I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!
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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 | |
elements = Nokogiri::HTML::DocumentFragment.parse(html_tag).css "label, input" | |
elements.each do |e| | |
if e.node_name.eql? 'label' | |
html = %(<div class="clearfix error">#{e}</div>).html_safe | |
elsif e.node_name.eql? 'input' | |
if instance.error_message.kind_of?(Array) | |
html = %(<div class="clearfix error">#{html_tag}<span class="help-inline"> #{instance.error_message.join(',')}</span></div>).html_safe |