$wall_post_obj->getAlbum()->getId()

$wall_post_obj->getAlbum()->getName()

$qb_1 = $em->createQueryBuilder();
        $q_1 = $qb_1->select('wp, fromUsr.id,
                              fromUsr.professional_image,
                              fromUsr.gender,
                              fromUsr.firstname,
                              fromUsr.lastname')
        ->from( 'Entitieswall_post', 'wp' )
        ->LeftJoin( 'wp.wall_postsFrom_user', 'fromUsr' )
        ->where( 'wp.id IN (:selected_wp_ids_r)' )
        ->setParameter( 'selected_wp_ids_r', $selected_wp_ids_r )
        ->orderBy( 'wp.last_activity_datetime', 'DESC' );

        // wallpost Comments join
        $q_1->addSelect( 'wall_comments, comment_user' );
        $q_1->LeftJoin( 'wp.wall_postsComment', 'wall_comments' );
        $q_1->LeftJoin( 'wall_comments.commentsIlook_user', 'comment_user' );

        // wallpost Likes join
        $q_1->addSelect( 'likes' );
        $q_1->LeftJoin( 'wp.wall_postsLikes', 'likes' );
        $q_1->LeftJoin( 'likes.likesLiked_by', 'likedByUser' );

        $q_1 = $q_1->getQuery()->getResult ();