def error_message_on(object, method, *args)
options = args.extract_options!
unless args.empty?
ActiveSupport::Deprecation.warn('error_message_on takes an option hash instead of separate ' +
'prepend_text, append_text, html_tag, and css_class arguments', caller)
options[:prepend_text] = args[0] || ''
options[:append_text] = args[1] || ''
options[:html_tag] = args[2] || 'div'
options[:css_class] = args[3] || 'formError'
end
options.reverse_merge!(:prepend_text => '', :append_text => '', :html_tag => 'div', :css_class => 'formError')
object = convert_to_model(object)
if (obj = (object.respond_to?(:errors) ? object : instance_variable_get("@#{object}"))) &&
(errors = obj.errors[method]).presence
content_tag(options[:html_tag],
(options[:prepend_text].html_safe << errors.first).safe_concat(options[:append_text]),
:class => options[:css_class]
)
else
''
end
end