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Hi Michele and David,

Thanks a lot for your inputs. The inconsistent and unclear of information from Google is a big concern to us.

I'll check the OSM next week and will try to provide a quick workaround.

Sorry, can you try again now?

Hi again,

We've just updated the extension with able to save NULL value to the table. Now if the value is an empty string or empty array, it will be saved as NULL. Please update the extension and let us know how it goes.

Thanks for letting us know. Let me check and fix it.

Sorry, the docs is incorrect. The submitted post ID is added separately as the 2nd parameter of the hook. Please change the code to this:

add_action ('rwmb_frontend_after_process','emnsh_rwmb_frontend_after_process', 10, 2);
function emnsh_rwmb_frontend_after_process($config, $post_id) {
    if ($post_id') {
        $name = rwmb_meta('emnsh-name');
        wp_update_post(array(
            'ID' =>  $config['post_id'],
            'post_title'=>$name
        ));
    }
}

I also updated the docs.

This code:

$birra = isset( $passaggio['et2018-nome_birra'] ) ? $passaggio['et2018-nome_birra'] : '<a href="'.get_the_permalink().'" title="'.get_the_title().'"><p>Birra: '.$birra.'</p></a>';

is wrong and can't work.

This code:

if (isset($passaggio['et2018-nome_birra'])){
                    $birra = $passaggio['et2018-nome_birra'];
                }
echo '<a href="'.get_the_permalink().'" title="'.get_the_title().'"><p>Birra: '.$birra.'</p></a>';

works. But it will show a warning if there is no value for $passaggio['et2018-nome_birra']. And in case there's no value, it still show the <a> link.

Please try this instead:

$birra = isset($passaggio['et2018-nome_birra']) ? $passaggio['et2018-nome_birra'] : '';
if ($birra) {
    echo '<a href="'.get_the_permalink().'" title="'.get_the_title().'"><p>Birra: '.$birra.'</p></a>';
}

I think it's better to check like this:

$birra = isset( $passaggio['et2018-nome_birra'] ) ? $passaggio['et2018-nome_birra'] : '';

So the variable is always available and won't display any warning if you do echo $birra;.

PS: You can get the group value your way or use the helper function like this:

$passaggio = rwmb_meta( 'gruppo_birra' );

In your code, please make sure the global $post is available. Otherwise it won't work. You can try this instead:

$passaggio = get_post_meta( get_the_ID(), 'gruppo_birra', true );

Hi,

The filter:

$new = apply_filters( "rwmb_{$field['id']}_value", $new, $field, $old );

means that the value of the field ($new) will run through a filter called rwmb_YOURFIELDID_value. This filter has 3 params:

• $new: the submitted value of the field
• $field: field settings (array)
• $old: the current value of the field, which is stored in the custom field. If field is new, then it's an empty string.

So, to add a filter to change the field value, please run:

add_filter( 'rwmb_YOURFIELDID_value', function( $new, $field, $old ) {
    $new = 'Your new value';
    return $new;
}, 10, 3 );

Just add it to your functions.php file of your theme. That's all.

Hope that's clear 🙂