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<?php
namespace Illuminate\Database\Eloquent\Relations;
use Closure;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Collection;
class HasOne extends HasOneOrMany
{
/**
* Indicates if a default model instance should be used.
*
* Alternatively, may be a Closure to execute to retrieve default value.
*
* @var \Closure|bool
*/
protected $withDefault;
/**
* Return a new model instance in case the relationship does not exist.
*
* @param \Closure|bool $callback
* @return $this
*/
public function withDefault($callback = true)
{
$this->withDefault = $callback;
return $this;
}
/**
* Get the results of the relationship.
*
* @return mixed
*/
public function getResults()
{
return $this->query->first() ?: $this->getDefaultFor($this->parent);
}
/**
* Initialize the relation on a set of models.
*
* @param array $models
* @param string $relation
* @return array
*/
public function initRelation(array $models, $relation)
{
foreach ($models as $model) {
$model->setRelation($relation, $this->getDefaultFor($model));
}
return $models;
}
/**
* Match the eagerly loaded results to their parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
public function match(array $models, Collection $results, $relation)
{
return $this->matchOne($models, $results, $relation);
}
/**
* Get the default value for this relation.
*
* @param \Illuminate\Database\Eloquent\Model $model
* @return \Illuminate\Database\Eloquent\Model|null
*/
protected function getDefaultFor(Model $model)
{
if (is_callable($this->withDefault)) {
return call_user_func($this->withDefault);
} elseif ($this->withDefault === true) {
return $this->related->newInstance()->setAttribute(
$this->getPlainForeignKey(), $model->getAttribute($this->localKey)
);
}
}
}
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