module ActionController::ImplicitRender

def default_render
  if template_exists?(action_name.to_s, _prefixes, variants: request.variant)
    render
  elsif any_templates?(action_name.to_s, _prefixes)
    message = "#{self.class.name}\##{action_name} is missing a template " \
      "for this request format and variant.\n" \
      "\nrequest.formats: #{request.formats.map(&:to_s).inspect}" \
      "\nrequest.variant: #{request.variant.inspect}"
    raise ActionController::UnknownFormat, message
  elsif interactive_browser_request?
    message = "#{self.class.name}\##{action_name} is missing a template for request formats: #{request.formats.map(&:to_s).join(',')}"
    raise ActionController::MissingExactTemplate.new(message, self.class, action_name)
  else
    logger.info "No template found for #{self.class.name}\##{action_name}, rendering head :no_content" if logger
    super
  end
end