Missing if exist in validation

Hello,

Thanks for the feedback! I’m not sure to fully understand what you mean with “the value already exist”? Can you elaborate a little more? Do you have a php function documentation about that behavior?

Have a nice day!

Regards.

Hello,

Thank you for the reply. What mean is there are validation options in your great plugin. Like if x exist show y message.

But what I am missing an validation when the same value already has been used on a another post of the same field type.

Let’s say we have a field with an ean number that need to be unique in wordpress. At the moment this is not possible. (So far I know in a relative simple way)

Hello,

Well, this looks like a custom validation implementation, and I don’t think this would be something that could be integrated within the UI, because there’s so many possible conditions/parameters.

You can add your own validation using the following ACF hook: https://www.advancedcustomfields.com/resources/acf-validate_value/

Here is an implementation example, which should work in your case:

In this example we’ll validate a field named my_number and check if the value already exists in any other page Post Type:

add_filter('acf/validate_value/name=my_number', 'my_acf_number_validation', 10, 4);
function my_acf_number_validation($valid, $value, $field, $input_name){
    
    // Bail early if value is already invalid (example: required).
    if($valid !== true)
        return $valid;
    
    // Setup search to check other pages
    $args = array(
        'post_type' => 'page',
        'posts_per_page' => 1,
        'fields' => 'ids',
        'meta_query' => array(
            array(
                'key' => 'my_number',
                'compare' => '=',
                'value' => $value // input value
            )
        )
    );
    
    // Get current post ID
    $post_id = acf_maybe_get_POST('post_ID');
    
    // Exclude current post ID from the search
    if(!empty($post_id)){
        
        $args['post__not_in'] = array($post_id);
        
    }
    
    // Execute the search
    $get_posts = get_posts($args);
    
    // Search is empty. No other page is using this value
    if(empty($get_posts))
        return $valid;
    
    // Search has found something. Return an error
    $valid = 'This number is already used in an another page';
    
    return $valid;

}

Hope it helps!

Have a nice day.

Regards.

Hello,

Thank you very much, this is working like I wanted. I only changed the line:

‘key’ => ‘my_number’,

To:

‘key’ => $field,

So i only need to change the fieldname once.

Hello,

You should use $field['name'] instead, because $field is an array in this context.

have a nice day!

Regards.