跨域bug修复2

backend/services/homework_service.py

@@ -31,12 +31,10 @@ class HomeworkService:
         role = await PermissionChecker.get_user_role(user_id)
         
         if role == "班主任":
-            class_id = await PermissionChecker.get_user_class_id(user_id)
-            assignments = await HomeworkModel.get_assignments_by_class(class_id)
+            assignments = await HomeworkModel.get_all_assignments()
         elif role == "科代表":
-            class_id = await PermissionChecker.get_user_class_id(user_id)
             subject_ids = await PermissionChecker.get_user_subject_ids(user_id)
-            assignments = await HomeworkModel.get_assignments_by_subjects(class_id, subject_ids)
+            assignments = await HomeworkModel.get_assignments_by_subjects(subject_ids)
         else:
             assignments = []
         
@@ -51,10 +49,7 @@ class HomeworkService:
         created_by: int
     ) -> Dict[str, Any]:
         """创建作业"""
-        class_id = await PermissionChecker.get_user_class_id(created_by)
-        
         assignment_id = await HomeworkModel.create_assignment(
-            class_id=class_id,
             subject_id=subject_id,
             title=title,
             description=description,