In 2025 this article is still relevant, but there is another way to approach this, see below.

It seems like it’s easier to do the following to disable the behaviour entirely. Create an initializer file named config/initializers/field_with_errors.rb:

Ruby 
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ActionView::Base.field_error_proc = proc do |html_tag, instance|
  html_tag.html_safe
end

I had a minor issue with my Rails view when I had a list of radio buttons wrapped in labels. When there are form errors on a field like a radio button, Rails puts the CSS class .field_with_errors on that field. This causes some issues with alignment as seen in the screenshot below:

field with errors

All you need to do to fix this is make the .field_with_errors class display inline like so:

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.field_with_errors { display: inline; }