调整

app/controllers/courses_controller.rb

@@ -682,6 +682,7 @@ class CoursesController < ApplicationController
         tip_exception("切换失败") if course_member.STUDENT?
 
         course_student = CourseMember.find_by(user_id: current_user.id, role: %i[STUDENT], course_id: @course.id)
+        course_member.update_attributes!(is_active: 0)
         if course_student
           course_student.update_attributes!(is_active: 1)
         else
@@ -689,7 +690,6 @@ class CoursesController < ApplicationController
           CourseMember.create!(user_id: current_user.id, role: 4, course_id: @course.id)
           CourseAddStudentCreateWorksJob.perform_later(@course.id, [current_user.id])
         end
-        course_member.update_attributes!(is_active: 0)
         normal_status(0, "切换成功")
       rescue => e
         uid_logger_error("switch_to_student error: #{e.message}")