Support for post deployment migrationsbackground-migrations

These are regular Rails migrations that are executed by default. A user
can opt-out of these migrations by setting an environment variable
during the deployment process.

Fixes gitlab-org/gitlab-ce#22133

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/generators/rails/post_deployment_migration/post_deployment_migration_generator.rb b/lib/generators/rails/post_deployment_migration/post_deployment_migration_generator.rb
new file mode 100644
index 00000000000..392bd640192
--- /dev/null
+++ b/lib/generators/rails/post_deployment_migration/post_deployment_migration_generator.rb
@@ -0,0 +1,13 @@
+module Rails
+  class PostDeploymentMigrationGenerator < Rails::Generators::NamedBase
+    def create_migration_file
+      timestamp = Time.now.strftime('%Y%m%d%H%I%S')
+
+      template "migration.rb", "db/post_migrate/#{timestamp}_#{file_name}.rb"
+    end
+
+    def migration_class_name
+      file_name.camelize
+    end
+  end
+end