Default WP Gallery – show only galleries of a certain category

I am using WordPress’s default Gallery and adding categories to them. I now created a shortcode with a loop to get the Galleries to a page:

if(! function_exists('test_shortcode')){
function lv_gallery_style_one_shortcode($atts, $content = null){
    extract(shortcode_atts( array(
        'title'=>'',
        ), $atts) );

        $port=array('post_type' => 'gallery', 'category_name' => 'beach', 'showposts' => -1 );
        $loop=new WP_Query($port);
        while ( $loop->have_posts() ) : $loop->the_post(); 

        // HERE IS THE LOOP

        return $html;
}
add_shortcode('gallery_test', 'test_shortcode' );

I know that the loop worked just fine because when I remove 'category_name' => 'beach' it displays all the categories.

—————EDIT:—————–

The Gallery I am using has the following icon and option:

I thought this is the standard WP gallery, am I wrong?

When I create a new Gallery, there is a Category section on the right side:

What is this used for if I cannot use them? I don’t understand.

—————End EDIT:————-

This is just an example code. In the complete version, the category name will be a parameter to enter in the shortcode, that is why I would like to do it like this.

Any ideas on how to get this to work?

Any suggestions are appreciated :).

Thanks.

What I suspect is that those Gallery Categories are not the category taxonomy. They are probably a registered taxonomy, registered by the same script which added the gallery post type.

To find out, click on the Gallery Categories ( in the provided image ) and you will be redirected to a URL such as this:

http://example.com/wp-admin/edit-tags.php?taxonomy=my-taxonomy&post_type=gallery

Check the taxonomy argument. If it is anything other than category, then you are on a custom taxonomy, and you need to add a tax_query to your WP_Query. Here’s how to do it:

Your args would simply change from this:

$port=array('post_type' => 'gallery', 'category_name' => 'beach', 'showposts' => -1 );

To this:

$port = array(
     'post_type' => 'gallery', 
     'showposts' => -1,
     'tax_query' => array (
          array(
              'taxonomy' => 'my-taxonomy',
              'field'    => 'slug',
              'terms'    => 'beach',
          )
     )
);

Side Note:

Make sure you use wp_reset_postdata(); just before the return $html;. This will reset the query and makes sure your shortcode won’t affect any other queries in the page.

All done.