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Edit File: class-lp-lesson-curd.php

<?php
/**
 * Class LP_Lesson_CURD
 *
 * @author  ThimPress
 * @package LearnPress/Classes/CURD
 * @since   3.0.0
 */

/**
 * Prevent loading this file directly
 */
defined( 'ABSPATH' ) || exit();

if ( ! class_exists( 'LP_Lesson_CURD' ) ) {

/**
	 * Class LP_Lesson_CURD
	 */
	class LP_Lesson_CURD extends LP_Object_Data_CURD implements LP_Interface_CURD {

/**
		 * Create lesson, with default meta.
		 *
		 * @param $args
		 *
		 * @return int|WP_Error
		 */
		public function create( &$args ) {
			$args = wp_parse_args(
				$args,
				array(
					'id'      => '',
					'status'  => 'publish',
					'title'   => esc_html__( 'New Lesson', 'learnpress' ),
					'content' => '',
					'author'  => learn_press_get_current_user_id(),
				)
			);

$lesson_id = wp_insert_post(
				array(
					'ID'           => $args['id'],
					'post_type'    => LP_LESSON_CPT,
					'post_status'  => $args['status'],
					'post_title'   => $args['title'],
					'post_content' => $args['content'],
					'post_author'  => $args['author'],
				)
			);

if ( $lesson_id ) {
				// add default meta for new lesson
				$default_meta = LP_Lesson::get_default_meta();

if ( is_array( $default_meta ) ) {
					foreach ( $default_meta as $key => $value ) {
						update_post_meta( $lesson_id, '_lp_' . $key, $value );
					}
				}
			}

return $lesson_id;
		}

/**
		 * @param object $lesson
		 */
		public function update( &$lesson ) {
			// TODO: Implement update() method.
		}

/**
		 * Delete lesson.
		 *
		 * @since 3.0.0
		 *
		 * @param object $lesson_id
		 */
		public function delete( &$lesson_id ) {
			// course curd
			$curd = new LP_Course_CURD();

// remove lesson from course items
			$curd->remove_item( $lesson_id );
		}

/**
		 * Duplicate lesson.
		 *
		 * @since 3.0.0
		 *
		 * @param $lesson_id
		 * @param array     $args
		 *
		 * @return mixed|WP_Error
		 */
		public function duplicate( &$lesson_id, $args = array() ) {
			if ( ! $lesson_id ) {
				return new WP_Error( '0', 'Oops! ID not found' );
			}

if ( get_post_type( $lesson_id ) != LP_LESSON_CPT ) {
				return new WP_Error( '1', 'Op! The lesson does not exist' );
			}

$user_id = $args['meta_input']['_lp_user'] ?? get_current_user_id();
			// ensure that user can create lesson
			if ( ! user_can( $user_id, 'edit_posts' ) ) {
				return new WP_Error( '2', 'Sorry! You don\'t have permission to duplicate this lesson' );
			}

// duplicate lesson
			$new_lesson_id = learn_press_duplicate_post( $lesson_id, $args );

if ( ! $new_lesson_id || is_wp_error( $new_lesson_id ) ) {
				return new WP_Error( '3', 'Sorry! Failed to duplicate lesson!' );
			}

do_action( 'learn-press/item/after-duplicate', $lesson_id, $new_lesson_id, $args );
			return $new_lesson_id;
		}

/**
		 * Load lesson data.
		 *
		 * @since 3.0.0
		 *
		 * @param object $lesson
		 *
		 * @return object
		 * @throws Exception
		 */
		public function load( &$lesson ) {
			// lesson id
			$id = $lesson->get_id();

if ( ! $id || get_post_type( $id ) !== LP_LESSON_CPT ) {
				throw new Exception( sprintf( __( 'Invalid lesson with ID "%d".', 'learnpress' ), $id ) );
			}

$lesson->set_data(
				array(
					'preview' => get_post_meta( $id, '_lp_preview', true ),
				)
			);

return $lesson;
		}
	}

}