fix: Fixed user persistence after exchange

src/main/java/eu/ztsh/wymiana/service/UserService.java

@@ -31,7 +31,7 @@ public class UserService {
     }
 
     public User update(User user) {
-        throw new UnsupportedOperationException("Not implemented yet");
+        return UserMapper.entityToPojo(userRepository.save(UserMapper.pojoToEntity(user)));
     }
 
 }

src/main/java/eu/ztsh/wymiana/util/CurrencyMapper.java

@@ -13,11 +13,19 @@ public class CurrencyMapper {
         return new Currency(entity.getSymbol(), entity.getAmount());
     }
 
+    public static CurrencyEntity pojoToEntity(Currency pojo, String pesel) {
+        return new CurrencyEntity(pesel, pojo.symbol(), pojo.amount());
+    }
+
     public static Map<String, Currency> entitiesToPojoMap(List<CurrencyEntity> values) {
         return values.stream().map(CurrencyMapper::entityToPojo)
             .collect(Collectors.toMap(Currency::symbol, pojo -> pojo));
     }
 
+    public static List<CurrencyEntity> pojoMapToEntities(Map<String, Currency> currencies, String pesel) {
+        return currencies.values().stream().map(entry -> pojoToEntity(entry, pesel)).toList();
+    }
+
     private CurrencyMapper() {
     }
 

src/main/java/eu/ztsh/wymiana/util/UserMapper.java

@@ -14,6 +14,11 @@ public class UserMapper {
             CurrencyMapper.entitiesToPojoMap(entity.getCurrencies()));
     }
 
+    public static UserEntity pojoToEntity(User pojo) {
+        return new UserEntity(pojo.pesel(), pojo.name(), pojo.surname(),
+            CurrencyMapper.pojoMapToEntities(pojo.currencies(), pojo.pesel()));
+    }
+
     public static UserEntity requestToEntity(UserCreateRequest request) {
         return new UserEntity(request.pesel(), request.name(), request.surname(),
             List.of(new CurrencyEntity(request.pesel(), "PLN", request.pln())));