refactor: remove departmentId from Class entity

apps/server/src/classes/classes.service.ts

@@ -1,7 +1,7 @@
 import { Injectable, NotFoundException, BadRequestException } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository, In, Like } from 'typeorm';
-import { Class, ClassStudent, ClassTeacher, ClassSchedule, AttendanceRecord, Department, Classroom, Student, StudentDingMapping } from '../entities';
+import { Class, ClassStudent, ClassTeacher, ClassSchedule, AttendanceRecord, Classroom, Student, StudentDingMapping } from '../entities';
 import { CreateClassDto, UpdateClassDto, QueryClassDto, AddTeacherDto, QueryClassScheduleDto, QueryClassAttendanceSummaryDto, BatchImportStudentsDto } from './dto/class.dto';
 
 interface RawStudentCount {
@@ -22,8 +22,6 @@ export class ClassesService {
     private scheduleRepo: Repository<ClassSchedule>,
     @InjectRepository(AttendanceRecord)
     private attendanceRepo: Repository<AttendanceRecord>,
-    @InjectRepository(Department)
-    private deptRepo: Repository<Department>,
     @InjectRepository(Student)
     private studentRepo: Repository<Student>,
     @InjectRepository(StudentDingMapping)
@@ -32,7 +30,6 @@ export class ClassesService {
 
   async findAll(query: QueryClassDto) {
     let where: Record<string, unknown> = {};
-    if (query.departmentId) where.departmentId = query.departmentId;
     if (query.status) where.status = query.status;
     if (query.classType) where.classType = query.classType;
     if (query.keyword) where.name = Like(`%${query.keyword}%`);
@@ -99,21 +96,6 @@ export class ClassesService {
   async create(dto: CreateClassDto) {
     const { studentIds, teachers, dingUserIds, ...classData } = dto;
 
-    // Resolve departmentId: frontend may pass DingTalk dept ID, map to local
-    if (classData.departmentId) {
-      const localDept = await this.deptRepo.findOne({
-        where: { source: 'dingtalk', sourceId: String(classData.departmentId) },
-      });
-      if (localDept) {
-        classData.departmentId = localDept.id;
-      } else {
-        // Verify it's a valid local department ID
-        const exists = await this.deptRepo.findOne({ where: { id: classData.departmentId } });
-        if (!exists) {
-          throw new BadRequestException(`部门 ID ${classData.departmentId} 不存在`);
-        }
-      }
-    }
 
     const cls = this.classRepo.create(classData);
     const saved = await this.classRepo.save(cls);
@@ -165,7 +147,7 @@ export class ClassesService {
         this.studentRepo.create({
           name: `dd_${dingUserId}`,
           status: 'active',
-          departmentId: classEntity.departmentId ?? undefined,
+          departmentId: undefined,
         })
       );
       const savedStudents = await this.studentRepo.save(newStudents);
@@ -240,32 +222,6 @@ export class ClassesService {
     return { success: true };
   }
 
-  async createFromDepartment(dto: { departmentId: number; name?: string; classType?: string }) {
-    const dept = await this.deptRepo.findOne({
-      where: { id: dto.departmentId, source: 'dingtalk' },
-    });
-
-    if (!dept) {
-      throw new BadRequestException('所选部门不存在或非钉钉同步部门');
-    }
-
-    const className = dto.name || dept.name;
-    const code = `DT_${dto.departmentId}`;
-
-    const existing = await this.classRepo.findOne({ where: { code } });
-    if (existing) {
-      throw new BadRequestException(`班级"${className}"已存在（编码: ${code}）`);
-    }
-
-    const cls = this.classRepo.create({
-      name: className,
-      code,
-      departmentId: dto.departmentId,
-      classType: dto.classType || 'culture',
-      status: 'enrolling',
-    });
-    return this.classRepo.save(cls);
-  }
 
   async getStudents(classId: number) {
     return this.classStudentRepo.find({