diff --git a/db/migrate/20200214022547_add_index_to_user_id_and_shixun_id_for_shixuns.rb b/db/migrate/20200214022547_add_index_to_user_id_and_shixun_id_for_shixuns.rb
index 8248af5ff..acca274bd 100644
--- a/db/migrate/20200214022547_add_index_to_user_id_and_shixun_id_for_shixuns.rb
+++ b/db/migrate/20200214022547_add_index_to_user_id_and_shixun_id_for_shixuns.rb
@@ -3,7 +3,7 @@ class AddIndexToUserIdAndShixunIdForShixuns < ActiveRecord::Migration[5.2]
     shixun_members = ShixunMember.select("count(*) cnt, shixun_members.*").group(:user_id, :shixun_id).having("cnt > 1")
     puts "shixun_members: #{shixun_members.map{|sm| sm.id}}"
     shixun_members.each do |sm|
-      s = ShixunModify.where.not(id: sm.id).where(user_id: sm.user_id, shixun_id: sm.shixun_id)
+      s = ShixunMember.where.not(id: sm.id).where(user_id: sm.user_id, shixun_id: sm.shixun_id)
       puts "s: #{s.map{|sm| sm.id}}"
     end