
     getMany: jest.fn().mockResolvedValue(results),
   };
   return qb;
@@ -124,3 +126,57 @@ describe('SchedulesService — checkConflict', () => {
     ).resolves.toEqual([]);
   });
 });
+
+describe('SchedulesService — getClassroomOccupancy', () => {
+  let service: SchedulesService;
+  let scheduleRepo: jest.Mocked<Pick<Repository<ClassSchedule>, 'createQueryBuilder'>>;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        SchedulesService,
+        { provide: getRepositoryToken(ClassSchedule), useValue: { createQueryBuilder: jest.fn() } },
+        { provide: getRepositoryToken(Class), useValue: { find: jest.fn().mockResolvedValue([]) } },
+        { provide: getRepositoryToken(ClassroomRental), useValue: { createQueryBuilder: jest.fn() } },
+        {
+          provide: CampusScope,
+          useValue: {
+            getScopeDepartmentIds: jest.fn().mockResolvedValue(null),
+            filter: jest.fn((w: unknown) => w),
+          },
+        },
+      ],
+    }).compile();
+
+    service = module.get<SchedulesService>(SchedulesService);
+    scheduleRepo = module.get(getRepositoryToken(ClassSchedule));
+  });
+
+  it('returns both INTERNAL and RENTAL schedules', async () => {
+    const internalSchedule = {
+      id: 1,
+      scheduleType: ScheduleType.INTERNAL,
+      subject: '数学',
+    } as ClassSchedule;
+    const rentalSchedule = {
+      id: 2,
+      scheduleType: ScheduleType.RENTAL,
+      subject: 'Tenant A 租赁',
+    } as ClassSchedule;
+    const qb = mockQueryBuilder<ClassSchedule>([internalSchedule, rentalSchedule]);
+    (scheduleRepo.createQueryBuilder as jest.Mock).mockReturnValue(qb);
+
+    const result = await service.getClassroomOccupancy(1, '2026-03-15');
+
+    expect(result).toHaveLength(2);
+    expect(result.map((s) => s.scheduleType)).toContain(ScheduleType.INTERNAL);
+    expect(result.map((s) => s.scheduleType)).toContain(ScheduleType.RENTAL);
+    expect(qb.where).toHaveBeenCalledWith('cs.classroomId = :classroomId', { classroomId: 1 });
+    expect(qb.andWhere).toHaveBeenCalledWith('cs.status = :status', { status: 'active' });
+    expect(qb.andWhere).toHaveBeenCalledWith('cs.scheduleType IN (:...scheduleTypes)', {
+      scheduleTypes: [ScheduleType.INTERNAL, ScheduleType.RENTAL],
+    });
+    expect(qb.andWhere).toHaveBeenCalledWith('cs.startDate <= :date', { date: '2026-03-15' });
+    expect(qb.andWhere).toHaveBeenCalledWith('cs.endDate >= :date', { date: '2026-03-15' });
+  });
+});