app/helpers/form_helper.rb


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module FormHelper
  def form_errors(model)
    return unless model.errors.any?

    pluralized = 'error'.pluralize(model.errors.count)
    headline   = "The form contains the following #{pluralized}:"

    content_tag(:div, class: 'alert alert-danger', id: 'error_explanation') do
      content_tag(:h4, headline) <<
        content_tag(:ul) do
          model.errors.full_messages
            .map { |msg| content_tag(:li, msg) }
            .join
            .html_safe
        end
    end
  end
end