feat(teacher): 退出上课放弃课时记录; 课时列表按创建/更新时间倒序

Made-with: Cursor

reading-platform-frontend/src/api/teacher.ts

@@ -272,6 +272,11 @@ export function cancelLesson(id: number | string): Promise<any> {
   return http.post(`/v1/teacher/lessons/${id}/cancel`) as any;
 }
 
+/** 退出上课：删除未完成的授课记录（非已完成） */
+export function abandonLesson(id: number | string): Promise<any> {
+  return http.post(`/v1/teacher/lessons/${id}/abandon`, {}) as any;
+}
+
 // 保存学生评价记录（lessonId 使用 string 避免 Long 精度丢失）
 export function saveStudentRecord(
   lessonId: number | string,

reading-platform-frontend/src/views/teacher/lessons/LessonView.vue

@@ -922,11 +922,23 @@ const resetTimer = () => {
 const exitLesson = () => {
   Modal.confirm({
     title: '确认退出',
-    content: '确定要退出上课吗？课堂记录将不会保存。',
+    content: '确定要退出上课吗？当前未完成的授课记录将被删除，且无法恢复。',
     okText: '确认退出',
     cancelText: '继续上课',
-    onOk: () => {
+    onOk: async () => {
+      if (!lessonId.value) {
         router.back();
+        return;
+      }
+      try {
+        await teacherApi.abandonLesson(lessonId.value);
+        pauseTimer();
+        message.success('已退出上课');
+        router.back();
+      } catch (error: any) {
+        message.error(error?.message || error?.response?.data?.message || '退出失败');
+        throw error;
+      }
     },
   });
 };

reading-platform-java/src/main/java/com/reading/platform/controller/teacher/TeacherLessonController.java

@@ -154,6 +154,16 @@ public class TeacherLessonController {
         return Result.success();
     }
 
+    @Operation(summary = "退出上课（删除未完成的课时记录）")
+    @Log(module = LogModule.LESSON, type = LogOperationType.DELETE, description = "教师退出上课并删除课时")
+    @PostMapping("/{id}/abandon")
+    public Result<Void> abandonLesson(@PathVariable Long id) {
+        Long teacherId = SecurityUtils.getCurrentUserId();
+        Long tenantId = SecurityUtils.getCurrentTenantId();
+        lessonService.abandonLessonByTeacher(id, teacherId, tenantId);
+        return Result.success();
+    }
+
     @Operation(summary = "获取今日课程")
     @GetMapping("/today")
     public Result<List<LessonResponse>> getTodayLessons() {

reading-platform-java/src/main/java/com/reading/platform/service/LessonService.java

@@ -36,6 +36,11 @@ public interface LessonService extends com.baomidou.mybatisplus.extension.servic
 
     void cancelLesson(Long id);
 
+    /**
+     * 教师退出上课：删除未完成的课时记录（非「已完成」），并回退课程包使用次数（与取消逻辑一致，已取消状态不再重复扣减）
+     */
+    void abandonLessonByTeacher(Long lessonId, Long teacherId, Long tenantId);
+
     List<Lesson> getTodayLessons(Long tenantId);
 
     /**

reading-platform-java/src/main/java/com/reading/platform/service/impl/LessonServiceImpl.java

@@ -167,7 +167,7 @@ public class LessonServiceImpl extends ServiceImpl<LessonMapper, Lesson>
         if (endDate != null) {
             wrapper.le(Lesson::getLessonDate, endDate);
         }
-        wrapper.orderByAsc(Lesson::getLessonDate, Lesson::getStartTime);
+        wrapper.orderByDesc(Lesson::getCreatedAt, Lesson::getUpdatedAt);
 
         return lessonMapper.selectPage(page, wrapper);
     }
@@ -221,6 +221,33 @@ public class LessonServiceImpl extends ServiceImpl<LessonMapper, Lesson>
         }
     }
 
+    @Override
+    @Transactional
+    public void abandonLessonByTeacher(Long lessonId, Long teacherId, Long tenantId) {
+        Lesson lesson = getLessonById(lessonId);
+        if (!tenantId.equals(lesson.getTenantId())) {
+            throw new BusinessException(ErrorCode.FORBIDDEN, "无权操作该课时");
+        }
+        if (!teacherId.equals(lesson.getTeacherId())) {
+            throw new BusinessException(ErrorCode.FORBIDDEN, "无权操作该课时");
+        }
+        String st = lesson.getStatus();
+        if (LessonStatus.COMPLETED.getCode().equals(st)) {
+            throw new BusinessException(ErrorCode.BAD_REQUEST, "已完成的课程不可删除");
+        }
+        studentRecordMapper.delete(
+                new LambdaQueryWrapper<StudentRecord>().eq(StudentRecord::getLessonId, lessonId));
+        lessonFeedbackMapper.delete(
+                new LambdaQueryWrapper<LessonFeedback>().eq(LessonFeedback::getLessonId, lessonId));
+        // 与 cancelLesson 一致：仅当尚未处于「已取消」时回退使用次数（避免重复扣减）
+        if (lesson.getCourseId() != null && !LessonStatus.CANCELLED.getCode().equals(st)) {
+            coursePackageMapper.decrementUsageCount(lesson.getCourseId());
+            log.info("退出上课删除课时，课程包使用次数 -1: courseId={}", lesson.getCourseId());
+        }
+        lessonMapper.deleteById(lessonId);
+        log.info("教师退出上课，已删除课时记录 lessonId={}", lessonId);
+    }
+
     @Override
     public List<Lesson> getTodayLessons(Long tenantId) {
         return lessonMapper.selectList(