semantic_error_messages_for.rb

# Semantic error messages for is used with formtastic and it will generate error messages for attributes you
# are passing including base.
# You can use it like this:
# - semantic_form_for (...)
#   = semantic_error_messages_for @model, :attribute, :another_one

def semantic_error_messages_for(object, *methods)
  full_errors = methods.inject([]) do |array, method|
    attribute = object.class.human_attribute_name(method)
    errors = Array(object.errors.on(method)).to_sentence
    errors.present? ? array << [attribute, errors].join(" ") : array ||= []
  end
  full_errors << object.errors.on_base
  full_errors.flatten!
  full_errors.compact!
  return nil if full_errors.blank?
  content_tag(:fieldset, :class => "errors") do
    content_tag(:ol) do
      full_errors.map { |error| content_tag(:li, error) }.join
    end
  end
end