protected function handle_prerequisites() {

		foreach ( array( 'course', 'lesson' ) as $obj_type ) {

			$ids = ! empty( $this->tempids[ $obj_type ] ) ? $this->tempids[ $obj_type ] : array();

			// Courses have two kinds of prereqs.
			$has_prereq_param = ( 'course' === $obj_type ) ? 'course' : null;

			// Loop through all then created lessons.
			foreach ( $ids as $old_id => $new_id ) {

				// Instantiate the new instance of the object.
				$obj = llms_get_post( $new_id );

				// If this is a course and there isn't a source or the source doesn't match the current site.
				// We should remove the track prerequisites.
				if ( 'course' === $obj_type && ( ! isset( $raw['_source'] ) || get_site_url() !== $raw['_source'] ) ) {

					// Remove prereq track settings.
					if ( $obj->has_prerequisite( 'course_track' ) ) {
						$obj->set( 'prerequisite_track', 0 );
						if ( ! $obj->has_prerequisite( 'course' ) ) {
							$obj->set( 'has_prerequisite', 'no' );
						}
					}
				}

				// If the object has a prereq.
				if ( $obj->has_prerequisite( $has_prereq_param ) ) {

					// Get the old preqeq's id.
					$old_prereq = $obj->get( 'prerequisite' );

					// If the old prereq is a key in the array of created objects.
					// We can replace it with the new id.
					if ( in_array( $old_prereq, array_keys( $ids ) ) ) {

						$obj->set( 'prerequisite', $ids[ $old_prereq ] );

					} elseif ( ! isset( $raw['_source'] ) || get_site_url() !== $raw['_source'] ) {

						$obj->set( 'has_prerequisite', 'no' );
						$obj->set( 'prerequisite', 0 );

					} else {
						$post = get_post( $old_prereq );
						// Post doesn't exist or the post type doesn't match, get rid of it.
						if ( ! $post || $obj_type !== $post->post_type ) {

							$obj->set( 'has_prerequisite', 'no' );
							$obj->set( 'prerequisite', 0 );

						}
					}
				}
			}
		}

	}