课堂不能同时存在老师和助教身份

app/controllers/courses_controller.rb

@@ -426,7 +426,7 @@ class CoursesController < ApplicationController
           active_student_exist = CourseMember.where(user_id: user[:user_id], role: 4, course_id: @course.id, is_active: 1).any?
           is_active = active_student_exist ? 0 : 1
           user_id = User.find(user[:user_id]).id
-          existing_teacher = CourseMember.find_by(course_id: @course.id, user_id: user_id, role: role)
+          existing_teacher = CourseMember.find_by(course_id: @course.id, user_id: user_id, role: %i[CREATOR PROFESSOR ASSISTANT_PROFESSOR])
           if existing_teacher.blank?
             teacher_ids << user_id
             member = CourseMember.create(course_id: @course.id, graduation_group_id: @graduation_group_id, user_id: user_id, role: role, is_active: is_active)