/**
* Turn the currencyCode exchange rate collection into a JSON structure.
*
* Format:
*
* {
* "rates": {
* "EUR": {
* "rate": "0.706700000000",
* "price_currency_code": "EUR"
* }
* },
* "valid_until": "2015-02-27T12:00:00Z"
* }
*
* @return string the JSON structure.
* @throws NostoException of the rate collection is empty.
*/
protected function getCollectionAsJson()
{
$data = array('rates' => array(), 'valid_until' => null);
/** @var NostoExchangeRate $item */
foreach ($this->collection as $item) {
$data['rates'][$item->getName()] = array('rate' => $item->getExchangeRate(), 'price_currency_code' => $item->getCurrencyCode());
}
if (empty($data['rates'])) {
Nosto::throwException(sprintf('Failed to update currencyCode exchange rates for account %s. No rates found in collection.', $this->account->getName()));
}
return json_encode($data);
}
