POS-Server/config/initializers/field_error_proc.rb

##  Overriding ActionView::Base.field_error_proc in Rails

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
  html = %(<div class="field_with_errors">#{html_tag}</div>).html_safe
  # add nokogiri gem to Gemfile

  form_fields = [
    'textarea',
    'input',
    'select'
  ]

  elements = Nokogiri::HTML::DocumentFragment.parse(html_tag).css "label, " + form_fields.join(', ')
  
  elements.each do |e|
    if e.node_name.eql? 'label'
      html = %(<div class="has-error">#{e}</div>).html_safe
    elsif form_fields.include? e.node_name 
      if instance.error_message.kind_of?(Array) 
        html = %(<div class="has-error">#{html_tag}<span class="help-block">&nbsp;#{instance.error_message.uniq.join(', ')}</span></div>).html_safe unless html_tag =~ /hidden/
      else
        html = %(<div class="has-error">#{html_tag}<span class="help-block">&nbsp;#{instance.error_message}</span></div>).html_safe unless html_tag =~ /hidden/
      end
    end
  end
  html
end