module ActionController::Rescue

def rescue_action_with_fast_errors(exception)
  if use_rails_error_handling?
    rescue_action_without_fast_errors exception
  else
    raise exception
  end
end

def use_rails_error_handling!
  @use_rails_error_handling = true
end

def use_rails_error_handling?
  @use_rails_error_handling ||= false
end