ACF Relationship, Post Object Validation

Hello,

Thanks for the feedback, and sorry for the late answer, I was kinda busy with the latest big patch lately.

You can do that using the acfe/form_validate_form hook (see documentation), and check that the value of your Post Object doesn’t include the current post id (where the form is displayed)

add_action('acfe/form/validate_form/form=my-form', 'my_form_validation');
function my_form_validation($form){
    
    // get current post id
    // where the form is displayed
    $post_id = $form['post_id'];
    
    // get field input value (unformatted)
    $my_post_object = get_field('my_post_object', false, false);
    
    // check field value
    if($my_post_object){

        // if the Post Object allow multiple selection, use:
        //
        // if(is_array($my_post_object) && in_array($post_id, $my_post_object)){
        //     acfe_add_validation_error(...);
        // }
        //
        // if the Post Object allow a single selection, use:
        //
        // if($my_post_object === $post_id){
        //     acfe_add_validation_error(...);
        // }
        //
        
        // add validation error
        // acfe_add_validation_error('my_post_object', 'Current page cannot be selected');
        
    }
    
}

If you want to completely remove the current as being selectable in your Post Object, you can use the native acf/fields/post_object/query hook (see documentation) to excldue a post.

The equivalent also exist for the ACF Relationship field in case you need it. See documentation here.

Hope it helps!

Have a nice day!

Regards.