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<?php
namespace Illuminate\Database\Eloquent\Relations\Concerns;
use Illuminate\Database\Eloquent\Model;
trait SupportsDefaultModels
{
/**
* Indicates if a default model instance should be used.
*
* Alternatively, may be a Closure or array.
*
* @var \Closure|array|bool
*/
protected $withDefault;
/**
* Make a new related instance for the given model.
*
* @param \Illuminate\Database\Eloquent\Model $parent
* @return \Illuminate\Database\Eloquent\Model
*/
abstract protected function newRelatedInstanceFor(Model $parent);
/**
* Return a new model instance in case the relationship does not exist.
*
* @param \Closure|array|bool $callback
* @return $this
*/
public function withDefault($callback = true)
{
$this->withDefault = $callback;
return $this;
}
/**
* Get the default value for this relation.
*
* @param \Illuminate\Database\Eloquent\Model $parent
* @return \Illuminate\Database\Eloquent\Model|null
*/
protected function getDefaultFor(Model $parent)
{
if (! $this->withDefault) {
return;
}
$instance = $this->newRelatedInstanceFor($parent);
if (is_callable($this->withDefault)) {
return call_user_func($this->withDefault, $instance, $parent) ?: $instance;
}
if (is_array($this->withDefault)) {
$instance->forceFill($this->withDefault);
}
return $instance;
}
}