Auto-create title/slug from invoice number?

== SOLVED ==

By digging into the original Sliced Invoices code, I have found how the _next_invoice_number was being called. I copied that and here is the result:

// Modify the invoice title & slug on "publish" or "update"
function modify_sliced_invoice_title($data, $postarr) {
    $post = get_post();
    if( $post->post_type === 'sliced_invoice') {
        if( $post->post_status !== 'publish' ) {
            $option = get_option( 'sliced_invoices' );
            $number = $option['number'];
        }
	else {
	    $number = get_post_meta( get_the_ID(), '_sliced_invoice_number', true);
	}
	$title 	= 'Invoice ' .$number;
	$slug 	= 'invoice-' .$number;

	if( $post->post_title === $title ) {
	    $data['post_title'] = $data['post_title'];
	    $data['post_name']  = $data['post_name'];
	}
	else {
	    $data['post_title'] = $title;
	    $data['post_name'] = sanitize_title($slug);
	}
    }
    return $data;
}
add_filter( 'wp_insert_post_data', 'modify_sliced_invoice_title', '99', 2 );

Now all all invoices wil be automatically named “Invoice [number]” and their slug is “invoice-[number]”, no matter how they were created (front- or back-end). It even checks for this if you update an existing invoice. ??

• This reply was modified 6 years, 7 months ago by Stonehenge Creations.
• This reply was modified 6 years, 7 months ago by Stonehenge Creations.

Hi Patrick,

Thanks for updating! We were looking into this for you but you were too fast for us.:)

Hi Andrea,

Yes, I had just finished testing it and immediately updated this thread. ??

Where does that code go?

You can put it in your functions.php or make a simple plugin out of it.

I am currently creating a plugin that will automatically create a new invoice when the visitor fills out a caldera form. ??