validations.rb

    # Grabs errors from a json response.
    def from_json(json, save_cache = false)
      array = Array.wrap(ActiveSupport::JSON.decode(json)['errors']) rescue []
      from_array array, save_cache
    end

    def from_array(messages, save_cache = false)
      clear unless save_cache
      humanized_attributes = Hash[@base.attributes.keys.map { |attr_name| [attr_name.humanize, attr_name] }]
      messages.each do |message|
        attr_message = humanized_attributes.keys.detect do |attr_name|
          if message[0, attr_name.size + 1] == "#{attr_name} "
            add humanized_attributes[attr_name], message[(attr_name.size + 1)..-1]
          end
        end

        self[:base] << message if attr_message.nil?
      end
    end