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Compute the effective fiat/USD cross rate for market price offers by applying the creator's premium/discount to the market rate. Display it in the public offers list and in the trade detail amount card. The calculation lives in EffectiveRate.fiatPerUsd so it can be reused and unit tested; it returns null when the rates are unavailable, keeping the UI untouched in that case. Closes MostroP2P#750
Contributor
WalkthroughMarket-price offers now calculate a fiat-per-USD rate from fiat and USD market rates and the order premium. Offer cards and trade details display the localized rate when the calculation succeeds. Fixed-price offers do not display this rate. ChangesEffective Fiat Rate Display
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant OrderListItem
participant TradeDetailScreen
participant exchangeRateProvider
participant EffectiveRate
participant effectiveRateUsd
OrderListItem->>exchangeRateProvider: Read fiat and USD rates
exchangeRateProvider-->>OrderListItem: Return available rates
OrderListItem->>EffectiveRate: Calculate rate with premium
EffectiveRate-->>OrderListItem: Return rate or null
OrderListItem->>effectiveRateUsd: Format available rate
TradeDetailScreen->>exchangeRateProvider: Read fiat and USD rates
exchangeRateProvider-->>TradeDetailScreen: Return available rates
TradeDetailScreen->>EffectiveRate: Calculate rate with premium
EffectiveRate-->>TradeDetailScreen: Return rate or null
TradeDetailScreen->>effectiveRateUsd: Format available rate
Suggested reviewers: Merge Risk: 🟡 Moderate · up to If an exchange-rate request fails, the offers list or trade detail can fail to render. The new rate also does not use local number formatting. Fix the error-safe rate reads and the formatting before merging. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Linked Issues check |  |
Issue #750 requires existing locale-aware number formatting. The new UI code formats the rate with rate.toStringAsFixed(2) in order_list_item.dart and trade_detail_screen.dart. This uses a dot d… |
Format the effective rate with the existing locale-aware NumberFormat before passing it to effectiveRateUsd. Add a focused test for locale-sensitive output if the formatting logic is extracted. |
✅ Passed checks (4 passed)
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Check name Status Explanation Out of Scope Changes check The changes add the requested effective-rate helper, its unit tests, the two issue-specified displays, and translations for the new label. The exchange-rate provider usage and localization changes sup… Docstring Coverage No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: showing the effective fiat/USD rate for market-price offers.
Full details: Linked Issues check
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Explanation
Issue
#750requires existing locale-aware number formatting. The new UI code formats the rate withrate.toStringAsFixed(2)inorder_list_item.dartandtrade_detail_screen.dart. This uses a dot decimal separator and does not apply locale-specific grouping. The implementation does satisfy the main display, market-price filtering, missing-rate handling, currency support, rate reuse, and formula requirements. The helper tests cover the requested calculation cases.
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A rabbit checks the market rates,
And nibbles numbers, small and neat.
A premium shifts the value shown,
In every tongue, the rates are known.
Then off I hop on velvet feet.
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Actionable comments posted: 4
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Inline comments:
Review comments at @lib/features/home/widgets/order_list_item.dart:
- Around line 28-29: Move the fiat and USD `exchangeRateProvider` watches in the
order list item into the market-price path, so fixed-price cards do not create
rate providers or trigger `fetchExchangeRate` requests.
- Around line 49-50: Update the optional rate reads in
lib/features/home/widgets/order_list_item.dart at lines 49-50 and
lib/features/trades/screens/trade_detail_screen.dart at lines 153-154 to avoid
AsyncValue.value rethrowing provider errors when no previous value exists. Use
an error-safe read in both locations and omit each rate when unavailable, so
failed rate fetches do not prevent the offer card or trade detail from building.
- Line 56: Use one shared locale-aware rate formatter with sufficient
significant digits to preserve positive rates below 0.005. Update the rate
formatting at lib/features/home/widgets/order_list_item.dart:56 and reuse the
same formatter at lib/features/trades/screens/trade_detail_screen.dart:158 so
both displays use the active locale and show consistent rates.
Review comments at @lib/shared/utils/effective_rate.dart:
- Around line 21-24: Update the effective-rate calculation to reject non-finite
inputs and intermediate or final results before returning a rate, while
preserving the existing positive-rate checks. Add tests covering non-finite
premiums and the resulting rate boundary.
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📒 Files selected for processing (11)
lib/features/home/widgets/order_list_item.dartlib/features/trades/screens/trade_detail_screen.dartlib/l10n/intl_de.arblib/l10n/intl_en.arblib/l10n/intl_es.arblib/l10n/intl_fr.arblib/l10n/intl_it.arblib/l10n/intl_nl.arblib/l10n/intl_pt.arblib/shared/utils/effective_rate.darttest/shared/utils/effective_rate_test.dart
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Drop the trade detail change; the rate is shown only in the public offers list.
- watch exchange rates only for market price orders so fixed price cards do not create providers or trigger fetches - read cached rates with asData?.value so a failed fetch cannot throw while building the card - format the rate with the active locale and enough significant digits instead of toStringAsFixed - reject non-finite inputs and results in EffectiveRate.fiatPerUsd - cover the new boundaries and formatting in the unit tests
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Closes #750
Problem
When browsing P2P offers, users see the fiat amount (e.g. 1000 CUP) and the premium/discount for each offer, but not the effective fiat/fiat exchange rate that the offer actually represents. Comparing offers means mentally applying the premium every time.
Change
Compute the effective fiat/USD cross rate for market price offers by applying the creator's premium/discount to the market rate:
The value is shown in the public offers list (
lib/features/home/widgets/order_list_item.dart), under the market price row, for every market price offer (0%, premium, or discount). This is where users compare offers at a glance, so it is not repeated on the take-order or trade detail screens.It works for any fiat currency. When the cross rate cannot be computed (missing, non-positive, or non-finite rates), nothing is displayed and the UI is left untouched. Fixed price offers are unaffected, and their cards do not subscribe to rate providers.
The calculation and formatting live in
EffectiveRate(lib/shared/utils/effective_rate.dart) so they can be reused and unit tested.Internationalization
A new key
effectiveRateUsdwas added to all seven locales (en, es, de, fr, it, nl, pt). The rate is formatted with the active locale (NumberFormat) keeping up to six fraction digits so small rates are not rounded to zero.Tests
test/shared/utils/effective_rate_test.dartcovers:How I verified
Built an arm64-v8a debug APK from CI: the value shows in the offers list and is correct across currencies.
flutter gen-l10nruns with no untranslated messages.Notes
The reference currency is USD for now; a user-preferred reference could be a follow-up.