def captcha_challenge(object_name, options = {})
      options.symbolize_keys!

      object = options.delete(:object)
      sanitized_object_name = object_name.to_s.gsub(/\]\[|[^-a-zA-Z0-9:.]/, "_").sub(/_$/, "")

      ValidatesCaptcha.provider.render_challenge sanitized_object_name, object, options
    end
def captcha_challenge(object_name, options = {})
      options.symbolize_keys!

      object = options.delete(:object)
      sanitized_object_name = object_name.to_s.gsub(/\]\[|[^-a-zA-Z0-9:.]/, "_").sub(/_$/, "")

      ValidatesCaptcha.provider.render_challenge sanitized_object_name, object, options
    end
Returns the captcha challenge.

 Internally calls the +render_challenge+ method of ValidatesCaptcha#provider.