class RuboCop::Cop::Rails::ActionControllerFlashBeforeRender

def on_send(flash_node)
  return unless flash_assignment?(flash_node)
  return unless followed_by_render?(flash_node)
  return unless instance_method_or_block?(flash_node)
  return unless inherit_action_controller_base?(flash_node)
  add_offense(flash_node) do |corrector|
    corrector.replace(flash_node, 'flash.now')
  end
end