def get_rates(currencies):
sources = []
targets = []
if CACHE_ENABLED:
rate_map = get_rates_cached(currencies)
for (source, target), rate in rate_map.items():
if not rate:
sources.append(source)
targets.append(target)
else:
rate_map = {c: None for c in currencies}
sources = map(itemgetter(0), currencies)
targets = map(itemgetter(1), currencies)
rates = ExchangeRate.objects.filter(
source__code__in=sources,
target__code__in=targets).values_list(
'source__code',
'target__code',
'rate')
for source, target, rate in rates:
key = (source, target)
# Some other combinations that are not in currencies originally
# may have been fetched from the query
if key in rate_map:
rate_map[key] = rate
return rate_map
def convert_values(args_list):
value_map = {}
rate_map = {}
conversions = {args[1:3] for args in args_list}
if CACHE_ENABLED:
rate_map = get_rates_cached(conversions)
for args in args_list:
conversion = args[1:3]
rate = rate_map.get(conversion)
if not rate:
rate = ExchangeRate.objects.get_rate(conversion[1], conversion[2])
value_map[args] = rate
return value_map
def get_rates(currencies):
sources = []
targets = []
if CACHE_ENABLED:
rate_map = get_rates_cached(currencies)
for (source, target), rate in rate_map.items():
if not rate:
sources.append(source)
targets.append(target)
else:
rate_map = {c: None for c in currencies}
sources = map(itemgetter(0), currencies)
targets = map(itemgetter(1), currencies)
rates = ExchangeRate.objects.filter(source__code__in=sources,
target__code__in=targets).values_list(
'source__code', 'target__code',
'rate')
for source, target, rate in rates:
key = (source, target)
# Some other combinations that are not in currencies originally
# may have been fetched from the query
if key in rate_map:
rate_map[key] = rate
return rate_map
