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Filtering custom posts by post object field

  • Hello, I’m working on a website where I registered 2 custom post types : artist and release. I’ve created a bi-directional post object field : related. I’ve also added custom columns for each post type.

    Custom fields for the post type artist :
    Custom fields for artists

    Custom fields for the post type release :
    Custom fields for releases

    Artist admin page :
    Artist admin page

    Release admin page :
    Release admin page

    I’ve managed to filter artists by the column “Origin”

    Here is the code I used to filter the artists by origin :

    function meta_key_filter( $query ) {
    
    		if( isset( $_GET['post_type'] ) ) {
    			$post_type = $_GET['post_type'];
    		}
    
    		if( $query->is_admin && isset( $_GET['origin'] ) && $post_type === 'artist' ) {
    			$origin = $_GET['origin'];
    			$meta_key_query = array(
    				array(
    					'key' => 'origin',
    					'value' => $origin,
    					'compare' => 'LIKE',
    				)
    			);
    			$query->set( 'meta_query', $meta_key_query );
    		}
    		return $query;
    
     }
    }
    add_action( 'pre_get_posts', 'meta_key_filter' );

    What I’d like to achieve is filtering releases by the column “Artist” but I can’t figure out to do so.

    Any advise?

  • I’m facing the exact same issue of not being able to filter by ANY custom post type. Have you figured anything out in relation to this that you’d like to share?

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