Copilot GPT with Tuning #11
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Pull Request Overview
This PR implements a comprehensive wallet and transaction system backend, adding new database models, API endpoints, and business logic for multi-currency wallet management. The implementation supports user wallet creation with currency-specific balances, transaction processing with cross-currency conversion and fee handling, and proper data validation.
- Introduces Wallet and Transaction database models with proper relationships and constraints
- Implements wallet management API endpoints for creation, retrieval, and transaction processing
- Adds support for USD, EUR, and RUB currencies with fixed exchange rates and cross-currency fees
Reviewed Changes
Copilot reviewed 10 out of 12 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| backend/app/models/wallet_models.py | Defines API models for wallet and transaction operations |
| backend/app/models/db_models.py | Adds Wallet and Transaction database table models with relationships |
| backend/app/constants.py | Defines currency enums, exchange rates, and wallet-specific constants |
| backend/app/api/routes/wallets.py | Implements wallet management endpoints with business logic |
| backend/app/api/main.py | Registers wallet router in the main API configuration |
| backend/app/alembic/versions/7b2a1c4e3f10_add_wallet_and_transaction_models.py | Database migration for wallet and transaction tables |
| backend/app/models/init.py | Exports new wallet and transaction models |
| detailed_issues.csv | Shows code quality tool findings for the new implementation |
| code_quality_summary.csv | Updated summary of code quality metrics |
| .github/instructions/general.instructions.md | New development guidelines and coding standards |
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| # Apply cross-currency fee on the converted amount | ||
| if is_cross and CROSS_CURRENCY_FEE_RATE > 0: | ||
| fee_amount = _quantize(converted_amount * CROSS_CURRENCY_FEE_RATE) | ||
| net_amount = _quantize(converted_amount - fee_amount) |
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Cross-currency fees are only applied to credit transactions, but the business logic should apply fees to both credit and debit transactions when currencies differ. Currently, debit transactions in different currencies avoid fees entirely.
| net_amount = _quantize(converted_amount - fee_amount) | |
| if tx_in.type == TransactionType.CREDIT: | |
| net_amount = _quantize(converted_amount - fee_amount) | |
| else: # DEBIT | |
| net_amount = _quantize(converted_amount + fee_amount) |
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| wallet_id=wallet.id, | ||
| amount=_quantize(tx_in.amount), # store original amount | ||
| type=tx_in.type, | ||
| currency=tx_in.currency, |
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Storing only the original transaction amount loses important audit information. Consider storing both the original amount and the converted amount (with fees) for better transaction tracking and reconciliation.
| currency=tx_in.currency, | |
| currency=tx_in.currency, | |
| converted_amount=net_amount, # store converted/net amount in wallet currency | |
| converted_currency=wallet.currency, # store wallet currency | |
| fee_amount=fee_amount if is_cross and CROSS_CURRENCY_FEE_RATE > 0 else Decimal("0.00"), # store fee if any |
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| ExchangeKey: TypeAlias = tuple[Currency, Currency] | ||
| ExchangeRatesMap: TypeAlias = dict[ExchangeKey, Decimal] | ||
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| EXCHANGE_RATES: Final[ExchangeRatesMap] = { |
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The hardcoded exchange rates create a maintenance burden and potential inconsistency issues. The rates should be stored in a database table or configuration service to allow updates without code deployment.
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Created a backend endpoints which implements following functionality: - Introduced a new entity Wallet and Transaction. - Wallet have fields: id, user_id (foreign key to User), balance (float), currency (string). - Available currencies: USD, EUR, RUB. - Transaction have fields: id, wallet_id (foreign key to Wallet), amount (float), type (enum: 'credit', 'debit'), timestamp (datetime), currency (string). - Implemented endpoint to create a wallet for a user. - Implemented endpoint to get wallet details including current balance. - Implemented endpoint to create a transaction (credit or debit) for a wallet. # Rules for wallet - A user can have three wallets. - Wallet balance should start at 0.0. - Arithmetic operations on balance should be precise up to two decimal places. # Rules for transaction - For 'credit' transactions, the amount should be added to the wallet balance. - For 'debit' transactions, the amount should be subtracted from the wallet balance. - Ensure that the wallet balance cannot go negative. If a debit transaction would cause the balance to go negative, the transaction should be rejected with an appropriate error message. - Transaction between wallets with different currencies must be converted using a fixed exchange rate (you can hardcode some exchange rates for simplicity) and fees should be applied. Duration:14m28s My own comments: + Created migration - A little mess in models now
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Implemented backend task
Created a backend endpoints which implements following functionality:
Rules for wallet
Rules for transaction
Duration:14m28s
My own comments: