From 514ceaf73eecc3bb6c0bccbf7c9c470606ea254a Mon Sep 17 00:00:00 2001
From: daiao <358551898@qq.com>
Date: Fri, 14 Feb 2020 10:55:46 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E7=B4=A2=E5=BC=95?=
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---
 ...add_index_to_user_id_and_shixun_id_for_shixuns.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 db/migrate/20200214022547_add_index_to_user_id_and_shixun_id_for_shixuns.rb

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
new file mode 100644
index 000000000..66e72a274
--- /dev/null
+++ b/db/migrate/20200214022547_add_index_to_user_id_and_shixun_id_for_shixuns.rb
@@ -0,0 +1,12 @@
+class AddIndexToUserIdAndShixunIdForShixuns < ActiveRecord::Migration[5.2]
+  def change
+    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|
+      ShixunModify.find_by(id: sm.id).delete
+    end
+
+    add_index :shixun_members, [:user_id, :shixun_id], unique: true
+
+  end
+end