Algo-Web / POData-Laravel

     *

     * @return object|null The related resource if found else null

     */

    public function getRelatedResourceReference(

        ResourceSet $sourceResourceSet,

        $sourceEntityInstance,

        ResourceSet $targetResourceSet,

        ResourceProperty $targetProperty

    ) {

        if (!($sourceEntityInstance instanceof Model)) {

            throw new InvalidArgumentException('Source entity must be an Eloquent model.');

        }

        $this->checkSourceInstance($sourceEntityInstance);

        $propertyName = $targetProperty->getName();

        return $sourceEntityInstance->$propertyName;

    }

    /**

     * Gets a related entity instance from an entity set identified by a key

     *

     * @return object|null Returns entity instance if found else null

     */

    public function getResourceFromRelatedResourceSet(

        ResourceSet $sourceResourceSet,

        $sourceEntityInstance,

        ResourceSet $targetResourceSet,

        ResourceProperty $targetProperty,

        KeyDescriptor $keyDescriptor

    ) {

        if (!($sourceEntityInstance instanceof Model)) {

            throw new InvalidArgumentException('Source entity must be an Eloquent model.');

        }

        $propertyName = $targetProperty->getName();

        return $this->getResource(null, $keyDescriptor, [], $sourceEntityInstance->$propertyName);

    }

    /**