Using get_field_object to create custom filters in wp-admin

• mastafu

• March 5, 2023 at 5:39 pm

Hi,

I want to add custom filters to my podcasts post type in wp-admin.

It almost works 🙂
The problem is that after selecting a value in one of these fields, the filter disappears, and get_field_object returns null.

Any idea why ? I tried to use get_the_id and so on, but still no luck.

// Add custom filters to the podcast post type
function custom_podcast_filters() {
  global $typenow;
  
  if ($typenow === 'podcast') {
    
    $podcast_home_switch = get_field_object('podcast_home_switch',get_the_ID());
    $podcast_recommended_switch = get_field_object('podcast_recommended_switch',get_the_ID());
    $podcast_popular_switch = get_field_object('podcast_popular_switch',get_the_ID());
    $wp_author_id = get_field_object('wp_author_id',get_the_ID());
    $wp_program_id = get_field_object('wp_program_id',get_the_ID());

    var_dump($podcast_home_switch);

    // Filter by podcast_home_switch
    if ($podcast_home_switch) {
      $selected_podcast_home_switch = isset($_GET['podcast_home_switch']) ? $_GET['podcast_home_switch'] : '';
      echo '<select name="podcast_home_switch">';
      echo '<option value="">Filtruj - Na głównej</option>';
      echo '<option value="true" ' . selected($selected_podcast_home_switch, 'true', false) . '>Tak</option>';
      echo '<option value="false" ' . selected($selected_podcast_home_switch, 'false', false) . '>Nie</option>';
      echo '</select>';
    }

    // Filter by podcast_recommended_switch
    if ($podcast_recommended_switch) {
      $selected_podcast_recommended_switch = isset($_GET['podcast_recommended_switch']) ? $_GET['podcast_recommended_switch'] : '';
      echo '<select name="podcast_recommended_switch">';
      echo '<option value="">Filtruj - Polecany</option>';
      echo '<option value="true" ' . selected($selected_podcast_recommended_switch, 'true', false) . '>Tak</option>';
      echo '<option value="false" ' . selected($selected_podcast_recommended_switch, 'false', false) . '>Nie</option>';
      echo '</select>';
    }

    // Filter by podcast_popular_switch
    if ($podcast_popular_switch) {
      $selected_podcast_popular_switch = isset($_GET['podcast_popular_switch']) ? $_GET['podcast_popular_switch'] : '';
      echo '<select name="podcast_popular_switch">';
      echo '<option value="">Filtruj - popularny</option>';
      echo '<option value="true" ' . selected($selected_podcast_popular_switch, 'true', false) . '>Tak</option>';
      echo '<option value="false" ' . selected($selected_podcast_popular_switch, 'false', false) . '>Nie</option>';
      echo '</select>';
    }

    // Filter by wp_author_id
    if ($wp_author_id) {
      $selected_author_id = isset($_GET['wp_author_id']) ? $_GET['wp_author_id'] : '';
      echo '<select name="wp_author_id">';
      echo '<option value="">Filtruj - autorzy</option>';
      $authors = get_posts(array(
        'post_type' => 'zespol',
        'numberposts' => -1,
        'post_status'    => 'publish',
        'meta_key'      => 'team_sort_id',
        'meta_type' => 'NUMERIC',
        'orderby'      => 'meta_value_num',
        'order' => 'ASC',
        'meta_query' => array(
            array(
                'key' => 'podcaster_switch',
                'value'     => '1',
                'compare'   => '=='
            )
        ),
      ));

      foreach ($authors as $author) {
        $author_id = $author->ID;
        $author_name = $author->post_title;
        echo '<option value="' . $author_id . '" ' . selected($selected_author_id, $author_id, false) . '>' . $author_name . '</option>';
      }
      echo '</select>';
    }

    // Filter by wp_program_id
    if ($wp_program_id) {
         $selected_program_id = isset($_GET['wp_program_id']) ? $_GET['wp_program_id'] : '';
        echo '<select name="wp_program_id">';
        echo '<option value="">Filtruj - audycje</option>';
        $programs = get_posts(array(
        'post_type' => 'audycja',
        'numberposts' => -1,
        'post_status'    => 'publish',
        'meta_key'      => 'program_sort_ids',
        'meta_type' => 'NUMERIC',
        'orderby'      => 'meta_value_num',
        'order'        => 'ASC',
        ));
        foreach ($programs as $program) {
            $program_id = $program->ID;
            $program_name = $program->post_title;
            echo '<option value="' . $program_id . '" ' . selected($selected_program_id, $program_id, false) . '>' . $program_name . '</option>';
        }
            echo '</select>';
        }   
    }
}
add_action('restrict_manage_posts', 'custom_podcast_filters');