修改课程列表还显示已删除班级的BUG

app/services/syllabuses_service.rb

@@ -15,6 +15,10 @@ class SyllabusesService
       other.courses << c[:course] unless c[:course].syllabus
     end
     
+    user.syllabuses.each do |syllabus|
+      syllabus.courses = syllabus.courses.not_deleted
+    end
+
     user.syllabuses.to_a << other
   end