Drupal: Open Atrium alter Message Notification type

Recently I needed to send Created message instead of Updated when editors publish node in Open Atrium. This is how you can simply alter message type, which is subsequently passed into oa_messages_create function and correctly picks up the correct Message type and all it’s arguments:

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function my_module_oa_messages_type_alter(&$message_type, &$context) {
  if (isset($context['entity'])) {
    // Change notification type to "created" when publishing content.
    if (isset($entity->original)) {
      if ($entity->original->status == 0 && $entity->status == 1) {
        $message_type = 'oa_create';
        // Set the context uid as oa_create uses entity autor uid
        // instead of current user uid
        $context['uid'] = $entity->uid;
      }
    }
  }
}