db/migrate/20170502140503_create_index_ci_builds_auto_canceled_by_id.rb


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class CreateIndexCiBuildsAutoCanceledById < ActiveRecord::Migration[4.2]
  include Gitlab::Database::MigrationHelpers

  DOWNTIME = false

  disable_ddl_transaction!

  def up
    # MySQL would already have the index
    unless index_exists?(:ci_builds, :auto_canceled_by_id)
      add_concurrent_index(:ci_builds, :auto_canceled_by_id)
    end
  end

  def down
    # We cannot remove index for MySQL because it's needed for foreign key
    if Gitlab::Database.postgresql?
      remove_concurrent_index(:ci_builds, :auto_canceled_by_id)
    end
  end
end