调整

app/controllers/courses_controller.rb

@@ -911,6 +911,7 @@ class CoursesController < ApplicationController
             CourseAddStudentCreateWorksJob.perform_later(course.id, [current_user.id])
             StudentJoinCourseNotifyJob.perform_later(current_user.id, course.id)
           end
+          student_role = 1
         end
 
         # 创建教师身份
@@ -940,9 +941,9 @@ class CoursesController < ApplicationController
           teacher_role = 1
         end
 
-        if teacher_role && current_user.student_of_course?(course)
+        if teacher_role && student_role
           render json: { status: 0, message: message, course_id: course.id}
-        elsif current_user.student_of_course?(course)
+        elsif student_role
           render json: { status: 0, message: "加入成功", course_id: course.id}
         else
           normal_status(message)