Merge branch 'fix/migration-helpers-mysql-compatibility' into 'master'

Fix MySQL compatibility in zero downtime migration helpers

## What does this MR do?

This MR fixes MySQL for zero downtime migration helpers introduced in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3860

Closes #17711

See merge request !4239

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
+v 8.8.1 (unreleased)
+  - Fix MySQL compatibility in zero downtime migrations helpers
+
 v 8.8.0 (unreleased)
   - Implement GFM references for milestones (Alejandro Rodríguez)
   - Snippets tab under user profile. !4001 (Long Nguyen)

lib/gitlab/database/migration_helpers.rb

@@ -39,7 +39,15 @@ module Gitlab
       def update_column_in_batches(table, column, value)
         quoted_table = quote_table_name(table)
         quoted_column = quote_column_name(column)
-        quoted_value = quote(value)
+
+        ##
+        # Workaround for #17711
+        #
+        # It looks like for MySQL `ActiveRecord::Base.conntection.quote(true)`
+        # returns correct value (1), but `ActiveRecord::Migration.new.quote`
+        # returns incorrect value ('true'), which causes migrations to fail.
+        #
+        quoted_value = connection.quote(value)
         processed = 0
 
         total = exec_query("SELECT COUNT(*) AS count FROM #{quoted_table}").

spec/lib/gitlab/database/migration_helpers_spec.rb

@@ -2,15 +2,13 @@ require 'spec_helper'
 
 describe Gitlab::Database::MigrationHelpers, lib: true do
   let(:model) do
-    Class.new do
-      include Gitlab::Database::MigrationHelpers
-
-      def method_missing(name, *args, &block)
-        ActiveRecord::Base.connection.send(name, *args, &block)
-      end
-    end.new
+    ActiveRecord::Migration.new.extend(
+      Gitlab::Database::MigrationHelpers
+    )
   end
 
+  before { allow(model).to receive(:puts) }
+
   describe '#add_concurrent_index' do
     context 'outside a transaction' do
       before do
@@ -60,6 +58,12 @@ describe Gitlab::Database::MigrationHelpers, lib: true do
 
       expect(Project.where(import_error: 'foo').count).to eq(5)
     end
+
+    it 'updates boolean values correctly' do
+      model.update_column_in_batches(:projects, :archived, true)
+
+      expect(Project.where(archived: true).count).to eq(5)
+    end
   end
 
   describe '#add_column_with_default' do