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feat(automatic-exchange-rates): add "Single exchange rate" where only one exchange rate is added and updated to avoid db clutter

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Herculino Trotta
2025-08-07 23:25:51 -03:00
parent 2f33b5989f
commit 540235c1b0
4 changed files with 89 additions and 12 deletions
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app/apps/currencies/exchange_rates/fetcher.py
+54 -12
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@@ -203,21 +203,63 @@ class ExchangeRateFetcher:
if provider.rates_inverted:
# If rates are inverted, we need to swap currencies
ExchangeRate.objects.create(
from_currency=to_currency,
to_currency=from_currency,
rate=rate,
date=timezone.now(),
)
if service.singleton:
# Try to get the last automatically created exchange rate
exchange_rate = (
ExchangeRate.objects.filter(
automatic=True,
from_currency=to_currency,
to_currency=from_currency,
)
.order_by("-date")
.first()
)
else:
exchange_rate = None
if not exchange_rate:
ExchangeRate.objects.create(
automatic=True,
from_currency=to_currency,
to_currency=from_currency,
rate=rate,
date=timezone.now(),
)
else:
exchange_rate.rate = rate
exchange_rate.date = timezone.now()
exchange_rate.save()
processed_pairs.add((to_currency.id, from_currency.id))
else:
# If rates are not inverted, we can use them as is
ExchangeRate.objects.create(
from_currency=from_currency,
to_currency=to_currency,
rate=rate,
date=timezone.now(),
)
if service.singleton:
# Try to get the last automatically created exchange rate
exchange_rate = (
ExchangeRate.objects.filter(
automatic=True,
from_currency=from_currency,
to_currency=to_currency,
)
.order_by("-date")
.first()
)
else:
exchange_rate = None
if not exchange_rate:
ExchangeRate.objects.create(
automatic=True,
from_currency=from_currency,
to_currency=to_currency,
rate=rate,
date=timezone.now(),
)
else:
exchange_rate.rate = rate
exchange_rate.date = timezone.now()
exchange_rate.save()
processed_pairs.add((from_currency.id, to_currency.id))
service.last_fetch = timezone.now()