From 8eca359538515d1af54ea9b3566cc194ea104542 Mon Sep 17 00:00:00 2001
From: daiao <358551898@qq.com>
Date: Thu, 2 Jan 2020 15:22:12 +0800
Subject: [PATCH] =?UTF-8?q?=E5=88=86=E7=8F=AD=E9=97=AE=E9=A2=98?=
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---
 app/models/course.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/models/course.rb b/app/models/course.rb
index 2f561bba7..0ac879905 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -146,7 +146,7 @@ class Course < ApplicationRecord
   def teacher_group(user_id)
     data =
       if teacher_course_groups.exists?(user_id: user_id)
-        teacher_course_groups.joins(:course_group).where(user_id: user_id)
+        teacher_course_groups.joins(:course_group).where(user_id: user_id).distinct
           .pluck('course_groups.id', 'course_groups.name')
       else
         course_groups.pluck(:id, :name)