修改课程列表还显示已删除班级的BUG

app/services/syllabuses_service.rb

@@ -14,6 +14,10 @@ class SyllabusesService
     courses.each do |c|
       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