public function findWhere($where, $columns = ['*'], $or = false)
    {
        $model = $this->query();

        foreach ($where as $field => $value) {

            if ($value instanceof Closure) {

                $model = ( ! $or)
                    ? $model->where($value)
                    : $model->orWhere($value);

            } elseif (is_array($value)) {

                if (count($value) === 3) {

                    list($field, $operator, $search) = $value;

                    $model = ( ! $or)
                        ? $model->where($field, $operator, $search)
                        : $model->orWhere($field, $operator, $search);

                } elseif (count($value) === 2) {

                    list($field, $search) = $value;

                    $model = ( ! $or)
                        ? $model->where($field, $search)
                        : $model->orWhere($field, $search);
                }

            } else {
                $model = ( ! $or)
                    ? $model->where($field, $value)
                    : $model->orWhere($field, $value);
            }
        }

        return $model->get($columns);
    }