formtastic.rb

module Formtastic
  module Inputs
    module Base
      module Errors
        # override
        def error_sentence_html
          error_class = builder.default_inline_error_class
          template.content_tag(:p, full_message_errors.to_sentence.html_safe, :class => error_class)
        end

        def full_message_errors
          return [] unless object && object.respond_to?(:errors)

          errors = error_keys.each_with_object([]) do |at, a|
            e = object.errors.full_messages_for(at)
            a.push(e) if e.present?
          end

          errors.flatten.compact.uniq
        end
      end
    end
  end
end