/**
* Returns an array containing, for each field, the arary key used for that
* field in self::$_fields.
*
* @access public
* @return array
*/
static function &fieldKeys()
{
if (!self::$_fieldKeys) {
self::$_fieldKeys = array('id' => 'id', 'contact_id' => 'contact_id', 'amount' => 'amount', 'currency' => 'currency', 'frequency_unit' => 'frequency_unit', 'frequency_interval' => 'frequency_interval', 'installments' => 'installments', 'start_date' => 'start_date', 'create_date' => 'create_date', 'modified_date' => 'modified_date', 'cancel_date' => 'cancel_date', 'end_date' => 'end_date', 'processor_id' => 'processor_id', 'trxn_id' => 'trxn_id', 'invoice_id' => 'invoice_id', 'contribution_status_id' => 'contribution_status_id', 'is_test' => 'is_test', 'cycle_day' => 'cycle_day', 'next_sched_contribution_date' => 'next_sched_contribution_date', 'failure_count' => 'failure_count', 'failure_retry_date' => 'failure_retry_date', 'auto_renew' => 'auto_renew', 'payment_processor_id' => 'payment_processor_id', 'financial_type_id' => 'financial_type_id', 'payment_instrument_id' => 'payment_instrument_id', 'campaign_id' => 'contribution_campaign_id', 'is_email_receipt' => 'is_email_receipt');
}
return self::$_fieldKeys;
}
