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<?php |
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/** |
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* Spiral, Core Components |
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* |
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* @author Wolfy-J |
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*/ |
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namespace Spiral\ORM\Entities\Relations; |
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use Spiral\Database\Exceptions\QueryException; |
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use Spiral\ORM\Entities\Relations\Traits\SyncedTrait; |
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use Spiral\ORM\Exceptions\SelectorException; |
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use Spiral\ORM\Helpers\AliasDecorator; |
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use Spiral\ORM\ORMInterface; |
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use Spiral\ORM\Record; |
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use Spiral\ORM\RecordInterface; |
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/** |
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* Provides ability to create cached instances of related data. |
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*/ |
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abstract class SingularRelation extends AbstractRelation |
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{ |
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use SyncedTrait; |
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/** |
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* Create placeholder model when relation is empty. |
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*/ |
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const CREATE_PLACEHOLDER = false; |
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/** |
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* @var RecordInterface |
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*/ |
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protected $instance; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function hasRelated(): bool |
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{ |
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if (!$this->isLoaded()) { |
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//Lazy loading our relation data |
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$this->loadData(); |
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} |
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return !empty($this->instance); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* Returns associated parent or NULL if none associated. |
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*/ |
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public function getRelated() |
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{ |
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if ($this->instance instanceof RecordInterface) { |
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return $this->instance; |
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} |
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if (!$this->isLoaded()) { |
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//Lazy loading our relation data |
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$this->loadData(); |
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} |
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if (!empty($this->instance)) { |
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return $this->instance; |
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} |
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if (!empty($this->data)) { |
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$this->instance = $this->orm->make( |
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$this->getClass(), |
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$this->data, |
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ORMInterface::STATE_LOADED, |
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true |
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); |
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} elseif ($this->isPlaceholderNeeded()) { |
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//Stub instance |
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$this->instance = $this->orm->make( |
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$this->getClass(), |
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[], |
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ORMInterface::STATE_NEW |
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); |
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} |
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return $this->instance; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws SelectorException |
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* @throws QueryException |
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*/ |
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protected function loadData() |
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{ |
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$this->loaded = true; |
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$innerKey = $this->key(Record::INNER_KEY); |
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if (empty($this->parent->getField($innerKey))) { |
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//Unable to load |
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return; |
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} |
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$selector = $this->orm->selector($this->getClass()); |
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$decorator = new AliasDecorator($selector, 'where', $selector->getAlias()); |
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$decorator->where($this->whereStatement()); |
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$this->data = $selector->fetchData(); |
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if (!empty($this->data[0])) { |
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//Use first result |
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$this->data = $this->data[0]; |
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} |
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} |
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/** |
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* Where statement to load outer record. |
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* |
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* @return array |
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*/ |
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protected function whereStatement(): array |
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{ |
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return [ |
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$this->key(Record::OUTER_KEY) => $this->parent->getField($this->key(Record::INNER_KEY)) |
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]; |
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} |
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/** |
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* @return bool |
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*/ |
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protected function isPlaceholderNeeded(): bool |
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{ |
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return static::CREATE_PLACEHOLDER; |
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} |
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} |
spiral /
orm
