/**
* Returns an array containing, for each field, the arary key used for that
* field in self::$_fields.
*
* @return array
*/
static function &fieldKeys()
{
if (!self::$_fieldKeys) {
self::$_fieldKeys = array('id' => 'activity_id', 'source_record_id' => 'source_record_id', 'activity_type_id' => 'activity_type_id', 'subject' => 'activity_subject', 'activity_date_time' => 'activity_date_time', 'duration' => 'activity_duration', 'location' => 'activity_location', 'phone_id' => 'phone_id', 'phone_number' => 'phone_number', 'details' => 'activity_details', 'status_id' => 'activity_status_id', 'priority_id' => 'priority_id', 'parent_id' => 'parent_id', 'is_test' => 'activity_is_test', 'medium_id' => 'activity_medium_id', 'is_auto' => 'is_auto', 'relationship_id' => 'relationship_id', 'is_current_revision' => 'is_current_revision', 'original_id' => 'original_id', 'result' => 'activity_result', 'is_deleted' => 'activity_is_deleted', 'campaign_id' => 'activity_campaign_id', 'engagement_level' => 'activity_engagement_level', 'weight' => 'weight');
}
return self::$_fieldKeys;
}