Class Atk4\Data\Reference\HasOne

`extends`	`Reference`
`uses`	`FieldPropertiesTrait, JoinLinkTrait`

Atk4\Data\Reference uses DiContainerTrait, InitializerTrait, TrackableTrait
- Atk4\Data\Reference\HasOne uses FieldPropertiesTrait, JoinLinkTrait
  - Atk4\Data\Reference\HasOneSql

Located at data/src/Reference/HasOne.php

Methods
`protected`	`init(): void` Overrides `Atk4\Data\Reference::init()`	#
`protected`	`referenceOurValue(): Field` Returns our field or id field. Returns our field or id field.	#
`public`	`ref(Model $ourModel, array $defaults = []): Model` If our model is loaded, then return their model with respective loaded entity. If our model is loaded, then return their model with respective loaded entity. If our model is not loaded, then return their model with condition set. This can happen in case of deep traversal $model->ref('Many')->ref('one_id'), for example. Overrides `Atk4\Data\Reference::ref()` Overriden by `Atk4\Data\Reference\HasOneSql::ref()`	#

Methods inherited from Atk4\Data\Reference
`__construct(), setOwner(), assertReferenceValueNotNull(), getOurFieldName(), getOurField(), getOurFieldValue(), getTheirFieldName(), onHookToOurModel(), onHookToTheirModel(), getDesiredName(), getOurModel(), createTheirModel(), initTableAlias(), addToPersistence(), getDefaultPersistence(), refModel(), __debugInfo(), getOwner()`

Methods used from Atk4\Core\DiContainerTrait
`setDefaults(), setMissingProperty(), assertInstanceOf(), _fromSeedPrecheck(), fromSeed(), fromSeedUnsafe()`

Methods used from Atk4\Core\InitializerTrait
`isInitialized(), assertIsInitialized(), invokeInit()`

Methods used from Atk4\Core\TrackableTrait
`issetOwner(), unsetOwner(), destroy()`

Methods used from Atk4\Data\Model\JoinLinkTrait
`hasJoin(), getJoin()`

Properties inherited from Atk4\Data\Reference
`$tableAlias, $link, $model, $ourField, $theirField, $checkTheirType, $caption`

Properties used from Atk4\Core\InitializerTrait
`$_initialized`

Properties used from Atk4\Core\TrackableTrait
`$_owner, $shortName`

Properties used from Atk4\Data\Model\FieldPropertiesTrait
`$actual, $neverPersist, $neverSave, $type, $nullable, $required, $enum, $values, $referenceLink, $system, $default, $readOnly, $caption, $ui`

Properties used from Atk4\Data\Model\JoinLinkTrait
`$joinName`