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-rw-r--r--generator_templates/rails/post_deployment_migration/migration.rb22
1 files changed, 22 insertions, 0 deletions
diff --git a/generator_templates/rails/post_deployment_migration/migration.rb b/generator_templates/rails/post_deployment_migration/migration.rb
new file mode 100644
index 00000000000..1a7b8d5bf35
--- /dev/null
+++ b/generator_templates/rails/post_deployment_migration/migration.rb
@@ -0,0 +1,22 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class <%= migration_class_name %> < ActiveRecord::Migration
+ include Gitlab::Database::MigrationHelpers
+
+ DOWNTIME = false
+
+ # When using the methods "add_concurrent_index" or "add_column_with_default"
+ # you must disable the use of transactions as these methods can not run in an
+ # existing transaction. When using "add_concurrent_index" make sure that this
+ # method is the _only_ method called in the migration, any other changes
+ # should go in a separate migration. This ensures that upon failure _only_ the
+ # index creation fails and can be retried or reverted easily.
+ #
+ # To disable transactions uncomment the following line and remove these
+ # comments:
+ # disable_ddl_transaction!
+
+ def change
+ end
+end