From eb086a4bfd2495168483a2652571f247e6b768a5 Mon Sep 17 00:00:00 2001
From: Sean McGivern <sean@gitlab.com>
Date: Tue, 19 Jun 2018 17:18:15 +0100
Subject: Disallow methods that copy data on large tables

{change_column_type,rename_column}_concurrently both copy data from one column
to another during a migration, which should not be done on GitLab.com. Instead,
we should use background migrations.
---
 rubocop/cop/migration/update_large_table.rb | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'rubocop')

diff --git a/rubocop/cop/migration/update_large_table.rb b/rubocop/cop/migration/update_large_table.rb
index bb14d0f4f56..e3e3de0a4d7 100644
--- a/rubocop/cop/migration/update_large_table.rb
+++ b/rubocop/cop/migration/update_large_table.rb
@@ -34,8 +34,15 @@ module RuboCop
           users
         ].freeze
 
+        BATCH_UPDATE_METHODS = %w[
+          :add_column_with_default
+          :change_column_type_concurrently
+          :rename_column_concurrently
+          :update_column_in_batches
+        ].join(' ').freeze
+
         def_node_matcher :batch_update?, <<~PATTERN
-          (send nil? ${:add_column_with_default :update_column_in_batches} $(sym ...) ...)
+          (send nil? ${#{BATCH_UPDATE_METHODS}} $(sym ...) ...)
         PATTERN
 
         def on_send(node)
-- 
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