Support for referencing entities without foreign keys

[PetrAda]

Describe the bug
I can write * @property ?File $image {m:1 File, oneSided=true}
but if the backing ID is an invalid value eg 22. and a record with the id 22 does not exist the HasOne object throws an exception even though the property is nullable.

Expected behavior
NOT

abstract class HasOne implements IRelationshipContainer{
...
if (!$this->metadata->isNullable && !$allowNull) {
				throw new NullValueException($this->metadata);
			}
			return null;

		} elseif (is_scalar($entity)) {
			return $this->getTargetRepository()->getByIdChecked($entity);

		} 
...
}

YES

abstract class HasOne implements IRelationshipContainer{
...
if (!$this->metadata->isNullable && !$allowNull) {
				throw new NullValueException($this->metadata);
			}
			return null;

		} elseif (is_scalar($entity)) {
$repo = $this->getTargetRepository();
if ($this->metadata->isNullable || $allowNull) {
				return $repo->getById($entity)
			}
			return $repo->getByIdChecked($entity);

		} 
...
}

Versions::

• Database: [PERCONA]
• Orm: 3.0
• Dbal: Dbal 3.0

[hrach]

So, if I understand the report correctly, this is not about supporting relationships without foreign keys, but with invalid data.

THB, I fail to see what's valuable / wanted to have such a state. Since the entity has the hasValue() method, it would return true, and suddenly it would return null - that is really unexpected.

TLDR: I'm not convinced this should be supported. What is your use case?

---

Note: Currently, foreign keys are only a helper for stripping the ID suffix from entity names.