Get all products with a custom attribute

by

You have written key as meta_value. It should be your meta name. The name you have given to your custom fields or meta. Then use the following query.

$args = array ( 
         'post_type'  => 'your-post-type',
         'posts_per_page'  => -1,
         'meta_query' => array( 
             array( 
              'key' => 'demo', 
              'value' => '',
              'compare' => '!='
             ), 
           ), 
   );

By default the compare is set to =

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