fab-manager/db/migrate/20190107111749_protect_accounting_periods.rb

class ProtectAccountingPeriods < ActiveRecord::Migration

  # PostgreSQL only
  def up
    return if Rails.env.development? || Rails.env.test?

    execute("CREATE RULE accounting_periods_del_protect AS ON DELETE TO #{AccountingPeriod.arel_table.name} DO INSTEAD NOTHING;")
    execute("CREATE RULE accounting_periods_upd_protect AS ON UPDATE TO #{AccountingPeriod.arel_table.name} DO INSTEAD NOTHING;")
  end

  def down
    execute("DROP RULE IF EXISTS accounting_periods_del_protect ON #{AccountingPeriod.arel_table.name};")
    execute("DROP RULE IF EXISTS accounting_periods_upd_protect ON #{AccountingPeriod.arel_table.name};")
  end
end