Interacting with external modules

Hi,

I am co-maintainer of Drupal Project Managment (Drupal PM) and related PM Invoice module.

The 7.x-1.x version of Drupal PM uses its own invoicing entity. We have decided to stop doing that and reuse Invoice. This would reduce duplication of effort. For this we are providing a connector module which would provide rules and action integration with various invoicing module. You can read about the discussion here #2342329: Future of PM Invoice module.

In order to accomplish this,

We would need a clean api to create invoice, organization and items programmatically. Using REST API to create invoices (#1997320: How to create an invoice trough rest api in php or other method from my custom module?) in the same system seems to be a hacky solution.

Am attaching a patch to help visualize the changes required.

Once the patch is applied i could call the function from my module to add an item to the invoice.

<?php
    $invoice = node_load(123); // load the invoice node.
    $active_template = $invoice->invoice['template'];
    $item = array(
      "iid" => NULL,
      "invoice_number" => $invoice->invoice['invoice_number'],
      "description" => 'Some description of item',
      "quantity" => '1',
      "price_without_vat" => '100',
      "price_with_vat" => "",
      "vat" => _invoice_get_variable($active_template, 'vat'),
    );
    invoice_controller_save_item($item);
?php>

Is it feasible?

I am ready to provide similar patches if required.