functions.php

<?php add_action('admin_head', 'c7_admin_head');
function c7_admin_head() { ?>
	<style>
		.select-autores {
			width: 100%;
		}
		#asignar-autores-modal {
			position: fixed;
			width: 300px;
			min-height: 300px;
			z-index: 9999999;
			background: #fff;
			left: 50%;
			margin-left: -150px;
			margin-top: -150px;
			top: 50%;
			border: 1px solid #ddd;
			padding: 20px 20px 40px;
			box-shadow: 0px 2px 13px rgba(0, 0, 0, 0.4);
		}
	</style>
<?php }

add_action('admin_footer', 'c7_admin_footer');
function c7_admin_footer() { ?>
	<div id="asignar-autores-modal" style="display:none;">
		<form method="post">
			<h2>Asignar autores a múltiples cursos</h2>
			<p>Cursos seleccionados</p>
			<p id="cursos-seleccionados"></p>
			<p>Seleccionar los autores</p>
			<p>
			<?php $lista_autores;
			$args = array(
					'role__in' => array('author', 'administrator'),
			);
			$autores = get_users( $args );
			if ($autores) {
				foreach ( $autores as $user ) { ?>
						<input type="checkbox" name="autores[]" value="<?php echo $user->user_login; ?>" /><?php echo $user->first_name.' '.$user->last_name.' ('.$user->user_login.')'; ?><br>
				<?php }
			} ?>
			</p>
			<p>
				<input type="hidden" id="input-cursos" name="cursos">
				<input type="submit" name="submit" id="submit" class="button button-primary" value="Conectar autores">
				<button id="cancelar-asignacion" class="button button-danger">Cancelar</button>
			</p>
		</form>
	</div>
	<script>
		jQuery(function($) {
			$('.post-type-sfwd-courses .ld-tab-buttons .edit-post-header__settings').before('<a id="asignar-autores" href="#" class="is-button button components-button thickbox">Asignar autores seleccionados</a>')
			$('.post-type-sfwd-lessons .ld-tab-buttons .edit-post-header__settings').before('<a id="asignar-autores" href="#" class="is-button button components-button thickbox">Asignar autores seleccionados</a>')
			$('.post-type-sfwd-topic .ld-tab-buttons .edit-post-header__settings').before('<a id="asignar-autores" href="#" class="is-button button components-button thickbox">Asignar autores seleccionados</a>')
			
			$('body').on('click', '#asignar-autores', function(e) {
				e.preventDefault()
				if ($('.wp-list-table .check-column input:checked').length > 0) {
					var output = '';
					var ids_cursos = []
					var c = 0;
					$('.wp-list-table .check-column input:checked').each(function() {
						var id = $(this).val();
						if (id > 0) {
							c++;
							let curso = $('#post-'+id+' .row-title').text()
							output += c+'.- '+curso+'<br>';
							ids_cursos.push(id)
						}
					})
					$('#cursos-seleccionados').html(output)
					$('#input-cursos').val(ids_cursos.join(','))
					$('#asignar-autores-modal').show()
				} else {
					alert('Debes seleccionar mínimo un post')
				}
			})
			$('body').on('click', '#cancelar-asignacion', function(e) {
				e.preventDefault()
				$('#asignar-autores-modal').hide()
			})

			var select_cursos = '<div class="alignleft actions">' +
			'<label class="screen-reader-text" for="filter-by-comment-type">Filtrar por curso</label>' +
			'<select id="filter-by-comment-type" name="curso">' +
			'<option value="">Todos los cursos</option>';
			<?php $current = wp_get_current_user();
			$cursos = new WP_Query(array(
				'post_type' => 'sfwd-courses',
				'posts_per_page' => -1,
				//'author' => 'cap-'.$current->user_login
			));
			if ($cursos->have_posts()) {
				while ($cursos->have_posts()) { $cursos->the_post();
					$author = wp_get_post_terms(get_the_id(), 'author');
					$autores = wp_list_pluck($author, 'name');
					if (in_array($current->user_login, $autores)) { ?>
						select_cursos += '<option value="<?php the_ID(); ?>" <?php if(!empty($_GET['p']) && $_GET['p']==get_the_id()) echo 'selected'; ?>><?php the_title(); ?></option>';
					<?php }
				}
				wp_reset_postdata();
			} ?>
			select_cursos += '</select>' +
			'<input type="submit" name="filter_action" id="post-query-submit" class="button" value="Filtrar"></div>';
			$('.edit-comments-php #filter-by-comment-type').parent().before(select_cursos)
		})
	</script>
<?php }

add_action('admin_init', 'c7_admin_init');
function c7_admin_init() {
	if ($_POST && $_POST['submit']=='Conectar autores') {
		// print_r($_POST);die;
		$cursos = explode(',', $_POST['cursos']);
		if ($cursos) {
			foreach ($cursos as $idcurso) {
				wp_update_post(array(
					'ID' => $idcurso,
					'post_author' => $_POST['autores'][0]
				));
				wp_set_post_terms($idcurso, $_POST['autores'], 'author', false);
			}
			clean_post_cache($idcurso);
		}
	}
}

add_filter('the_comments', 'wp_filter_comments2');
function wp_filter_comments2($comments){
    global $pagenow;
		$filtrados = array();
    if($pagenow == 'edit-comments.php' && !empty($_GET['curso'])){
			$temas = new WP_Query(array(
				'post_type' => 'sfwd-lessons',
				'posts_per_page' => -1,
				'meta_key' => 'course_id',
				'meta_value' => $_GET['curso']
			));
			while ($temas->have_posts()) { $temas->the_post();
				array_push($filtrados, get_the_id());
			} wp_reset_postdata();
			$temas = new WP_Query(array(
				'post_type' => 'sfwd-topic',
				'posts_per_page' => -1,
				'meta_key' => 'course_id',
				'meta_value' => $_GET['curso']
			));
			while ($temas->have_posts()) { $temas->the_post();
				array_push($filtrados, get_the_id());
			} wp_reset_postdata();
      foreach($comments as $i => $comment){
				if(!in_array($comment->comment_post_ID, $filtrados)) {
          unset($comments[$i]);
				}
      }
    }
    return $comments;
}

add_filter( 'parse_query', 'c7_prefix_parse_filter' );
function  c7_prefix_parse_filter($query) {
   global $pagenow;
   $current_page = isset( $_GET['post_type'] ) ? $_GET['post_type'] : '';
		$current_user = wp_get_current_user();

   if ( is_admin() && 
     'sfwd-courses' == $current_page &&
     'edit.php' == $pagenow &&
		in_array( 'author', $current_user->roles )) {

			global $wpdb;
			$terms = $wpdb->get_col("SELECT r.object_id FROM {$wpdb->prefix}terms t
																	INNER JOIN {$wpdb->prefix}term_relationships r ON r.term_taxonomy_id = t.term_id
																	WHERE t.name = '".$current_user->user_login."'");

    $query->query_vars['post__in'] = $terms;
  }
}