申请加入课程，允许身份覆盖

app/controllers/users_controller.rb

@@ -243,7 +243,7 @@ class UsersController < ApplicationController
   #status 1 同意 2 拒绝
   def dealwith_apply_request
     @msg = CourseMessage.find(params[:msg_id])
-
+    #CourseMessage content存的是role  7教辅  9 教师
     case params[:agree]
       when 'Y'
         apply_user = User.find(@msg.course_message_id)

app/services/courses_service.rb

@@ -301,26 +301,46 @@ class CoursesService
   #@state == 5 您还未登录
   #@state == 6 申请成功，请等待审核完毕
   #@state == 7 您已经发送过申请了，请耐心等待
+  #@state == 8 您已经是该课程的教师了
+  #@state == 9 您已经是该课程的教辅了
   #@state 其他 未知错误，请稍后再试
   def join_course params,current_user
     course = Course.find_by_id params[:object_id]
+
     @state = 10
     if course
       if course_endTime_timeout? course
         @state = 2
       else
         if current_user.member_of_course?(course) #如果已经是成员
+          member = course.members.where("user_id=#{current_user.id} and course_id=#{course.id}")[0]
+          roleName = member.roles[0].name if member
           if params[:course_password] == course.password
-            #如果加入角色为学生
-            if params[:role] == "10"
+            #如果加入角色为学生 并且当前是学生
+            if params[:role] == "10" && roleName == "Student"
               @state = 3
-            elsif current_user.allowed_to?(:as_teacher,course)
-              @state = 3
-            else
-              Mailer.run.join_course_request(course, User.current, params[:role])
-              #如果加入角色为教师或者教辅
-              CourseMessage.create(:user_id => course.tea_id, :course_id => course.id, :viewed => false,:content=> params[:role],:course_message_id=>User.current.id,:course_message_type=>'JoinCourseRequest',:status=>0)
-              @state = 6
+            #如果加入的角色为老师，并且当前已经是老师
+            elsif params[:role] == "9" && roleName == "Teacher"
+              @state = 8
+            #如果加入的角色教辅并且当前为教辅
+            elsif params[:role] == "7" && roleName == "TeachingAsistant"
+              @state = 9
+            #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
+                @state = 7
+              else
+                Mailer.run.join_course_request(course, User.current, params[:role])
+                CourseMessage.create(:user_id => course.tea_id, :course_id => course.id, :viewed => false,:content=> params[:role],:course_message_id=>User.current.id,:course_message_type=>'JoinCourseRequest',:status=>0)
+                @state = 6
+              end
+            #如果加入角色是学生，但是是当前课程的教师或者教辅
+            elsif params[:role] == "10" && roleName != "Student"
+              member.role_ids = [params[:role]]
+              member.save
+              StudentsForCourse.create(:student_id => current_user.id, :course_id => params[:object_id])
+              @state = 0
             end
           else
             @state = 1

app/views/courses/join.js.erb

@@ -24,6 +24,14 @@ hidden_join_course_form();
 <% elsif @state == 7%>
   alert("您已经发送过申请了，请耐心等待");
 hidden_join_course_form();
+<% elsif @state == 8%>
+alert("您已经是该课程的教师了");
+hidden_join_course_form();
+window.location.href= "http://"+"<%= Setting.host_name%>"+"/courses/" + "<%= @course.id%>"
+<% elsif @state == 9%>
+alert("您已经是该课程的教辅了");
+hidden_join_course_form();
+window.location.href= "http://"+"<%= Setting.host_name%>"+"/courses/" + "<%= @course.id%>"
 <% else %>
 alert("未知错误，请稍后再试");
 <% end %>