public function readdField($field)
    {
        $this->checkValidLoader();

        foreach ($this->loaders as $loader => $fields) {
            if (in_array($field, $this->loaders[ $loader ])) {
                array_splice($this->loaders[ $loader ], array_search($field, $this->loaders[ $loader ]), 1);
            }
        }

        $this->addField($field);

        return $this;
    }