private function model()
    {
        $this->relationship(config('amranidev.config.model').DIRECTORY_SEPARATOR.ucfirst(str_singular($this->tables['first'])).'.php', $this->tables['second']);
        $this->relationship(config('amranidev.config.model').DIRECTORY_SEPARATOR.ucfirst(str_singular($this->tables['second'])).'.php', $this->tables['first']);
    }