public function add($attribute, ...$values)
    {
        foreach ($values as $value) {
            if ($this->has($attribute)) {
                $attribute = $this->resolveAttributeName($attribute);
                $this->attributes[$attribute] = $this->addAttributeValue($this->attributes[$attribute], $value);
            } else {
                $this->attributes[$attribute] = $value;
            }
            $this->batches->add(new Batch(Batch::TYPE['ADD'], $attribute, $value));
        }

        return $this;
    }