.

app/services/courses_service.rb

@@ -355,7 +355,7 @@ class CoursesService
               #如果加入角色为教师或者教辅，并且当前是学生，或者是要成为教辅，当前不是教辅，或者要成为教师，当前不是教师。那么要发送请求
             elsif (params[:role] != "10" && roleName == "Student") || (params[:role] == "7" && roleName != "TeachingAsistant" ) || (params[:role] == "9" && roleName != "Teacher" )
               #如果已经发送过消息了，那么就要给个提示
-              if CourseMessage.where("course_message_type = 'JoinCourseRequest' and user_id = #{course.tea_id} and content = #{params[:role]} and course_message_id = #{User.current.id} and course_id = #{course.id} and status = 0 ").count != 0
+              if CourseMessage.where("course_message_type = 'JoinCourseRequest' and user_id = #{course.tea_id} and course_message_id = #{User.current.id} and course_id = #{course.id} and status = 0 ").count != 0
                 @state = 7
               else
                 Mailer.run.join_course_request(course, User.current, params[:role])