Use bulk for migration

.rubocop.yml

@@ -67,6 +67,12 @@ Style/OptionHash:
   Exclude:
     - lib/redmine_messenger/patches/*.rb
 
+# postgresql and mysql are supported
+# autodetect does not work without database configuration
+Rails/BulkChangeTable:
+  Enabled: true
+  Database: postgresql
+
 Style/ReturnNil:
   Enabled: true
 

db/migrate/003_add_private_settings.rb

@@ -2,7 +2,9 @@
 
 class AddPrivateSettings < ActiveRecord::Migration[4.2]
   def change
-    add_column :messenger_settings, :post_private_contacts, :integer, default: 0, null: false
-    add_column :messenger_settings, :post_private_db, :integer, default: 0, null: false
+    change_table :messenger_settings, bulk: true do |t|
+      t.integer :post_private_contacts, default: 0, null: false
+      t.integer :post_private_db, default: 0, null: false
+    end
   end
 end