[Rails] Changing the way form fields with errors are displayed

[Fresh Mix]

What file I must to edit?


7.1. Changing the way form fields with errors are displayed
http://guides.rubyonrails.org/activerecord_validations_callbacks.html

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
  if instance.error_message.kind_of?(Array)
    %(#{html_tag}<span class='validation-error'>&nbsp;
      #{instance.error_message.join(',')}</span>)
  else
    %(#{html_tag}<span class='validation-error'>&nbsp;
      #{instance.error_message}</span>)
  end
end
-- 
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