How to assign filter-category automatically

Assigning of filter-category automatically (by code in your site) to any post type is necessary when for example a lot of posts should be added by users for example, or by any another reason. For this should be used WordPress hook save_post https://codex.wordpress.org/Plugin_API/Action_Reference/save_post

Here is an example how to realize it:

open functions.php file of your site current wp theme and drop there next code:

function save_mdtf_meta( $post_id, $post, $update ) {

    /*
     * In production code, $slug should be set only once in the plugin,
     * preferably as a class property, rather than in each function that needs it.
     */
    $post_type = 'book';

    // If this isn't a 'book' post, don't update it.
    if ( $post_type != $post->post_type ) {
        return;
    }

    // - Update the post's metadata.

   update_post_meta( $post_id, 'meta_data_filter_cat', 77 );
}
add_action( 'save_post', 'save_mdtf_meta', 10, 3 );

function save_mdtf_meta( $post_id, $post, $update ) {

* In production code, $slug should be set only once in the plugin,

* preferably as a class property, rather than in each function that needs it.

$post_type = 'book';

// If this isn't a 'book' post, don't update it.

if ( $post_type != $post->post_type ) {

return;

}

// - Update the post's metadata.

update_post_meta( $post_id, 'meta_data_filter_cat', 77 );

}

add_action( 'save_post', 'save_mdtf_meta', 10, 3 );

77 here is an example ID of filter-category, and you should write it there correct, test it after the code installation
post_type - if you need this operation for only one post-slug. Comment or remove 'return' in 'if ( $post_type != $post->post_type )' condition

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