code: public function queryToMany($relation, EncodingParametersInterface $parameters)
      {
          return $this->queryAllOrOne(
              $relation->newQuery(),
              $this->getQueryParameters($parameters)
          );
      }
docs: Query the resource when it appears in a to-many relation of a parent resource.
  
  For example, a request to `/posts/1/comments` will invoke this method on the
  comments adapter.
  
  @param Relations\BelongsToMany|Relations\HasMany|Relations\HasManyThrough|Builder $relation
  @param EncodingParametersInterface $parameters
  @return mixed
  @todo default pagination causes a problem with polymorphic relations??