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<?php
/**
* Trait for models that may have a lesson attached.
*
* @since 4.6.0
*
* @package LearnDash\Core
*/
/** NOTICE: This code is currently under development and may not be stable.
* Its functionality, behavior, and interfaces may change at any time without notice.
* Please refrain from using it in production or other critical systems.
* By using this code, you assume all risks and liabilities associated with its use.
* Thank you for your understanding and cooperation.
**/
namespace LearnDash\Core\Models\Traits;
use LearnDash\Core\Models\Lesson;
/**
* Trait for models that may have a lesson attached.
*
* @since 4.6.0
*/
trait Has_Lesson {
/**
* Returns the related lesson or null.
*
* @since 4.6.0
*
* @return Lesson|null
*/
protected function get_lesson(): ?Lesson {
return $this->memoize(
function (): ?Lesson {
$lesson_id = (int) learndash_get_lesson_id( $this->get_id() );
if ( $lesson_id <= 0 ) {
return null;
}
$lesson = Lesson::find( $lesson_id );
if ( ! $lesson ) {
return null;
}
if ( $this->memoization_is_enabled() ) {
$lesson->enable_memoization();
}
return $lesson;
}
);
}
}