private function createNewCollection($relationship)
{
if ($relationship instanceof FieldRelationship) {
if ($relationship->isMultiple) {
if ($relationship->isPolymorphic) {
$this->relatedViaFieldOnEntity[$relationship->relationshipName] = PolymorphicCollection::forge(null);
} else {
$this->relatedViaFieldOnEntity[$relationship->relationshipName] = Collection::forge($relationship->modelType);
}
} else {
throw new InvalidTypeException('Single Field Relationships do not require a collection');
}
} else {
if ($relationship instanceof ReferencedRelationship) {
$this->relatedViaFieldOnExternalEntity[$relationship->relationshipName] = Collection::forge($relationship->modelType);
}
}
}
