RelationManager::getRelations

public function getRelations(int $entityTypeId): Relation\Collection
{
	if (isset($this->relationsCache[$entityTypeId]))
	{
		return $this->relationsCache[$entityTypeId];
	}

	$parentRelations = $this->getParentRelations($entityTypeId);
	$this->relationsCache[$entityTypeId] = $parentRelations->merge($this->getChildRelations($entityTypeId));

	return $this->relationsCache[$entityTypeId];
}