From 01a63f8b4b3d193ecf9d25a8f7a0365c2902f0aa Mon Sep 17 00:00:00 2001
From: Guo Xiang Tan <tgx_world@hotmail.com>
Date: Tue, 24 Jul 2018 15:18:57 +0800
Subject: [PATCH] Drop `EmailLogs#topic_id`.

---
 db/fixtures/000_delayed_drops.rb                      | 11 +++++++++++
 .../20180724070554_drop_topic_id_on_email_logs.rb     |  5 +++++
 2 files changed, 16 insertions(+)
 create mode 100644 db/migrate/20180724070554_drop_topic_id_on_email_logs.rb

diff --git a/db/fixtures/000_delayed_drops.rb b/db/fixtures/000_delayed_drops.rb
index 2cc74cc605d..edf88f772dd 100644
--- a/db/fixtures/000_delayed_drops.rb
+++ b/db/fixtures/000_delayed_drops.rb
@@ -239,4 +239,15 @@ Migration::ColumnDropper.drop(
   }
 )
 
+Migration::ColumnDropper.drop(
+  table: 'email_logs',
+  after_migration: 'DropTopicIdOnEmailLogs',
+  columns: %w{
+    topic_id
+  },
+  on_drop: ->() {
+    STDERR.puts "Removing superflous email_logs columns!"
+  }
+)
+
 Discourse.reset_active_record_cache
diff --git a/db/migrate/20180724070554_drop_topic_id_on_email_logs.rb b/db/migrate/20180724070554_drop_topic_id_on_email_logs.rb
new file mode 100644
index 00000000000..199c24bd431
--- /dev/null
+++ b/db/migrate/20180724070554_drop_topic_id_on_email_logs.rb
@@ -0,0 +1,5 @@
+class DropTopicIdOnEmailLogs < ActiveRecord::Migration[5.2]
+  def change
+    remove_index :email_logs, :topic_id
+  end
+end