Illuminate\Database\Eloquent\Builder::first PHP 메소드

    public function first($columns = ['*'])
    {
        return $this->take(1)->get($columns)->first();
    }

 /**
  * @inheritdoc
  */
 public function getByCredentials(array $credentials)
 {
     foreach ($credentials as $key => $value) {
         if (strpos($key, 'password') === false) {
             $this->queryBuilder->where($key, $value);
         }
     }
     return $this->queryBuilder->first();
 }