EmailAttachment::prepareQuery

public function prepareQuery($entityGroupField = array())
{
	$this->activityFiles = new Volume\Activity();
	$this->activityFiles->setFilter($this->getFilter());

	$query = $this->activityFiles->getActivityFileMeasureQuery(Volume\Activity::className(), $entityGroupField);

	// only email attachments
	$query->where('TYPE_ID', '=', \CCrmActivityType::Email);

	return $query;
}