FuelPHP Forums

I am trying to bulk update a table full of Related items on an invoice.
I am pushing a json array of objects that have all of the $_properties the Model expects.

My Controller method looks like this:

public function update_items($invoice_id)
{
    $invoice = Model_Invoice::find($invoice_id);

    if ($items = MyInput::json())
    {
        $invoice->from_array(array('invoice_items' => $items));
    }

    $invoice->save();
}

This gives a PK Collision error when saving the Related objects (invoice_items).
This is because the objects that have been updated in the $invoice->invoice_items are all is_new() == true.

How should I be structuring this code? I don't want to have to manage add/edit/delete states for every incoming related item.