Schedule full build stage migration in the background

For builds that are still missing `stage_id`.

1 files changed, 20 insertions, 0 deletions

diff --git a/db/post_migrate/20171205101928_schedule_build_stage_migration.rb b/db/post_migrate/20171205101928_schedule_build_stage_migration.rb
new file mode 100644
index 00000000000..60293c60e8e
--- /dev/null
+++ b/db/post_migrate/20171205101928_schedule_build_stage_migration.rb
@@ -0,0 +1,20 @@
+class ScheduleBuildStageMigration < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  MIGRATION = 'MigrateBuildStage'.freeze
+  BATCH = 10_000
+
+  class Build < ActiveRecord::Base
+    include EachBatch
+    self.table_name = 'ci_builds'
+  end
+
+  def change
+    Build.where('stage_id IS NULL').each_batch(of: BATCH) do |builds, index|
+      builds.pluck(:id).map { |id| [MIGRATION, [id]] }.tap do |migrations|
+        BackgroundMigrationWorker.perform_bulk_in(index.minutes, migrations)
+      end
+    end
+  end
+end