public function placeholder($field, $column)
    {
        if (!is_array($field) && !in_array($field, $this->columnTypes)) {
            return ucfirst($field);
        }

        if (strpos($column, '[') > 0) {
            $nested = explode('[', str_replace(']', '', $column));
            $column = implode(' ', $nested);
        }

        $alt_name = (isset($field['alt_name'])) ? $field['alt_name'] : ucfirst($column);
        $placeholder = (isset($field['placeholder'])) ? $field['placeholder'] : $this->cleanString($alt_name);

        return $placeholder;
    }