From 118cf21fdecd9106aaa3280c83ceb870f697fc1c Mon Sep 17 00:00:00 2001
From: daiao <358551898@qq.com>
Date: Thu, 27 Jun 2019 14:41:36 +0800
Subject: [PATCH] =?UTF-8?q?=E9=80=89=E9=A2=98=E6=B2=A1=E4=BF=9D=E5=AD=98?=
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---
 app/controllers/graduation_topics_controller.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/controllers/graduation_topics_controller.rb b/app/controllers/graduation_topics_controller.rb
index 521aaffc6..c611069a8 100644
--- a/app/controllers/graduation_topics_controller.rb
+++ b/app/controllers/graduation_topics_controller.rb
@@ -193,8 +193,8 @@ class GraduationTopicsController < ApplicationController
   def student_select_topic
     user_unaccept_topics = @course.student_graduation_topics.where(user_id: current_user.id, status: [0, 1])
     if user_unaccept_topics.size == 0
-      member_id = @course.course_members.find_by_user_id(current_user.id)
-      StudentGraduationTopic.create(course_id: @course.id, user_id: current_user.id, course_member_id: member_id,
+      member = @course.course_members.find_by_user_id(current_user.id)
+      StudentGraduationTopic.create(course_id: @course.id, user_id: current_user.id, course_member_id: member.try(:id),
                                     graduation_topic_id: @graduation_topic.id)
       @graduation_topic.update_attribute(:status, 1)
       normal_status("选题成功")