src/Adapter/AbstractResourceAdapter.php
protected function fillRelationship(
        $record,
        $field,
        array $relationship,
        EncodingParametersInterface $parameters
    ) {
        $relation = $this->getRelated($field);

        $relation->update($record, $relationship, $parameters);
    }
protected function fillRelationship(
        $record,
        $field,
        array $relationship,
        EncodingParametersInterface $parameters
    ) {
        $relation = $this->getRelated($field);

        $relation->update($record, $relationship, $parameters);
    }
Fill a relationship from a resource object.

@param $record
@param $field
@param array $relationship
@param EncodingParametersInterface $parameters